Plus One

Kerala State Board New Syllabus Plus One Accountancy Chapter Wise Previous Questions and Answers Chapter 2 Theory Base of Accounting.

Kerala Plus One Accountancy Chapter Wise Previous Questions and Answers Chapter 2 Theory Base of Accounting

Question 1.
Closing stock is valued at _______ (March 2010)
a) Cost price
b) Market price
c) Cost price or market price whichever is lower.
d) replacement cost
Answer:
c) Cost price or market price whichever is lower.

Question 2.
Assets are shown at cost less depreciation due to the following principles. (March 2010)
a) Realization
b) Going concern
c) Duality
d) Dissolution
Answer:
b) Going concern

Question 3.
Revenue from the sale of products ordinarily is reported as part of the earning in the period when _________ (March 2010)
a) the sale is made
b) the cash is collected
c) the products are manufactured
Answer:
a) the sale is made

Question 4.
In double-entry book-keeping, every transaction has two aspects. (March 2010)
Answer:
True

Question 5.
The _____ concept makes a distinction between a business and its proprietor. (March 2011)
a) business entity
b) consistency
c) going concerned
d) accounting entity
Answer:
d) accounting entity

Question 6.
Assets are always equal to capital plus ________ (March 2011)
Answer:
Liabilities

Question 7.
Revenue is generally recognised being earned at, when ________ (March 2011)
a) cash is received
b) goods are delivered
c) sale is effected
Answer:
c) Sales is effected

Question 8.
According to the _______ principle, frequent changes in accounting policies adversely affect the reliability of financial information. (March 2011)
Answer:
Consistency principle

Question 9.
State whether the following is “true” or “false”. If false, correct the same. (March 2011)
It is on the basis of the going concern concept, that assets are valued at market price.
Answer:
False, It is on the basis of the going concern concept, the business has an indefinite life.

Question 10.
Excess of assets over liability is _________ (March 2012)
a) fixed assets
b) current assets
c) capital
d) drawings
Answer:
c) capital

Question 11.
Accounting Standards-2 (AS2) deals with ________ (March 2012)
a) depreciation accounting
b) revenue recognition.
c) valuation of inventory
d) accounting for fixed assets
Answer:
c) valuation of inventory

Question 12.
Debit Means _______ (March 2012)
Answer:
Receiving aspects of a transaction

Question 13.
Enumerate four different forms of the accounting equation. (March 2012)
Answer:
Accounting Equation
Assets = Equities
The properties owned by a business are called assets, the right to the properties are called equities. Equities may be creditors’ equity or owners’ equity. Equities of creditors being debts of the business are called liabilities. The equity of owners is called capital or owners equity.
Therefore, Assets = Liabilities + Capital i.e., A = L + C
Capital = Assets – Liabilities i.e., C = A – L
Liabilities = Assets – Capital i.e., L = A – C
Assets – Capital – Liabilities = Zero i.e, A – C – L = Zero

Question 14.
Identify the accounting principles or concepts involved in the following: (March 2012)
a) Mr. Sreenath, owner of the business, invested Rs. 10,000 in his business. He is treated as a creditor of the business to the extent of Rs. 10,000 and his capital account is credited with the amount.
b) All transactions recorded in the books of accounts must have a supporting document in evidence of it.
c) Closing stock is valued at cost price or market price whichever is less.
Answer:
a) Business Entity/Accounting Entity Assumption
b) Verifiability/Objectivity Principle
c) Prudence/Conservatism Principle

Question 15.
Briefly explain any four of the modifying principles of accounting. (March 2012)
Answer:
There are certain general conventions or principles which supplement the basic principles for the preparation of accounting records and financial statements. They are called modifying conventions or principles.
The important modifying principles are:
a. Cost-Benefit
b. Materiality
c. Consistency
d. Prudence or conservatism
e. Timeliness
f. Substance over legal form
g. Variation in accounting practices.

a. Cost-Benefit Principle: This principle is a generally accepted norm that the cost of doing anything must not exceed the possible benefit that may be derived. This is applicable in the case of accounting also. Money spent for undertaking accounting work should definitely provide more benefit than the cost incurred.

b. Materiality Principle: Materiality means relevance or importance or significance. As per this principle, all material facts should be disclosed in the financial statements, but insignificant and immaterial facts need not be disclosed in detail. For example, purchase of items like pen, pencil, scissors etc. are to be recorded as assets but practically these items are treated as expenses under the head stationary.

c. Consistency Principle: Consistency means steadiness or unchanging nature. Accounting policies and practices adopted must be consistent for a relatively reasonable period of time. The comparison of the financial statement of one year with that of another year will be effective and meaningful only if accounting practices and methods remain unchanged over year.

d. Conservatism or Prudence Principle: This principle calls for losses while recording accounting information but at the same time does not permit anticipation of profits. This principle implies that while preparing financial statements all possible losses are to be provided for but incomes can be recognized only when there is a certainty. It is base on the principle of prudence that stock is the value at market price or cost price whichever is less and provision is provided for doubtful debts.

Question 16.
According to ________ concept, it is assumed that business will last for a long period. (Say 2012)
a) Going concerned
b) Accounting entity
c) Dual aspect
d) Consistency
Answer:
a) Going concerned

Question 17.
A firm purchased pen and paperweight and included these items under the head stationery. Identify the relevant accounting principle. (Say 2012)
Answer:
Materiality Principles

Question 18.
Premier Ltd. supplies stationeries to ABT Ltd. on credit assuming that they can realise the amount in the future period. Name the relevant accounting concept and explain it. (Say 2012)
Answer:
Going concerned or Revenue Realisation concept.

Question 19.
Transactions relating to the qualitative aspect of business are not recorded because of the _________ (March 2013)
a) money measurement concept
b) entity concept
c) accrual concept
d) consistency principle
Answer:
a) money measurement concept

Question 20.
Find the odd one and state the reason. (March 2013)
a) Matching
b) Full disclosure
c) Dual aspect
d) Going concerned
Answer:
d) Going concerned.
All others are Accounting principles.

Question 21.
A firm decided to make provision for doubtful debts @10% on debtors for the year 2012-13. Name the relevant accounting principle applied here and explain. (March 2013)
Answer:
Conservatism or Prudence Principle: This principle calls for losses while recording accounting information but at the same time does not permit anticipation of profits. This principle implies that while preparing financial statements all possible losses are to be provided for but incomes can be recognized only when there is a certainty. It is base on the principle of prudence that stock is the value at market price or cost price whichever is less and provision is provided for doubtful debts.

Question 22.
‘Business entity assumption is not applicable to a partnership firm.’ State whether this statement is True or False. (March 2014)
Answer:
False. Business Entity Assumption applies to all forms of business like sole proprietorship, partnership, and Joint Stock companies.

Question 23.
Accounting standards in India are issued by _______ (March 2014)
Answer:
Accounting Standard Board (ASB) was set up by the Institute of Chartered Accountants of India.

Question 24.
Which one of the following principles of accounting helps to equate the assets of a firm with its liabilities? (March 2014)
a) Full Disclosure principle
b) Duality principle
c) Matching principle
d) Cost principle
Answer:
b) Duality principle

Question 25.
Which assumption of accounting, states that the capital supplied by the proprietor is a liability to the business? Describe it in one or two sentences. (March 2014)
Answer:
Accounting Entity/Business Entity Assumption This concept assumes that the entity of business is different from its owners. The business is treated as a unit or entity separate from the person who control it. The proprietor is treated as a creditor to the extent of the amount invested by him on the assumption that he has given money and the business has received it.

Question 26.
Identify the relevant principles and concepts associated with the following. (March 2015)

1. The quality of manpower is not recorded in the books of accounts.
2. Capital is a liability for the business.
3. For every debit, there is an equal and corresponding credit.
4. Contingent liabilities are shown as a footnote in the balance sheet.
5. Anticipate no profit but provide for all possible losses.

Answer:

1. Money measurement concept
2. Business Entity concept
3. Duality principle
4. Full Disclosure Principle
5. Prudence or conservatism Principle

Question 27.
Every transaction has two aspects which will be recorded in the books of accounts. (March 2015)
a) Identify and explain the accounting concept referred to above, by giving suitable examples.
b) Narrate a transaction which affects only the asset side of an accounting equation.
Answer:
a) Duality Principle
According to this concept, each and every business transaction has two aspects’ – a giving aspect and a receiving aspect. The giving aspect of a transaction is called “credit” and the receiving aspect of a transaction is called “Debit”.
For example Manu started the business with Rs. 10000 The effect of this transaction is that
It increases cash (assets) Rs. 10000
It increases capital (liability) Rs. 10000

b) Purchased goods for cash
cash deposited into bank
sales of assets

Question 28.
Match the following: (Say 2015)

Answer:
a) Matching concept – Salary outstanding
b) Money measurement Concept – Efficiency of the labour
c) Conservatism concept – Provision for bad debts
d) Vouchers and bills – Verifiable objective

Question 29.
Which one of the following is INCORRECT. (March 2016)
a) Assets = Liabilities + Capital
b) Liabilities = Assets – Captial
c) Captial = Assets – Liabilities
d) Liabilities = Assets + Captial
Answer:
d) Labilities = Assets + Capital

Question 30.
The fact that a business is separate and distinguished from its owner is best exemplified by the ______ concept. (March 2016)
a) money measurement
b) going concerned
c) business entity
d) cost
Answer:
c) Business entity

Question 31.
Identify the accounting principle related to the following transactions. (March 2016)
a) A land was purchased for Rs.5,00,000. But the market value of it was Rs.7,50,000. It was recorded in the books of the firm at Rs.5,00,000.
b) A business unit would continue to carry out its operations indefinitely fora long period of time and not liquidate in the near future.
Answer:
a) Historical cost principle/Cost principle
b) Going concern concept

Question 32.
In a meeting, the General Manager appreciate the sales department’s achievement of Rs.25 lakhs sales during the year 2015. But this activity of the General Manager is not recorded in the accounts of the business. (March 2016)
a) Identify the accounting principle on the basis of which this activity is not recorded?
b) Explain the above principle.
Answer:
a) Money measurement concept
b) According to this concept, transactions that can be measured in terms of money only are recorded in the books of accounts. Here, the activity of the general manager cannot be measured in terms of money.

Question 33.
Rajanesh is a manager with great expertise in management and leading his firm very well. But his expertise does not find a place in the accounting records of the firm. (March 2016)
a) Is it genuine according to the rules of accounting?
b) State your answer with the reason.
Answer:
a) Yes
b) According to the money measurement concept, transactions that can be measured in terms of money only are recorded in the books of accounts.

Question 34.
State the relevant principles/Concepts. (Say 2016)

Answer:

1. Accounting Entity concept or Business Entity concept
2. Money Measurement concept
3. Going concern concept
4. Consistency principle
5. Conservatism or prudence principle
6. Matching principle

Question 35.
Transactions between owner and business are recorded due to the ______ principle. (March 2017)
a) going concerned
b) accounting entity
c) matching
d) consistency
Answer:
b) accounting entity

Question 36.
A building worth Rs. 10 lakhs is purchased for Rs. 8 lakhs and recorded the same in the books of account at Rs. 8 lakhs.
a) Name the accounting principle referred to in the above. (March 2017)
b) Explain that principle.
Answer:
a) Historical cost principle
b) This principle requires that all transactions should be recorded at their acquisition cost. The cost principle assumes that all assets are to be recorded at the total amount paid to acquire them and this cost is the basis for all subsequent accounting for those assets.

Question 37.
Match the following. (March 2017)

Answer:
a → iv. Principle of conservatism
b → iii. Dual aspect concept
c → ii. money measurement concept
d → i. objectivity principles

Kerala State Board New Syllabus Plus One Accountancy Chapter Wise Previous Questions and Answers Chapter 1 Introduction to Accounting.

Kerala Plus One Accountancy Chapter Wise Previous Questions and Answers Chapter 1 Introduction to Accounting

Question 1.
Find the odd one out. (March 2010)
a) Machinery
b) Land and building
c) Closing stock
d) Furniture
Answer:
c) Closing stock

Question 2.
“The primary objective of accounting is to provide information to facilitate business decisions”. Mention any four objectives of accounting. (March 2010)
Answer:
1) Maintenance of business records
2) Ascertainment of profit/loss
3) Ascertainment of financial position
4) Providing information to users

Question 3.
The major objectives of accounting include ascertaining the operating results of a business. Mention four advantages of accounting to business. (March 2010)
Answer:
The following are the important objectives of accounting.

• Keeping records of business transactions.
• Ascertainment of Profit or Loss.
• Ascertainment of the financial position of business enterprises.
• Providing meaningful information to different groups of people having an interest in the business.

a) Keeping of records of business transaction
The main purpose of accounting is to identify business transactions of financial nature and enter into appropriate books of accounts. The accounting records should be made properly and systematically, so that requisite information may be obtained at a glance.

b) Ascertainment of Profit or Loss
The result of business (Profit or Loss) is available from the statement prepared for ascertaining it, called the Profit and Loss Account.

c) Ascertainment of financial position
At the end of an accounting year, a position statement is known as the ‘Balance Sheet’ is prepared. The value of assets and liabilities are depicted in the Balance Sheet. The Balance sheet gives a true and fair view of the state of affairs of the concern.

d) Providing meaningful information to different groups of people having an interest in the business
Accounting records provide meaningful information to a different group of people having an interest in the business.

Question 4.
Define accounting and explain five objectives of accounting. (March 2010)
Answer:
According to American Institute of certified Public Accountants, “Accounting is the art of recording, classifing and summarizing in a significant manner and in terms of money, transations and events which are in part, at least, of a financial character and interpreting the results there of.”
The following are the important objectives of accounting.
a) Keeping of records of business transaction.
b) Ascertainment of Profit or Loss.
c) Ascertainment of financial position of business enterprises.
d) Providing meaningful information to different groups of people having interest in the business.

Question 5.
Business sold goods to Mujeeeb on credit. Mujeeb is the _________ of the business. (March 2011)
Answer:
Debtor

Question 6.
What represents the amount invested by the owner into the business? (March 2011)
a) Assets
b) Revenue
c) Capital
Answer:
c) Capital

Question 7.
If Mr. Kumar purchased from our business for Rs. 10,000, he is our creditor. (March 2011)
Answer:
False, Debtor

Question 8.
Assets that can be converted into cash with a year are called current assets. (March 2011)
Answer:
True

Question 9.
“The primary objective of accounting is to provide information to facilitate business decisions.” Mention any four objectives of accounting. (March 2011)
Answer:
a) Facilitate maintenance of business records
b) Ascertainment of profits or loss
c) Ascertainment of financial position
d) Providing information to users.

Question 10.
_________ are the internal users of an account. (March 2012)
Answer:
Owners

Question 11.
Fund based accounting is used by ________ (March 2012)
a) multinational companies
b) trading organizations
c) government organizations
d) manufacturing organizations
Answer:
c) government organizations

Question 12.
Fathima took an educational loan of Rs. 10,000 from SBI, Calicut. The relationship which exists between SBI and Fathima is ______ (March 2012)
a) Fathima is the debtor of SBI, Calicut
b) SBI, Calicut is the debtor of Fathima
c) Fathima is the creditor of SBI, Calicut
d) Fathima is the proprietor of SBI, Calicut
Answer:
a) Fathima is the debtor of SBI, Calicut

Question 13.
A student of XI commerce, after going through the topic, “Capital expenditure and revenue expenditure” has classified certain expenditure as given below. (March 2012)

Do you agree with the above classification? If not correct it.
Answer:
No, Capital expenditure

• Machinery purchased
• Installation charge on machinery

Revenue Expenditure

• Depreciation on machinery
• Rent paid
• Goods purchases

Question 14.
Identify the events not amenable to accounting treatment. (Say 2012)
a) Sale of goods
b) Salary paid
c) Directors are appointed
d) Rent received
Answer:
c) Directors are appointed

Question 15.
Find the odd one out. (Say 2012)
a) Manager
b) Bank
c) Government
Answer:
a) Manager

Question 16.
Minnu is working as an accountant in an organization and Chinnu is working as a book-keeper. Minnu argued that her work is much wider than that of Chinnu. Do you agree? Why? (Say 2012)
Answer:
Yes.

Question 17.
Complete the series based on the hint given: (March 2013)
Hint: Intangible asset – goodwill
a) Fictitious asset – ______
b) Liquid asset – _________
Answer:
a) Fictitious asset – Preliminery Expenses/Profit & Loss Debit balance.
b) Liquid asset – Cash/Bank/Debtors/Bill receivables.

Question 18.
Name any to internal users of accounting information of your choice. (Say 2012)
Answer:
Managers, Owners, Employees, Management

Question 19.
Mr. Ali is of the opinion that all transactions of a businessman are business transactions. Do you agree with him? Why? (Say 2012)
Answer:
No, Business transactions, which can be expressed in terms of money and have an impact on the assets and liabilities of the business.

Question 20.
The difference between what is owed and what is owed by a business is called ______ (March 2014)
a) assets
b) Liabilities
c) capital
d) profit
Answer:
c) capital

Question 21.
Under which one of the following can the asset of ‘Debtors’ be well placed? (March 2014)
a) Real asset
b) Fixed asset
c) Current asset
d) Human asset
Answer:
c) Current asset

Question 22.
Choose the appropriate answer from the bracket. (March 2014)
(Goods, Liabilities, Assets)
a) Things in which a business deals: __________
b) Things with which a business deals: __________
Answer:
a. Goods
b. Assets

Question 23.
Reliability is one of the qualitative features of accounting. Give two more such features. (March 2014)
Answer:
Relevance, Understandability, Timeliness, Comparability

Question 24.
In how many ways are assets classified? Mention these ways. (March 2014)
Answer:
Assets can be grouped under the following categories:

• Fixed Assets
• Current Assets
• Tangible Assets
• Intangible Assets
• Fictitious Assets
• Wasting Assets

Question 25.
Classify the following liabilities under appropriate heads. (March 2015)

1. Bills payable
2. Bank overdraft
3. Debentures
4. Creditors

Answer:

1. Bills payable – Current Liability
2. Bank overdraft – Current Liability
3. Debentures – Longterm Liability
4. Creditors – Current Liability

Question 26.
What do you mean by accounting? (March 2015)
Answer:
Accounting is an information system which receives data, inputs, processes the same, and gives its output in the form of information which is useful for decision making.

Question 27.
The creditors and bankers need qualitative accounting information for taking appropriate decisions. What qualitative features do they expect in accounting information? (March 2015)
Answer:
Reliability, Relevance, Understandability, comparability, and timeliness.

Question 28.
Write any three objectives of accounting. (March 2015)
Answer:
Objectives of Accounting

• Facilitate maintenance of business records
• Ascertainment of profit or loss
• Ascertainment of financial position
• Providing information to users.

Question 29.
Pick out the wrong pair. State the reason. (Say 2015)
a) Patent, Copyright
b) Stock, Debtors
c) Salary, Rent
d) Cash, Furniture
Answer:
d) Cash, furniture

Question 30.
Find the odd one and state the reason. (March 2016)
a) Debtors
b) Creditors
c) Cash at bank
d) Stock
Answer:
b) Creditors
All others are current assets, this is a current liability.

Question 31.
Which of the following is NOT a business transaction? (March 2016)
a) Bought motorcar for business Rs. 1,00,000
b) Paid employee’s salary Rs. 1,000
c) Paid sons’ fees from business Rs. 2,000
d) Paid sons’ fees from his personal account Rs. 2,000
Answer:
d) Paid sons’ fees from his personal account Rs.2,000

Question 32.
Saritha, dealing in stationery items, purchased an alamarah for 34,000 and also purchased stationery items like pen, pencil, paper, etc for Rs. 10,000. (March 2016)
a) Which of the above transactions is a capital expenditure?
b) Distinguish between capital expenditure and revenue expenditure.
Answer:
a) Purchase of Alamarah
b)

Question 33.
Things or properties of value are called _______ (Say 2016)
a) assets
b) liabilities
c) capital
d) revenue
Answer:
a) assets

Question 34.
Accounting means recording of _______ (March 2017)
a) economic transactions
b) economic events
c) both options a & b
d) neither options a & b
Answer:
c) both options A and B

Question 35.
Vinod took a loan of Rs. 1,00,000 from Canara Bank. Identify the debtor in the above transaction. (March 2017)
Answer:
Vinod – Debtor

Question 36.
Accounting possesses certain qualitative features. List them. (March 2017)
Answer:
Qualitative features of accounting are
a) Reliability
b) Relevance
c) Understandability
d) comparability

Question 37.
Classify the following assets under appropriate heads. (March 2017)
a) Cash
b) Machinery
c) Land
d) Stock
Answer:
Fixed Assets – Machinery
Current Assets – Cash

Students can Download Chapter 10 IT Applications Notes, Plus One Computer Application Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Notes Chapter 10 IT Applications

E-Governance
The integration of computers and communication technology for the benefit of government functions to the public is termed as E-Governance by this Govt can serve the public in a convenient, efficient, and transparent manner.

Types of interactions in e-Governance facilitate interaction between different Stakeholders in governance

• Government to Government(G2G): Electronically exchanging data or information among Government agencies, departments, or organizations.
• Government to Citizens(G2C): Exchange information between Government and Citizens
• Government to Business(G2B): Interaction between the Government and Businessmen.
• Government to Employees(G2E): The exchange of information between the Government and its employees

E-Government infrastructure
a) State Data Centre(SDC): It is used for providing e-Governance to Government agencies(G2G), Citizens(G2C), Business persons(G2B) by National e-Governance Plan(NeGP). The services are

b) Kerala State Wide Area Network(KSWAN)
It is envisaged to be the core common network infrastructure for e-Governance and the State Information Infrastructure(SII), connecting Thiruvananthapuram, Kochi, and Calicut. It acts as the backbone of SII.

c) Common Service Centre(CSC): These are the web-enabled points of the government, private, and social sector services. They provide services such as Agriculture, Health, Banking, Educational, Entertainment, Commercial, Transport services for the rural citizens of India. In Kerala, Akshaya centers are working as CSC.

Akshaya centers: These were launched in 2002 in the Malappuram Dist. In Kerala by the project of Kerala State Information Technology Mission(KSITM). Its aim is to provide services such as e-grants, e filing, e district, e-ticketing, ration card application, voter Id application, insurance, and Banking to the peoples of Kerala.

Benefits of E-governance: Its main aim is to provide better service to the people at any time and place with high speed. In the modern world, it is very helpful and convenient for people.

• It enables automation of Govt, services
• It ensures the participation of citizens hence strengthen the democracy
• It ensures more transparency hence eliminates corruption
• It enhances the responsibilities of various Govt. Departments
• Its proper implementation saves time and money of the people by avoiding unnecessary visits to offices.

Challenges to E-Governance

• Due to lack of e-Literacy, there is difficulty to access the service of E-Governance.
• High-security measures are required because of the possibility of cyberattacks.
• Implementation and maintenance requires a huge amount and planning
• Some people refuse to give personal information due to anxiety
• Various Departments’ integration is needed for the efficiency and effectiveness of e- Governance

Useful E Governance websites

E-business(electronic Business): Providing services or running a business through the internet is called E-business.

e-commerce and e-business: Both are different. E-commerce means Electronic commerce. It includes the exchange of goods or services through the internet that involves the exchange of money whereas e-Business includes activities to run a business.

Electronic Payment System(EPS): It is also called plastic money that is electronically exchanging money between two individuals or firms(buyers and sellers) in, an online environment.

E-banking (Electronic Banking): Through electronic channels doing all the banking activities at any time and place through the internet.

Advantages of e-business:

• It overcomes geographical limitations
• It reduces the operational cost
• It minimizes the time and cost
• It remains open all the time
• We can locate the product faster from a wider range of choices

Challenges to E-business

• Peoples are unaware of IT applications and its uses
• Most peoples don’t have plastic money(credit/debit card) and net banking
• It requires high-security measurements otherwise you may lose money
• We can’t touch or smell products through online
• Some companies may not have proper Goods delivery service.

Useful e-Business websites

Learning: It is the use of electronic media(lt includes text, audio, video, image, animation, etc), educational technology(lt includes Satellite TV, CD ROM, Computer Based Learning, etc) and information and communication technologies(ICT- it uses intranet/extranet and web-based learning) in education.

e-Learning tools

• Electronic books reader(eBooks): With the help of a tablet or portable computer or any other device we can read digital files by using an s/w is called electronic books reader.
• e-text: The electronic format of textual data is called e-Text.
• Online chat: Real-time exchange of text or audio or video messages between two or more people over the Internet.
• e-Content: The data or information such as text, audio, video, presentations, images, animations etc, are stored in electronic format.
• Educational TV channels: TV channels dedicated only for the e-Learning purpose.
  Eg. VICTERS (Virtual Classroom Technology on Edusat for Rural Schools OR Versatile ICT Enabled Resources for Students)

Advantages of E-Learning :

• It can offer a variety of courses to a large number of students from distant locations.
• It saves journey time and money, instructor fees, etc.
• People can enjoy e-Learning at a lower cost
• It enables people to do courses conducted by national or international institutions.

Challenges to e-Learning

• Face to face contact between student and teachers is not possible
• Proper interaction is limited lack of infrastructure facilities
• Its implementation requires a computer and high-speed Internet
• The pupil may not get the proper motivation
• It does not provide a real lab facility

Useful e-Learning websites

ICT applications in health care
In the field of medicine and healthcare computers play a very important role. Such as diagnosing diseases, monitoring patients during surgery etc.

Medical equipment: Most of the medical equipment such as CT scanner, MRI scanner, Ultra Sound scanner, ECG, ECHO test, TMT, etc work with the help of computers

Electronic Medical Record(EMR): It is a digital version of a paper chart that contains all of a patient’s medical history from one practice. An EMR is mostly used by doctors for diagnosis and treatment.

Web-based support/diagnosis
Internet is used by the doctors to acquire information to diagnose and give treatment to the patients who are suffering from diseases,

Telemedicine:
With the help of Tele-Medicine, equipment doctors and nurses can examine patients in remote locations by monitoring the patient conditions such as BP, temperature etc., and give the correct medical treatment. Telemedicine is implemented with a telephone line and a computer.

Research and development:
Computers play an inevitable role in almost every branch of science and engineering. The role of computers in different fields of research and development is unavoidable. The most complex genetic problem may be evaluated with the help of computers easily and can simulate the actual systems using a computer. The computers help in diagnosis, treatment of patients and better running of hospitals

ICT enabled services:
Business Process Outsourcing(BPO): A business firm’s main aim is to increase the profit by reducing the expenditure for this some works are transferred to other contractors(manpower supply company common in other countries). The parent company is not responsible to such employees but the work will be carried out smoothly.

Knowledge Process Outsourcing(KPO): It is a form of outsourcing. Here the main job is knowledge and information related that is carried out by a third party company.

Call center: It is a third party company and its main aim is to serve the public for the payment of bills, purchase of goods, doubt clearance, etc. Here Telephone facility is set up to handle incoming and outgoing calls about goods or services for an organization.

Teleconferencing: It is a way of conferring, discussing or communicating by audio and video circuits, by a group of people located in geographically distributed areas. There are two types of conferencing video and audio. In audio conferencing, the participants can’t see each other but only hear the voices of one another.

Video conferencing: It is a type of Teleconferencing. The participants can see each other live on-screen and can speak to each other with the help of teleconferencing. They must.be sit in conference rooms connected through a teleconference system(A video camera and a speakerphone are connected to a computer with an Internet connection).

Students can Download Chapter 9 Internet Notes, Plus One Computer Application Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Notes Chapter 9 Internet

History of the Internet: the Internet means an international network of networks. The first form of Internet is ARPANET(Advanced Research Project Agency Network) started by the US Department of Defence for their military during 1970’s. In 1989 a team lead by Tim Berners Lee introduced WWW(World Wide Web) by using the protocol HTTP. In 1998, the Internet Corporation for Assigned Names and Numbers (ICANN) was established.

Internet: It is a network of networks. It means that the international network. We can transfer information between computers within nations very cheaply and speedily.

Intranet: A private network inside a company or organisation is called an intranet.
Extranet: It allows vendors and business partners to access the company resources.

The hardware and software requirements for the internet.

• A computer with a modem (internal/external)
• A telephone connection
• An account with an ISP
• A browser S/W eg: Internet ExplorerorMozilla…

Types of connectivity
There are two ways to connect to the internet. First one dialing to an ISP’s computer or with a direct connection to an ISP.

Dial-up Connection: Here the internet connection is established by dialing into an ISP’s computer. If ISP is not busy they verify the user name and password if it is valid they will connect our computer to the internet.lt uses Serial Line Internet Protocol (SLIP) or Point to Point Protocol (PPP). It is slower and has a higher error rate.

Direct connection: In direct connection, there is a fixed cable or dedicated phone line to the ISP. Here it uses ISDN (Integrated Services Digital Network) a high-speed version of a standard phone line. Another method is leased lines that uses fibre optic cables. Digital Subscribers Line (DSL) is another direct connection, this uses copper wires instead of fibre, optic for data transfer. Direct connection provides high-speed internet connection and error rate is less. Fibre To The Home(FTTH) uses optical fibers for data transmission.

Wireless broadband connectivity
a) Mobile broadband: Accessing the Internet using wireless devices like mobile phones, tablet, USB dongles.

b) Wi-MAX(Wireless Microwave Access): It uses microwaves to transmit information across a network in a range 2 GHz to 11 GHz over very long distance.

c) Satellite broadband: Accessing internet through satellite. A Very Small Aperture Terminal(VSAT) dish antenna and transceiver and modem are required at the user’s location. Expensive and high speed.

Internet access sharing methods:
One Internet connection can be shared among several computers using a LAN, Wi-Fi or Li-Fi
a) Using LAN: The Internet connection in a LAN can be shared among other computers in the network

b) Using Wi-Fi (Wireless Fidelity): It uses radio waves to transmit information across a network in a range of 2.4 GHz to 5 GHz in short distance. Nowadays this technology is used to access the internet in campuses, hypermarkets, hotels by using Laptops, Desktops, tablet, mobile phones etc

c) Using Li-Fi(Light Fidelity) network: It is a fast optical(uses visible light for data transmission) version of Wi Fi. Its main component is a LED. lamp that can transmit data and a photodiode that acts as a receiver.

Services on the Internet
a) www – World Wide Web – This means this website address is unique and can be accessed each nook and corner of the world.

b) A browser is a piece of software that acts as an interface between the user and the internal working of the. internet. With the help of a browser the user can search information on the internet and it allows user to navigate through the web pages. The different browsers are

• Microsoft internet explorer
• Mozilla Firefox
• Netscape Navigator
• Google Chrome
• Opera

c. Web Browsing:

1. The browser determines the URL entered.
2. The browser asks the DNS for URLS corresponding IP address (Numeric address)
3. The DNS returns tne address to the browser.
4. The browser makes a TCP connection using the IP address.
5. then it sends a GET request for the required file to the server.
6. The server collects the file and send it back to the browser.
7. The TCP connection is released.
8. The text and the images in the web pages are displayed in the browser.

Search engines
By using search engines we will get a variety of information. It is a newly developed tool that helped to search the information on the internet more effectively and easily. Search engines are programs that help people to locate information from crores of website on internet using a database that consists of references. Users can interact with the search engine through the home page of the search engine. To get the information about artificial intelligence just type this in the box provided for it and click the search button. Search engines searches by using a particular search algorithm then displays the matching documents or web addresses. Search engine use soft wares called spiders or bots to search documents and their web addresses. Spiders search the internet using the directions given by the search engines and prepare an index and stores it in a database. The searching algorithm searched this database when the users submits a request and create a web page displaying the matching results as hyperlinks.
Eg: Google, Yahoo, Rediff etc.

Email(Electronic mail) : It is used to send text, multimedia messages between computers over internet. An example of an email id is [email protected]. Here jobi_cg is the user name, rediffmail is the website address and .com is the top-level domain which identifies the types of the organisation. To send an email we require an email address. Some websites provide free email facility. To send an email first type the recipient’s address and type the message then click the send button. The website’s server first check the email address is valid, if it is valid it will be sent otherwise the message will not be sent and the sender will get an email that it could not deliver the message. This message will be received by the recipient’s server and will be delivered to the recipient’s mailbox. He can read it and it will remain in his mailbox as long as he will be deleted. Simple Mail Transfer Protocol(SMTP) is used.

The email message contains the following fields.

1. To: Recipient’s address will be entered here. Multiple recipients are also allowed by using coma.
2. CC: Enter the address of other recipients to get a carbon copy of the message.
3. bcc: The address to whom blind carbon copies are to be sent. This feature allows people to send copies to third recipient without the knowledge of primary and secondary recipients.
4. From: Address of the sender
5. Reply to: The email address to which replies are to be sent.
6. Subject: Short summary of the message.
7. Body: Here the actual message is to be typed.

The advantages of email are given below:

• Speed is high
• It is cheap
• We can send email to multiple recipients
• Incoming messages can be saved locally
• It reduces the usage of paper
• We can access the mailbox anytime and from anywhere.

The disadvantages are:

• It requires a computer, a modem, software, and an internet connection to check the mail.
• Some mails may contain viruses
• Mailboxes are filled with junk mail. So very difficult to find the relevant mail.

a. Social media: Various social media are Internet forums, social blogs, microblogs etc.

1. Internet forums: It is an online discussion site where people can exchange information about various issues like social, political, educational, etc in text form.
2. Social blogs: Conducting discussions about particular subjects by entries or posts.
   Eg. Blogger.com
3. Microblogs: It allows users to exchange short messages, multimedia files etc.
   Eg. www.twitter.com
4. Wikis: In this, we can give our contributions regarding various topics.
   Eg. www.wikipedia.org
5. Social networks: By using these websites we can post our data and view others’ data.
   Eg. www.facebook.com
6. Content communities. By using these websites we can share multi-media files.
   Eg. www.youtube.com

b. Advantages of social media.

• Bring people together: It allows people to maintain the friendship
• Plan and organize events: It allows users to plan and organize events.
• Business promotion: It helps the firms to promote their sales.
• Social skills: There is a key role of the formation of society.

c. Disadvantages.

• Intrusion to privacy: Some people may misuse personal information.
• Addiction: sometimes it may waste time and money.
• Spread rumours: The news will spread very quickly and negatively.

Cyber Security: It is used to provide protection of valuable information such as credit card information from unauthorized access, intentional access, deletion etc. while shopping on the internet.

Computer virus: A virus is a bad program or harmful program to damage the routine working of a computer system. It reduces the speed of a computer. It may delete the useful system files and make the computer useless.

Worm: It is a stand-alone malware program that replicates itself in order to spread to other computers. It slows down the traffic by consuming the bandwidth. In 2000 a worm called “ILOVEYOU” is affected by many computers.

Trojan horse: It appears as useful software but it is harmful software and it will delete useful software or files.

Spams: Sending an email without the recipient’s consent to promote a product or service is called spamming. Such an email is called spam.

Hacking: It is a process of trespassing computer networks. Two types of white hats and black hats. White hats hack the computer networks to test the security but black hats intentionally stealing valuable data or destroying data.

Phishing (Fishing): It is an attempt to get other information such as usernames, passwords, bank a/c details etc by acting as the authorized website. Phishing websites have URLs and home pages similar to their original ones and mislead others it is called spoofing.

Denial of Service(DoS) attack: Its main target is a Web server. Due to this attack, the Web server/computer forced to restart and this results in refusal of service to the genuine users. If we want to access a website first you have to type the website address in the URL and press the Enter key, the browser requests that page from the webserver. Dos attacks send a huge number of requests to the web server until it collapses due to the load and stop functioning.

Man in the Middle attacks: It is an attack in which an attacker secretly intercepts electronic messages sent by the sender to the receiver and then modifies the message and retransmit it to the receiver. To prevent this type, of attack encrypted connections such as HTTPS(HTTP Secure), SFTP(Secure FTP), etc, must be used, which will be displayed in the URL.

Preventing network attacks
Firewall: It is a system that controls the incoming and outgoing network traffic by analyzing the data and then provides security to the computer network in an organization from another network (internet)

Antivirus scanners: It is a tool used to scan computer files for viruses, worms, and Trojan horses and cure the infected system. If any fault found it stops the file from running and stores the file in a special area called Quarantine(isolated area) and can be deleted later.

Cookies: Cookies are small text files that are created when we visit a website that keeps track of our details. This information will help the hacker to use it for malicious purposes. It acts like spyware.

Guidelines for using computers over the internet

• Emails may contain Viruses so do not open any unwanted emails
• Download files from reputed sources(sites)
• Avoid clicking on pop-up Advt.
• Most of the Viruses spread due to the use of USB drives so use cautiously.
• Use a firewall in your computer
• Use anti-virus and update regularly
• Take backups in regular time intervals

Students can Download Chapter 8 Computer Networks Notes, Plus One Computer Application Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Notes Chapter 8 Computer Networks

Computer network: Two or more computers connected through a communication media that allows the exchange of information between computers is called a Computer Network.
Eg: Internet

Need for network
The advantages of Networks are given below.

1. Resource sharing: All the computers in a network can share software (programs, data ) and hardware (printer, scanner, CD drive, etc.).
2. Reliability: If one computer fails, the other computer can perform the work without any delay. This is very important for banking, air traffic control, and other application.
3. Price Vs Performance: A mainframe computer can be 10 times faster than a PC but it costs a thousand times a PC. Therefore instead of a mainframe 10 personal computers are used with less cost and the same performance.
4. Communication Medium: It is a powerful communication medium. We can exchange information between computers in a network.
5. Scalable: This means, System performance can be increased by adding computers to a network.

Terminologies
Bandwidth: The maximum amount of data that can be transmitted by the medium measured in Hertz.
Noise: It is the unwanted electrical or electromagnetic interferences that adversely affect the transmitted data signals.
Node: A computer or an I/O device connected to a network is called Node.

Data communication system
Communication is the exchange of information between two human beings. But data communication is the exchange of information between two computers(devices).
Message: It is the data/information to be transmitted from one computer to another
Sender: It is a computer or a device that sends data. It is also called source or transmitter
Receiver: It is a computer or a device that receives data.
Medium: It is the path through which a message transmitted from the sender to the receiver. There are two types Guided and Un Guided media. Protocol: The rules and conventions for transmitting data.

Communication Medium – There are two types guided and unguided.
Guided Media

1. Twisted Pair cable – 2 types unshielded twisted pair and shielded twisted pair. Two copper wires individually insulated and twisted around each other and put in a plastic cover.
2. Coaxial cable – A sturdy copper wire is insulated by plastic, it is covered just like a mesh by a conductor which is enclosed in a protective plastic coating. It is expensive, less flexible and more difficult to install. But it is more reliable and carry for higher data rates.
3. Optical fiber – These are made of glass fibers that are enclosed in a plastic jacket. It uses light instead of electrical signals. The light sources are LED or ILD.

Unguided Media

1. Radio waves – It transmits data at different frequencies ranging from 3 KHz. to 300 GHz.
2. Microwaves – Microwave signals can travel in straight line if there is any obstacle in its path, it can’t bend. So it uses tall towers instead of short one.
3. Infrared waves – These waves are used for transmitting data in short distance and its frequency range is 300 GHz to 400 GHz.

Wireless communication technologies using radio waves

1. Bluetooth: This technology uses radio waves in the frequency range of 2.402 GHz to 2.480 GHz. And transmit data in a short distance. Mobile phones, Laptops, tablets etc use Bluetooth technology to transmit data.
2. Wi-Fi(Wireless Fidelity): It uses radio waves to transmit information across a network in a range 2.4 GHz to 5 GHz in a short distance. Nowadays this technology is used to access internet in Laptops, Desktops, Tablets, Mobile phones etc.
3. Wi-MAX(Wireless Microwave Access): It uses micro waves to transmit information across a network in a range 2 GHz to 11 GHz over very long distance.
4. Satellites: By using satellites we can communicate from any part of the world to any other. The ground stations are connected via satellite. The data signals transmitted from earth to satellite (uplink) ahd from the satellite to the earth (downlink).

Data communication devices: It acts as an interface between computer and the communication channel

Network Interface Card (NIC): This device enables a computer to connect to a network and transmit information.

Hub: It is a small, simple and inexpensive device used to connect computers(devices) to a network. If a computer wants to transmit data to another computer. First it sends to the hub, the hub retransmits this data to all other computers. Each and every computer gets the data and check whether it is for them or not. It increases the network traffic and hence the transmission speed is low.

Switch: It is an expensive device used to connect computers(devices) to a network. Unlike a hub, switch transmit data not to all computers, it retransmits data only to the intended computer. So the traffic is less and speed is high

Repeater – It is a device used to strengthen weak signals on the network.

Bridge – It is a device used to link the same type of network.

Router – It is similar to a bridge, but it can connect two networks with different protocols.

Gateway – It is used to connect two different networks with different protocols.

Data terminal equipment: This device are used to control data flow to and from a computer

Modem – It is a device used to connect the computer to the internet. It converts the digital signal into an analog signal (modulation) and vice versa (Demodulation)

Multiplexer – It combines the inputs from different channels of a medium and produces one output.

Network topologies: Physical or logical arrangement of computers on a network is called structure or topology. It is the geometrical arrangement of computers in a network. The major topologies developed are star, bus, ring, tree, and mesh.

1. Star Topology: A star topology has a server all other computers are connected to it. If computer A wants to transmit a message to computer B. Then computer A first transmit the message to the server then the server retransmits the message to computer B. That means all the messages are transmitted through the server. Advantages are added or remove workstations to a star network is easy and the failure of a workstation will not affect the other. The disadvantage is that if the server fails the entire network will fail.

2. Bus Topology: Here all the computers are attached to a single cable called bus. Here one computer transmits all other computers listen. Therefore it is called a broadcast bus. The transmission from any station will travel in both the direction. The connected computers can hear the message and check whether it is for them or not.
Advantages are added or remove a computer is very easy. It requires less cable length and the installation cost is less. The disadvantage is fault detection is very difficult because of no central computer.

3. Ring Topology: Here all the computers are connected in the shape of a ring and it is a closed-loop. Here also there is no central computer. Here a computer transmits a message, which is tagged along with its destination computer’s address. The message travels in one direction and each node check whether the message is for them. If not, it passes to the next node.
It requires only short cable length. If a single node fails, at least a portion of the network will fail. To add a node is very difficult.

4. Hybrid Topology: It is a combination of any two or more network topologies. Tree topology and mesh topology can be considered as hybrid topologies.

a) Tree Topology: The structure of a tree topology is the shape of an inverted tree with a central node and branches as nodes. It is a variation of bus topology. The data transmission takes place in the way as in bus topology. The disadvantage is that if one node fails, the entire portion will fail.

b) Mesh Topology: In this topology, each node is connected to more than one node. It is just like a mesh (net). There are multiple paths between computers. If one path fails, we can transmit data through another path.

Types of networks
The networks are classified into the following based upon the amount of geographical area that covers.
i) Personal Area Network(PAN): It is used to connect devices situated in a small radius by using guided media or unguided media

ii) Local Area Network (LAN): This is used to connect computers in a single room, rooms within a building, or buildings of one location by using twisted-pair wire or coaxial cable. Here the computers can share hardware and software. The data transfer rate is high and the error rate is less.
eg: The computers connected in a school lab.

iii) Metropolitan Area Network (MAN): A Metropolitan Area Network is a network spread over a city. For example a Cable TV network. MAN has a lesser speed than LAN and the error rate is less. The here optical fiber cable is used.

iv) Wide Area Network (WAN): This is used to connect computers over a large geographical area. It is a network of networks.
Here the computers are connected using telephone lines or Micro Wave stations or Satellites. Internet js an example for this. LAN and MAN are. owned by a single organization but WAN is owned by multiple organizations. The error rate in data transmission js high. ,

Logical classification of networks
Peer to peer: In this configuration, all the computers have equal priority. That means each computer can function as both a client and a server. There is no dedicated server.

Client-Server: In this configuration, a computer is powerful which acts as a dedicated server and all others are clients (work stations). A Server fulfills the needs of the clients.

• File Server: A computer that stores and manages files for other devices on a network
• Web Server: A computer that handles the requests for web pages.
• Print Server: A computer that handles the print jobs from other computers on a network.
• Database Server: A computer that manages the database.

Network protocols
A protocol is a collection of rules and regulations to transfer data from one location to another. Transmission Control Protocol (TCP), which uses a set of rules to exchange messages with other Internet points at the information packet level. Internet Protocol (IP), which uses a set of rules to send and receive messages at the Internet address level

FTP – File Transfer Protocol which is used for transferring files between computers connected to local network or internet.
HTTP – is a protocol used for WWW for enabling the web browse to access web server and request HTML documents.
DNS (Domain Name System): When we type web sites address in the address bar , the browser determines the URL and asks the DNS for URLS corresponding IP address (Numeric address). The DNS returns the address to the browser.

Identification of computers over a network: A computer gets a data packet on a network, it can identify the sender’s address easily. It is similar to our snails mail, each letter is stamped in sender’s post office as well as receiver’s post office.

Media Access Control(MAC) address. It is a unique 12 digit hexadecimal number (IMEI for mobile phones, it is a 15 digit decimal number) assigned to each NIC by its manufacturer. This address is known as MAC address and its permanent.
It is of the form. MM:MM:MM:SS:SS:SS.
The first MM:MM:MM contains the ID number of the adapter company and the second SS:SS:SS represents the serial number assigned to the adapter by the company.

Internet Protocol (IP) address: An IP address has 4 parts numeric address. Each parts contains 8 bits. By using 8 bits we can represent a decimal number between 0 to 255(28=256 numbers). Each part is separated by dot. A total of 4*8=32 bits used. But nowadays 128 bits are used for IP address.

Uniform Resource Locator(URL): Every resource on the internet has a unique URL. Mainly it has three parts
Eg: http://www.hscap.kerala.gov.in/index.html.
http: http means hyper text transfer protocol. It is a protocol used to transfer hyper text.
www: World Wide Web. With an email address we can open our mail box from anywhere in the world.
hscap.kerala: It is a unique name. It is the official website name of Single Window System
gov: It is the top-level domain. It means that it is a government organization’s website.
in: It is the geographical top-level domain. It represents the country, in is used for India.
index.html: It represents the file name.

TOP Level Domain Names

• .com – The site register for commercial purpose
• .edu – The site register for educational purpose
• .gov – The site register by Government agencies
• .mil – The site register for military services
• .net – The site register for network purpose
• .org – The site register by organizations

Country Specific Domain Names

• .in – India
• .au – Australia
• .ca – Canada
• .ch – China
• .jp – Japan
• .us – United States of America

Students can Download Chapter 7 Control Statements Notes, Plus One Computer Application Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Notes Chapter 7 Control Statements

These are classified into two decision making and iteration statements

Decision-making statements:
if statement:
Syntax: if (condition)
{
Statement block;
}
First, the condition is evaluated if it is true the statement block will be executed otherwise nothing will happen.

if… else statement:
Syntax: if (condition)
{
Statement block1;
}
Else
{
Statement block2;
}

Nested if
An if statement contains another if statement completely then it is called nested if.
if (condition 1)
{
if (condition 2)
{
Statement block;
}
}
The statement block will be executed only if both the conditions evaluated are true.

The else if ladder: The syntax will be given below
if (expression 1)
{
statement block 1;
}
else if (expression 2)
{
statement block 2;
}
else if (expression 3)
{
statement block 3;
}
else
{
statement block n;
}

Here firstly, expression 1 will be evaluated if it is true only the statement block1 will be executed otherwise expression 2 will be evaluated if it is true only the statement block 2 will be executed and so on. If all the expression evaluated is false then only statement block n will be executed

switch statement:
It is a multiple branch statement. Its syntax is given below.
switch(expression)
{
case value: statements;break;
case value: statements;break;
case value: statements;break;
case value: statements;break;
case value: statements;break;
…………..
default: statements;
}

First expression evaluated and selects the statements with matched case value. If all values are not matched the default statement will be executed.

Conditional operator: It is a ternary operator hence it needs three operands. The operator is ?:. Syntax: expression ? value if true : value if false. First evaluates the expression if it is true the second part will be executed otherwise the third part will be executed.

Iteration statements: If we have to execute a block of statements more than once then iteration statements are used.

while statement
It is an entry controlled loop. An entry controlled loop first checks the condition and execute(or enters in to) the body of loop only if it is true. The syntax is given below
Loop variable initialised
while(expression)
{
Body of the loop;
Update loop variable;
}

Here the loop variable must be initialised before the while loop. Then the expression is evaluated if it is true then only the body of the loop will be executed and the loop variable must be updated inside the body. The body of the loop will be executed until the expression becomes false.

for statement
The syntax of for loop is
for(initialization; checking ; update loop variable)
{
Body of loop;
}

First part, initialization is executed once, then checking is carried out if it is true the body of the for loop is executed. Then loop variable is updated and again checking is carried Out this process continues until the checking becomes false. It is an entry controlled loop.

do – while statement: It is an exit controlled loop. Exit control loop first execute the body of the loop once even if the condition is false then check the condition.
do
{
Statements
} while(expression);

Here the body executes at least once even if the condition is false. After executing the body it checks the expression if it false it quits the body otherwise the process will continue.

Students can Download Chapter 6 Introduction to Programming Notes, Plus One Computer Application Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Notes Chapter 6 Introduction to Programming

Structure of a C++ program
A typical C++ program would contain four sections as shown below.
Include files(Preprocessor directives)
Function declarations
Function definitions
Main function programs
Eg.
#include
using namespace std;
int sum(int x, int y)
{
return (x+y);
}
int main()
{
cout<<sum(2, 3);
}

Preprocessor directives: A C++ program starts with the preprocessor directive i.e., #include, #define, #undef, etc, are such a preprocessor directive. By using #inciude we can link the header files that are needed to use the functions. By using #define we can define some constants.
Eg. #define × 100. Here the value of x becomes 100 and cannot be changed in the program.
No semicolon is needed.

Header files:
header files: A header file is a pre-stored file that helps to use some operators and functions. To write C++ programs the header files are a must.
Following are the header files
iostream
iomanip
cstdio
cctype
cmath
cstring
The syntax for including a header file is as follows #include
Eg. #include

The main function: The main function is the first function which is invoked at the time of execution and the program ends within main(). The other functions are invoked from main().

Programming tips: The identifier name must be clear, precise, brief, and meaningful
Use clear and simple expressions.
Use comments wherever needed.
To give tips in between the program comments are used. A comment is not considered as part of the program and can not be executed. There are 2 types of comments single line and multiline.
Single line comment starts with //(2 slashes) but multi-line comment starts with /* and ends with */
indentation: Giving leading spaces to the statements is called indentation. It is a good programming practice.

Variable initialisation: Giving value to a variable at the time of declaration.
Eg: int age=16; Here the OS allocates 4 bytes memory for the variable age and it stores a value 16.

const – The access modifier: By using the keyword const we can create symbolic constants its value does not change during execution.
Eg: const int bp=100;

Type modifiers: With the help of type modifiers we can change the sign and range of data with the same size. The important modifiers are signed, unsigned, long and Short.

Shorthands in C++

Arithmetic assignment operators: It is faster. This is used with all the arithmetic operators as follows.

a) Increment operator(++): It is used for incrementing the content by one. ++x(pre increment) and x++ (post increment) both are equivalent to x = x+1.
b) decrement operator (–): It is used for decrementing the content by one. –x (pre decrement) and x– (post decrement) both are equivalent to x=x-1.

Prefix form: In this, the operator is placed before the operand and the operation is performed first then use the value.

Postfix form: In this, the operator is placed after the operand and the value of the variable is used first then the operation is performed.
Eg: Post increment a++
Here first use the value of ‘a’ and then change the value of ‘a’.
Eg: if a=10 then b=a++. After this statement b=10 and a=11 Pre increment ++a
Here first change the value of a and then use the value of a.
Eg: if a=10then b=++a. After this statement b=11 and a=11.

Precedence of operators: Consider a situation where an expression contains all the operators then the operation will be carried in the following order(priority)

Type conversion: Type conversions are of two types.
1) Implicit type conversion: This is performed by the C++ compiler internally. C++ converts all the lower sized data type to the highest sized operand. It is known as type promotion. Data types are arranged lower size to higher size is as follows.
unsigned int(2 bytes), int(4 bytes),long (4 bytes), unsigned long (4 bytes), float(4 bytes), double(8 bytes), long double(10 bytes)
2) Explicit type conversion: It is known as typecasting. This is done by the programmer. The syntax is given below.
(data type to be converted) expression
Eg. int x=10;
(float) x;
This expression converts the data type of the variable from integer to float.

Students can Download Chapter 5 Data Types and Operators Notes, Plus One Computer Application Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Notes Chapter 5 Data Types and Operators

Concepts of data types: The nature of data is different, data type specifies the nature of data we have to store.

C++ data types

Fundamental data types: It is also called built in data type. They are int, char, float, double and void
i) int data type: It is used to store whole numbers without fractional (decimal point) part. It can be either negative or positive. It consumes 4 bytes (32 bits) of memory. i.e. 2³² numbers. That is 231 negative numbers and 2³¹ positive numbers (0 is considered as +ve) So a total of 2³² numbers. We can store a number in between -2³¹ to + 2³¹ – 1.

ii) char data type: Any symbol from the keyboard, eg. ‘A’, ‘?’, ‘9’„…. It consumes one byte( 8 bits) of memory. It is internally treated as integers, i.e: 2⁸ = 256 characters. Each character is having a ASCII code, ‘a’ is having ASCII code 97 and zero is having ASCII code 48.

iii) float data type: It is used to store real numbers he. the numbers with decimal point. It uses 4 bytes(32 bits) of memory.
Eg. 67.89, 89.9 E-15.

iv) double data type: It is used to store very large real numbers. It uses 8 bytes(64 bits) of memory.

v) void data type: void means nothing. It is used to represent a function returns nothing.
User defined Data types: C++ allows programmers to define their own data type. They are Structure(struct), enumeration (enum), union, class, etc.
Derived data types: The data types derived from fundamental data types are called Derived data types. They are Arrays, pointers, functions, etc

Variables:
The named*memory locations are called variable. A variable has three important things

1. variable name: A variable should have a name
2. Memory address: Each and every byte of memory has an address. It is also called location (L) value
3. Content: The value stored in a variable is called content.lt is also called Read(R) value.

Operators: An operator is a symbol that performs an operation. The data on which operations are carried out are called operands. Following are the operators
1) Input(>>) and output(<<) operators are used to perform input and output operation. Eg. cin>>n;
cout<<n;

2) Arithmetic operators: It is a binary operator. It is used to perform addition(+), subtraction(-), division (/), multiplication(*) and modulus(%-gives the remainder) operations.
Eg. If x = 10 and y = 3 then

x/y = 3, because both operands are integer. To get the floating point result one of the operand must be float.

3) Relational operator: It is also a binary operator. It is used to perform comparison or relational operation between two values and it gives either true(1) or false(0). The operators are <, <=, >, >=, == (equality)and !=(not equal to)
Eg. If x = 10 and y = 3 then

4) Logical operators: Here AND(&&), OR(||) are binary operators and NOT (!) is a unary operator. It is used to combine relational operations and it gives either true(1) or false(0).
If x = 1 and y = 0 then

Both operands must be true to get a true value in the case of AND (&&) operation.
If x = 1 and y = 0 then

Either one of the operands must be true to get a true value in the case of OR(||) operation
If x = 1 and y = 0 then

5) Conditional operator: It is a ternary operator hence it needs three operands. The operator is?:. Syntax: expression ? value if true: value if false. First evaluates the expression if it is true the second part will be executed otherwise the third part will be executed.
Eg. If x = 10 and y = 3 then
x>y ? cout<>) operator is used to perform input operation.
Eg. cin>>n;

Output statements
output(<<) operator is used to perform output operation.
Eg. cout<<n; Cascading of I/O operations The multiple use of input or output operators in a single statement is called cascading of i/o operators. Eg: To take three numbers by using one statement is as follows cin>>x>>y>>z;
To print three numbers by using one statement is as follows
cout<<x<<y<<z;

Students can Download Chapter 4 Getting Started with C++ Notes, Plus One Computer Application Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Notes Chapter 4 Getting Started with C++

It is developed by Bjarne Stroustrup. It is an extension of the C Language.

Character set: To study a language first we have to familiarize the character set. For example, to study the English language first we have to study the alphabet. Similarly here the character set includes letters(A to Z & a to z), digits(0 to 9), special characters(+, -, *, /, …..) white spaces(non printable) etc..

Token: It is the smallest individual unit similar to a word in English or Malayalam language. C++ has 5 tokens
1) Keywords: These are reserved words for the compiler. We can’t use it for any other purposes
Eg: float is used to declare variables to store numbers with a decimal point. We can’t use this for any other purpose

2) Identifier: These are user-defined words. Eg: variable name, function name, class name, object name, etc…

3) Literals (Constants): Its value does not change during execution
i) Integer literals: Whole numbers without fractional parts are known as integer literals, its value does not change during execution. There are 3 types of decimal, octal, and hexadecimal.
Eg. Fordecimal 100, 150, etc..
For octal 0100, 0240, etc..
For hexadecimal 0 × 100, 0 × 1A, etc

ii) Float literals: A number with fractional parts and its value does not change during execution is called floating-point literals.
Eg. 3.14157, 79.78, etc…

iii) Character literal: A valid C++ character enclosed in single quotes, its value does not change during execution.
Eg. ‘m’, ‘f ’ etc

iv) String literal: One or more characters enclosed in double-quotes is called string constant. A string is automatically appended by a null character(‘\0’)
Eg. “Mary’s”,’’ India”,etc

4) Punctuators: In English or Malayalam language punctuation marks are used to increase the readability but here it is used to separate the tokens.
Eg:{,},(,),…

5) Operators: These are symbols used to perform an operation (Arithmetic, relational, logical, etc…)

Integrated Development Environment(IDE): It is used for developing programs

• It helps to write as well as editing the program.
• It helps to compile the program and linking it to other (header files and other users) programs
• It helps to run the program

Turbo C++ IDE
Following is a C++ IDE

a) Opening the edit window
Method I: File → Click the menu item New
Method II: Press Alt and F simultaneously then press N

b) Saving the program:
Click File → Save or Press Function key F2 or Alt+F and then press S
Then give a file name and press ok.

c) Running/executing the program
Press Alt+R then press R OR Click Run → press R, OR Press Ctrl + F9

d) Viewing the output: Press Alt+F5

e) Closing Turbo C++ IDE
Click File → then press Quit menu Or Press Alt+X

Geany IDE

• Step 1: Take Geany Editor and type the program (source code)
• Step 2: Save the file with extension .cpp
• Step 3: Compile the program by Click the Compile Option
• Step 4: After successful compilation, Click the Build option
• Step 5: Then click on the Execute option

Students can Download Chapter 3 Principles of Programming and Problem Solving Notes, Plus One Computer Application Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Notes Chapter 3 Principles of Programming and Problem Solving

Problem-solving using computers:
It has no intelligent quotient. Hence they are slaves arid human beings are the masters. It can’t make its own decisions. They can perform tasks based upon the instructions given by the humans (programmers).

Approaches in problem-solving
Top-down design: Larger programs are divided into smaller ones and solve each task by performing simpler activities. This concept is known as a top-down design in problem-solving

Bottom-Up design: Here also larger programs are divided into smaller ones and the smaller ones are again subdivided until the lowest level of detail has been reached. We start solving from the lowest module onwards. This approach is called a Bottom-up design.

Phases in programming
1. Problem identification: This is the first phase in programming. The problem must be identified then only it can be solved, for this, we may have to answer some questions. During this phase, we have to identify the data, its type, quantity, and formula to be used as well as what activities are involved to get the desired output is also identified for example if you are suffering from stomach ache and consult a Doctor. To diagnose the disease the doctor may ask you some questions regarding the diet, duration of pain, previous occurrences, etc, and examine some parts of your body by using a stethoscope X-ray, scanning, etc.

2. Deriving the steps to obtain the solution.
There are two methods, Algorithm and flowchart, are used for this.
a) Algorithm: The step-by-step procedure to solve a problem is known as an algorithm. It comes from the name of a famous Arab mathematician Abu Jafer Mohammed Ibn Musaa Al-Khowarizmi, The last part of his name Al-Khowarizmi was corrected to the algorithm.

b) Flowchart: The pictorial or graphical representation of an algorithm is called a flowchart.
Flow chart symbols are explained below
1) Terminal (Oval)

It is used to indicate the beginning and end of a problem

2) Input/Output (parallelogram)

It is used to take input or print output.

3) Processing (Rectangle)

It is used to represent processing That means to represent arithmetic operation such as addition, subtraction, multiplication

4) Decision (Rhombus)

It is used to represent decision making. It has one entry flow and two exit flows but one exit path will be executed at a time.

5) Flowlines (Arrows)

It is used to represent the flow of operation

6) Connector

3. Coding: The dummy codes (algorithm) or flowchart is converted into a program by using a computer language such s Cobol, Pascal, C++, VB, Java, ….. etc.

4. Translation: The computer only knows machine language. |t does not know HLL, but the human beings HLL is very easy to write programs. Therefore a translation’ is needed to convert a program written in HLL into machine code (object code). During this step, the syntax errors of the program will be displayed. These errors are to be corrected and this process will be continued till we get a “No errors” message. Then it is ready for execution.

5. Debugging: The program errors are called ‘bugs’ and the process of detecting and correcting errors is called debugging. In general, there are two types of errors syntax errors and logical errors. When the rules or syntax of the language are not followed then syntax errors occurred and it is displayed after compilation. When the logic of a program is wrong then logical errors occurred and it is not displayed after compilation but it is displayed in the execution and testing phase.

6. Execution and Testing: In this phase, the program will be executed and give test data for testing the purpose of this is to determine whether the result produced by the program is correct or not. There is a chance of another type of error, Run time error, this may be due to inappropriate data.

7. Documentation: It is the last phase in I programming. A computerized system must be documented properly and it is an ongoing process that starts in the first phase and continues till its implementation. It is helpful for the modification of the program later.

Students can Download Chapter 2 Components of the Computer System Notes, Plus One Computer Application Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Notes Chapter 2 Components of the Computer System

Hardware: The tangible parts of a computer that we can touch and see are called hardware.
Eg: Monitor, Keyboard, Mouse, CPU, Etc.

Processors: It is the brain of the computer and consists of three components
Arithmetic Logic Unit(ALU) – As the name implies it performs all calculations and comparison operations.
Control Unit(CU)- It controls over all functions of a computer
Registers – It stores the intermediate results temporarily.

A CPU is an Integrated Circuit(IC) package that contains millions of transistors and other components. Popular Processors are Intel core i3, core i5, core i7, AMD Quadcore etc.
Important registers inside a CPU are

• Accumulator: After performing an operation (arithmetic or logical) the result is stored in the accumulator
• Memory Address Register(MAR): It stores the address of the memory location to which data is either read or written by the processor.
• Memory Buffer Register (MBR) : It stores the data, either to be written to or read from the memory by the processor.
• Instruction Register(IR): It stores the instructions to be executed by the processor.
• Program Counter(PC): It stores the address of the next instruction to be executed by the processor.

Motherboard: It is a Printed Circuit Board(PCB). All the major components like Processor (Remember the processor must be compatible with the Motherboard), RAM, ROM, HDD, Graphics card, Sound card, etc are connected to the Motherboard.

Peripherals and Ports

• Serial Port: It transmits data one bit at a time (eg: 101000001010). Its transmission speed
  is low but it is cheaper. It is suitable to transmit data over long distance.
• Parallel port: It can transmit data more than one bit at a time. It is faster and used to connect the printer.
• USB (Universal Serial Bus) port: It has high bandwidth hence it is faster. Nowadays it is used to connect all the devices like keyboard, mouse, printer, scanner, pen drive, digital camera, mobile phones, dongle etc.
• LAN port: By using this port we can connect our computer to another network by a cable.
• PS/2(Personal System/2) poet: It is introduced by IBM for connecting keyboard and mouse earlier.
• Audio ports: It is used to connect audio devices like speakers, mic etc.
• Video Graphics Array (VGA) port: It is introduced by IBM to connect a monitor or LCD projector to a computer.
• High Definition Multimedia Interface(HDMI): Through this port, we can connect high definition quality video and multi-channel audio over a single cable.

Memory
Storage Unit(Memory Unit): A computer has huge storage capacity. It is used to store data and instructions before starts the processing. Secondly it stores the intermediate results and thirdly it stores information(processed data), that is the final results before send to the output unit(Visual Display Unit, Printer, etc)
Memory measuring units are given below.

• 1 bit – 1 or 0(Binary Digit)
• 4 bits – 1 Nibble
• 1 bits – 1 Byte
• 1024 Bytes – 1 KB(KiloByte)
• 1024 KB – 1 MB(Mega Byte)
• 1024 MB – 1 GB(Giga Byte)
• 1024 GB – 1 TB(Tera Byte)
• 1024 TB – 1 PB(Peta Byte)

Two Types of the storage unit
i) Primary Storage alias Main Memory: It is further be classified into Two – Random Access Memory (RAM) and Read-Only Memory (ROM). The one and only memory that the CPU can directly access is the main memory at a very high speed. It is expensive hence storage capacity is less.

RAM is volatile(when the power is switched off the content will be erased) in nature but ROM is nonvolatile (lt is permanent). In ROM a “boot up” program called BIOS(Basic Input Output System) is stored to “boots up” the computer when it switched on. Some ROMs are given below.
1. PROM(Programmable ROM): It is programmed at the time of manufacturing and cannot be erased.
2. EPROM (Erasable PROM): It can be erased and can be reprogrammed using special electronic circuit.
3. EEPROM (Electrically EPROM): It can be erased and rewritten electrically Cache Memory: The processor is a very high speed memory but comparatively RAM is slower than Processor. So there is a speed mismatch between the RAM and Processor, to resolve this a high-speed memory is placed in between these two this memory is called cache memory. Commonly used cache memories are Level(L1) Cache(128 KB), L2(1 MB)

ii. Secondary Storage alias Auxiliary Memory: Because of limited storage capacity of primary memory its need arises. When a user saves a file, it will be stored in this memory hence it is permanent in nature and its capacity is huge. Eg: Hard Disc Drive(HDD), Compact Disc(CD), DVD, Pen Drive, Blu Ray Disc etc.

a) Magnetic storage device: It uses plastic tape or metal/plastic discs coated with magnetic material.
Hard Disk: Instead of flexible or soft disk it uses rigid material hence the name hard disk. Its storage capacity and data transfer rate are high and low access time. These are more lasting and less error-prone. The accessing mechanism and storage media are combined together in a single unit and connect to the motherboard via cable.

b) Optical storage device.
Optical Disk: The high-power laser uses a concentrated, narrow beam of light, which is focused and directed with lenses, prisms and mirrors for recording data. These beams burn very very small spots in master disk, which is used for making molds and these molds are used for making copies on plastic disks. A thin layer of aluminum followed by a transparent plastic layer is deposited on it. The holes made by the laser beam are called pits, interpreted as bit 0 and unbumed areas are called lands interpreted as bit 1. Lower power laser beam is used to retrieve the data.

DVD(Digital Versatile Disc): It is similar to CD but its storage capacity is much higher. The capacity of a DVD starts.from 4.7 GB

Blu-ray Disc: It is used to read and write High Definition video data as well as to store very huge amount of data. While Cd and DVD uses red laser to read and write but it uses Blue-Violet laser, hence the name Bid ray disc. The blue-violet laser has a shorter wavelength than a red laser so it can pack more data tightly.

iii) Semiconductorstorage (Flash memory): It uses EEPROM chips. It is faster and long-lasting.
USB flash drive: It is also called a thumb drive or pen drive. Its capacity varies from 2 GB to 32 GB.
Flash memory cards: It is used in Cameras, Mobile phones, tablets etc to store all types of data.

Input/Output devices: It is used to supply data to the computer for processing
1. Keyboard: It is the most widely used device to input information in the form of words, numbers etc. There are 101 keys on a standard keyboard. The keys on the keyboard are often classified into alpha numeric keys (A to Z, 0 to 9), function keys (F1 to F12), special purpose keys (Special characters), cursor movement keys (arrow keys). While pressing a key, the corresponding code’s signal is transmitted to the computer.

2. Mouse: It is a pointing device, that controls the movement of the cursor, or pointer as a display screen. A mouse has two or.three buttons, it is often used in GUI oriented computers. Under the mouse there is a ball, when the mouse moves on a flat surface this ball also moves. This mechanical motion is converted into digital values that represent the x and y values of the mouse movement.

3. Light Pen: It is an input device that use a light-sensitive detector to select objects directly on a display screen using a pen. Light pen has a photocell placed in a small tube. By using light pen, we can locate the exact position on the screen.

4. Touch screen: It allows the user to enter data by simply touching on the display screen. This technology is applied in tablets, cell phones, computers etc.

5. Graphic tablet: It consists of an electronic writing area. We can create graphical images by using a special pen.

6. Touchpad: It is a pointing device found on portable computers(laptop). Just like a mouse it consists of two buttons below the touch surface to do the operations like left-click and right-click. By using our fingers we can easily operate.

7. Joy Stick: It is a device that lets the user move an object Quickly on the screen. It has a liver that moves in all directions and controls the pointer or object. It is used for computer games and CAD/CAM systems.

8. Microphone: By using this device we can convert voice signals into digital form.

9. Scanner: It is used to read text or pictures printed on paper and translate the information into computer-usable form. It is just like a photostat machine but it gives information to the computer.

10. Optical Mark Reader (OMR): This device identifies the presence or absence of a pen or pencil mark. It is used to evaluate objective type exams. In this method, special preprinted forms are designed with circles can be marked with dark pencil or ink. A high-intensity beam in the OMR* converts this into computer-usable form and detects the number and location of the pencil marks. By using this we can evaluate easily and reduce the errors.

11. Bar code/Quick Response (QR) code reader: Light and dark bars are used to record item name, code and price is called Bar Code. This information can be read and input into a computer quickly without errors using Bar Code Readers. It consists of a photo electric scanner and it is used in supermarket, jewellery, textiles etc. QR codes are similar to barcodes but it uses two dimensional instead of single-dimensional used in Barcode.

12. Biometric sensor: It is used to read unique human physical features like fingerprints, retina, iris pattern, facial expressions etc. Most of you give this data to the Government for Aadhaar.

13. Smart card reader: A plastic card(may be like your ATM card) stores and transmit data with the help of a reader.

14. Digital Camera: By using digital camera, we can take photographs and store in a computer. Therefore we can reduce the use of film. Hence it is economical.

Output devices: After the data processing the result is displayed as soft copy(soft copy can view, only by using a device) or hard copy(it can read
easily).
1) Visual Display Unit
a) Cathode Ray Tube (CRT) There are two types of CRT’s, mpnochrome (Black and white) and colour. Monochrome CRT consists of one electron gun but colour CRT consists of 3 electron guns (Red, Green and Blue) at one end and the other end coated with phosphor. It is a vacuum tube. The phosphor coated screen can glow when electron beams produced by electron guns hit, It is possible to create all the colours using Red, Green and Blue. The images produced by this is refreshed at the rate of 50 or 60 times each second. Its disadvantage is it is heavy and bulky. It consumes more power and emits heat. But it is cheap. Nowadays its production is stopped by the company.

b) Liquid Crystal Display (LCD): It consists of two electrically conducting plates filled with liquid crystal. The front plate has transparent electrodes and the back plate is a mirror. By applying proper electrical signals across the plates,1he liquid crystals either transmit or block the light and then reflecting it back from the mirror to the viewer and hence produce images.- It is used in where small sized displays are required.

c) Light Emitting Diode(LED): It uses LED behind the liquid crystals in order to light up the screen. It gives a better quality and clear image with wider viewing angle. Its power consumption is less.

d) Plasma Panels: It consists of two glass plates filled with neon gas. Each plate has several parallel electrodes, right angles to each other. When low voltage is applied between, two electrodes, one on each plate, a small portion of gas is glow and hence produce images. Plasma displays provide high resolution but are expensive. It is used in, where quality and size is a matter of concern.

e) Organic Light Emitting Diode(OLED) Monitors: It is made up of millions of tiny LEDs. OLED monitors are thinner and lighter than LCDs and LEDs. It consumes less power and produce better quality images but it is very expensive.
LCD projector : It is used to display video, images or data from a computer on a large screen. Its main component is a high intensity light-producing bulb and a lens.

2) Printer: There are two types of printers impact and non impact printers. Printers are used to produce hard copy.
Impact Printers : There is a mechanical contact between print head and the paper.

i) Dot Matrix Printer: Here characters are formed by using dots. The printing head contains a vertical array of pins. The letters are formed by’ using 5 dot rows and 7 dot columns. Such a pattern is called 5×7 matrix. This head moves across the paper, the selected pins fire against an inked ribbon to form characters by dot. They are capable of faster printing, but their quality is not good.

Non-impact Printers : There is no mechanical contact between print head and paper so carbon copies cannot be possible to take. They are inkjet, laser, thermal printers etc. .

a) Ink jet Printer: It works in the same fashion asdot matrix printers, but the dots are formed with tiny droplets of ink to be fired from a bottle through a nozzle. These droplets are deflected by an electric field using horizontal and vertical deflection plates to form characters and images. It is possible to generate colour output. They produce less noise1 and produce high quality printing output. The printing cost is higher. Here liquid ink is used.

b) Laser Printer: It uses photo copying technology. Here instead of liquid ink dry ink powder called toner is used. A drum coated with positively charged photo conductive material is scanned by a laser beam. The positive charges that are illuminated by the beam are dissipated. The drum is then rolled through a reservoir of negatively charged toner which is picked up by the charged portions of the drum. It adheres to the positive charges and hence creating a page image on the drum. Monochrome laser printer uses a single toner whereas the colour, laser printer uses four toners. Its print quality is good less noise and printing cost is higher.

c) Thermal Printers: It is same as dot matrix printer but it needs heat sensitive paper. It produces images by pushing electrically heated pins to the special paper. It does not make an.impact on the paper so we cannot produce carbon copies, ft produce less noise, low quality print and inexpensive. It is used in fax machine.

3. Plotter
A plotter is a device that draws pictures or diagrams on paper based on commands from a computer. Plotters draw lines using a pen. Pen plotters generally use drum or flat bed paper holders. In a drum plotter the paper is mounted on the surface of a drum. Here the paper is rotated. But in a flat bed plotter the paper does not move and the pea holding mechanism provides the motion that draws pictures. Plotters are used in engineering applications where precision is needed.

4. Three Dimensional (3D) printer: This device is used to print 3D objects.

5. Audio output devices: Speakers are used to produce sound by the backward and forward movement of the diaphragm in the speaker according to the electrical signals from the computer through the audio port.

e-Waste(electronic waste): It refers to the mal functioning electronic products such -as faulty computers, mobile phones, tv sets, toys, CFL etc.

Why should we concern about e Waste?
It contains poisonous substances such as lead, mercury, cadmium etc and may cause diseases if not properly managed.

What happens to e-Waste?
A small amount is recycled. Due to this our natural resources are contaminated(poisoned). Some of them can recycle properly. But it is a very big problem in front of the Government to collect segregate, recycle and disposal of e-Waste.

e-Waste disposal methods

• Reuse: Reusability has an important role in e-Waste management and can reduce the volume of e-Waste
• Incineration: It is the process of burning Waste at high temperature in a chimney
• Recycling of e-Waste: It is the process of making new products from this e-Waste.
• Landfilling: It is used to level pits and cover by a thick layer of soil.

Students role in e-Waste disposal

• Stop buying unnecessary electronic equipment
• Repair Faulty electronic equipment instead of buying a new one.
• Give electronic equipment to recycle
• Buy durable, efficient, quality, toxic-free, good warranty products
• check the website or call the dealer if there is any exchange scheme
• Buy rechargeable battery products

Green computing or Green IT: It is the study and practice of eco-friendly computing or IT such as designing, manufacturing, using and disposal of .computers and components (monitors, printers, storage devices etc.)
Following are some steps to follow to reduce the adverse impact on the global environment
Turn off computer and other devices when not in use ‘

• Use power saver mode
• Use laptops instead of desktops
• Avoid print outs if not needed
• Use LCD s instead of CRT s to save power
• Use Energy Star rated HA/V or S/w and Solar energy(Hybrid Energy)
• Dispose e Waste properly as per norms

Following are the steps to promote green computing
Green design: Design energy-efficient and eco-friendly devices
Green manufacturing: reduce non-eco-friendly parts while manufacturing
Green use: Use energy saver devices
Green disposal: Use easily disposable devices

Software: The set of instructions that tell the hardware how to perform a task is called software. Without software, computers cannot do anything. Two types of System s/w and Application s/w
System software:
It is a collection of programs used to manage system resources and control its operations. It is further classified into two.

• Operating System
• Language Processor

a) Operating System: It is a collection of programs which acts as an interface between user and computer. Without an operating system computer cannot do anything. Its main function is make the computer usable and use hardware in an efficient manner.
eg: Windows XP, Windows Vista, Linux, Windows 7, etc.

Major functions of an operating System
i) Process management: It includes allocation and deallocation of processes(program in execution) as well as scheduling system resources in efficient manner
ii) Memory management: It takes care of allocation and de allocation of memory in efficient manner
iii) File management: This includes organizing, naming , storing, retrieving, sharing , protecting and recovery of files.
iv) Device management: Many devices are connected to a computer so it must be handled efficiently.

b) Language Processes: We know that a program is a set of instructions. The instructions to the computer are written in different languages. They are high-level language (HLL) andjow level language. In HLL English like statements are used to. write programs. They are C, C++, COBOL, PASCAL, VB, Java etc. HLL is very easy and can be easily understood by the human being.
Low level language are classified into Assembly Language and Machine Language.
In assembly language mnemonics (codes) are used to write programs
ADD A, B A = A + B
SUB A, B A = A – B
INC A A = A + 1

In Machine Language 0’s and 1’s are used to write program. It is very difficult but this is the only language which is understood by the computer. Usually programmers prefer HLL to write programs because of its simplicity. But computer understands only machine language. So there is a translation needed. The program which perform this job are language processors.
The different language processors are given below:
1) Assembler: This converts programs written in assembly language into machine language.
2) Interpreter: This converts a HLL program into machine language by converting and executing it line by line. The first line is converted if there is no error it will be executed otherwise you have to correct it and the second line and so on.
3) Compiler: It is same as interpreter but there is a difference it translates HLL program into machine language by converting all the lines at
a time. If there is no error then only it will be executed.

II. Application Software
Programs developed to serve a particular application is known as application software.
eg: MS Office, Compression Utility, Tally etc.
Application software can further be subdivided into
three categories.

• Packages
• Utilities
• Customized Software

a) Packages: Application software that makes the computer useful for people to do every task. Packages are used to do general-purpose applications.
They are given below:
1) Word Processes : This is used for creation and modification of text documents. That means a word processor helps the people to create, edit and format a textual data with less effort and maximum efficiency. By using word processor we can change font and font size of character, change alignment (left, right, center and justify), check spelling and grammar of the whole document etc. eg: MS Word.

2) Spread Sheets: It contains data or information in rows and columns and can perform calculation (Arithmetic, Relational and logical Operation). It helps to calculate results of a particular formula and the formula can apply different cells (A cell is the intersection of a row and column. Each column carries an alphabet for its name and row is numbered). It is used to prepare budgets, balance sheets, P & L account, Payroll etc. We can easily prepare graphs and charts using data entered in a worksheet. A file is a work.book that contains one or more work sheets, eg: MS Excel is spreadsheet software.

3. Presentation and Graphics: You can present your idea with sound and visual effects with the help of presentation software by preparing slides. The application software that manipulate visual images is known as graphics software.
Eg: MS PowerPoint is a presentation package.

4. Data base package: Database is a collection of large volume of data. DBMS is a set of programs that manages the datas are for the centralized control of data such that creating new fecords to the database, deleting, records whenever not wanted from the database and modification of the existing database. Example for a DBMS is MS Access.

DTP Packages: DTP means Desk Top Publishing. By using this we can create books, periodicals, magazines etc. easily and fastly. Now DTP packages are used to create in Malayalam also, eg:-PageMaker.

b) Utilities: Utilities are programs which are designed to assist computer for its smooth functioning. The utilities are given below:

1. Text editor: It is used for creating and editing text files.
2. Backup utility: Creating a copy of files in another location to protect them against loss, if your hard disk fails or you accidentally overwrite or delete data.
3. Compression Utility: It is used to reduce the , size of a file by using a program and can be restored to its original form when needed.
4. Disk Defragmenter: It is used to speeds up disk access by rearranging the files that are stored in different locations as fragments to contiguous memory and free space is consolidated in one contiguous block.
5. Virus Scanner: It is a program called antivirus software scans the disk for viruses and removes them if any virus is found.

c) Specific purpose software (Customized software): It is a collection of programs which are developed to meet user needs to serve a particular application. It is also called tailor-made software.

Free and open source software: Here “free” means there is no copy right or licensing. That is we can make copies of the s/w or modify the source code without legal permission of its vendor (creator) we can use and distribute its copy to our friends without permission. That is Freedom to use ,to modify and redistribute.
The Four freedoms are

• Freedom 0: To run program for any purpose
• Freedom 1: To study how it works and allows you to adapt according to your needs. Also allows accessing source code.
• Freedom 2: Allows to take copies and distribute
• Freedom 3: Allows you to change source code and release the program.

Examples for Free and open source software are given below
Linux: it is a free s/w. If was written by Linux Trovalds at the University of Helsinki. It is a GUI and multi-user, multi-tasking O.S. with many more other features. It is also independent of the hardware. It is used by ISP’s, programmers who uses Java to Write program, etc. The main Linux distributors are. Open Linux Red hat, Debian, Gnu Linux, etc…

GNU/Linux: It was organized by Richard Stallman in 1983

GIMP (GNU Image Manipulation Program): It is a very helpful software to perform all the activities to an image.

Mozilla Firefox: This web browser helps users to browse safely.

OpenOffice.org: This package contains different s/w s that help the users to draft letters neatly by using “Writer”, perform calculations by using “Calc” and prepare presentations by using “Impress”. It is platform-independent (That means it works on both Linux and Windows platfprms.

Freeware: A s/w with Copy right is available free of cost for unlimited use.

Shareware: It is an introductory pack distributed on a trial basis with limited functionality and period.

Students can Download Chapter 1 Fundamentals of Computer Notes, Plus One Computer Application Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Notes Chapter 1 Fundamentals of Computer

Data and Information
Data: It represents raw facts and figures. It may be a number, string(combination of characters), etc.
Eg: Alvis, 6, First
Information: It is meaningful and processed form of data
Eg: Alvis aged 6 years is in first standard.

Data Processing: Data processing is defined as a series of actions or operations that converts data into useful information.
Data processing phases (6)

1. Capturing data – In this step acquire or collect data from the user to input into the computer.
2. Input – It is the next step. In this step appropriate data is extracted and feed into the computer.
3. Storage – The data entered into the computer must be stored before starting the processing.
4. Processing/Manipulating data – It is a laborious work. It consists of various steps like computations, classification, comparison, summarization, etc. that converts input into output.
5. Output of information – In this stage, we will get the results as information after processing the data.
6. Distribution of information – In this phase the information(result) will be given to the concerned persons/computers.

Functional units of computer
A computer is not a single unit but it consists of many functional units(lntended to perform jobs) such as Input unit, Central Processing Unit(ALU and Control Unit), Storage (Memory) Unit and Output Unit.
1. Input Unit: Its aim is to supply data (Alphanumeric, image , audio, video, etc.) to the computer for processing. The Input devices are keyboard, mouse, scanner, mic, camera, etc

2. Central Processing Unit (CPU): It is the brain of the computer and consists of three components
Arithmetic Logic Unit(ALU) – As the name implies it performs all calculations and comparison operations.
Control Unit(CU) – It controls the overall functions of a computer.
Registers – It stores the intermediate results temporarily.

3. Storage Unit(Memory Unit): A computer has huge storage capacity. It is used to store data and instructions before starts processing. Secondly, it stores the intermediate results and thirdly it stores information(processed data), that is the final results before send to the output unit(Visual Display Unit, Printer, etc)

Two Types of the storage unit
i. Primary Storage alias Main Memory: It is further be classified into Two- Random Access Memory(RAM) and Read-Only Memory(ROM). The one and only memory that the CPU can directly access is the main memory at a very high speed. It is expensive hence storage Capacity is less. RAM is volatile (when the power is switched off the content will be erased) in nature but ROM is non-volatile (It is permanent)

ii. Secondary Storage alias Auxiliary Memory: Because of the limited storage capacity of primary memory its need arises. When a user saves a file, it will be stored in this memory hence it is permanent in nature and its, capacity is huge.
Eg: Hand Disc Drive(HDD), Compact Disc(CD), DVD, Pen Drive, Blu Ray Disc etc.

4. Output Unit: After processing the data we will get information as result, that will be given to the end user through the output unit in a human-readable form. Normally monitor and printer are used.

Computer: It is an electronic machine used to perform tasks based upon set of instructions and produce results at a high degree of accuracy and speed.
Advantages of computer:

1. Speed – It can perform operations at a high speed.
2. Accuracy – It produces result at a high degree of accuracy.
3. Diligence – Unlike human beings, a computer is free from monotony, tiredness, Jack of concentration etc. We know that it is an electronic machine. Hence it can work hours without making any errors.
4. Versatility – It is capable of performing many tasks. It is useful in many fields.
5. Power of Remembering – A computer consists of huge amount of memory. So it can store and recall any amount of information without delay. Unlike human beings it can store huge amount of data and can be retrieved whenever the need arises.

Disadvantages of computer

1. No. IQ: It has no intelligent quotient. Hence they are slaves and human beings are the masters. It can’t make its own decisions.
2. No feelings: Since they are machines they have no feelings and instincts. They can perform tasks based upon the instructions given by the humans (programmers).

Number System: It is a systematic way to represent numbers in different ways. Each number system has its own Base, that is a number and that number of symbols or digits used.
The various number systems are given below:
Most Significant Digit (MSD): The digit with the most weight is called MSD. MSD is also called Left Most Digit(LMD)

Least Significant Digit (LSD): The digit with the least weight is called LSD. LSD is also called Right Most Digit(RMD)
Eg:
1) 106 : Here MSD : 1 and LSD : 6
2) 345.78: Here MSD : 3 and LSD : 8
A Binary Digit is also called a bit.
The weight of each digit of a number can be represented by the power of its base.

Number conversions
In general, to convert a decimal number into another number system(binary or octal or hexadecimal) do the following
Divide the number successively by the base of the number system do you want to convert and write down the remainders from bottom to top.
To convert a decimal fraction into another number system .multiply the number by the base of the number system do you want to convert then integer part and fractional part are separated again multiply the fractional part by the base and do the steps repeatedly until the fractional part becomes zero. Finally, write down the integer part from top to bottom.

Decimal to Binary: Divide the number by the base 2 successively and write down the remainders from bottom to top.

Decimal fraction to binary
multiply the number by the base 2 then the integer part and fractional part are separated again multiply the fractional part by the base 2 and do the steps repeatedly until the fractional part becomes zero.
Finally, write down the integer part from top to bottom.

Decimal to Octal: Divide the number by the base 8 successively and write down the remainders from bottom to top.

Decimal fraction to octal
multiply the number by the base 8 then integer part and fractional part are separated again multiply the fractional part by the base 8 and do the steps repeatedly until the fractional part becomes zero.
Finally write down the integer part from top to bottom.

Decimal to Hexadecimal: Divide the number by the base 16 successively and write down the remainders from bottom to top.

Decimal fraction to hexadecimal
multiply the number by the base 16 then integer part and fractional part are separated again multiply- the fractional part by the base 16 and do the steps repeatedly until the fractional part becomes zero. Finally write down the integer part from top to bottom.

Converting a number from any number system into decimal: For this multiply each digit by its corresponding weight and sum it up.

Binary to decimal conversion: For this multiply each bit by its corresponding weight and sum it up. The weights are power of 2.

Octal to decimal conversion: For this multiply each bit by its corresponding weight and sum it up. The weights are the power of 8.

Hexadecimal to decimal conversion: For this multiply each bit by its corresponding weight and sum it up. The weights are the power of 16.

Octal to binary conversion: Convert each octal digit into its 3-bit binary equivalent.
Consider the following table

Hexadecimal to binary conversion: Convert each Hexadecimal digit into its 4-bit binary equivalent.
Consider the following table

Binary to octal conversion
Divide the binary number into groups of 3 bits starting from the right to left(But in the fractional part start dividing from left to right). Insert necessary zeros in the left side(or right side in the case of fractional part)if needed and write down the corresponding octal equivalent.
Eg: (10100110)₂= ()₈?
Insert one zero in the left side to form 3 bits group

Binary to Hexadecimal conversion
Divide the binary number into groups of 4 bits starting from the right to left (But in the fractional part start dividing from left to right). Insert necessary zeros in the left side(or right side in the case of fractional part) if needed and write down the corresponding Hexadecimal equivalent.
Eg: (100100110)₂ = ()₁₆?
Insert 3 zeros in the left side to form 4 bits group

Octal to Hexadecimal conversion
First, convert an octal number into binary, then convert this binary into hexadecimal
Eg: Convert (67)₈ = ( )₁₆
Step I. First, convert this number into the binary equivalent for this do the following:

Step II. Next, convert this number into the hexadecimal equivalent for this do the following.

So the answer is (67)₈ = (37)₁₆

Hexadecimal to octal conversion
First convert Hexadecimal to binary, then convert this binary into 0ctal
Eg: Convert (A1)₁₆ = ()₈?
Step I. First convert this number into the binary equivalent. For this do the following

Step II. Next convert this number into octal equivalent. For this do the following.
So the answer is (A1)₁₆ = (241)₈

Data representation: The data stored in the computer memory is in the form of binary.

Representation of integers
There are three ways to represent integers on computers. They are as follows:

1. Sign and Magnitude-Representation (SMR)
2. 1’s Complement Representation
3. 2’s Complement Representation

1) SMR: Normally a number has two parts sign and magnitude.
eg: Consider a number +5. Here + is the sign and 5 is the magnitude. In SMR the Most Significant Bit (MSB) js used to represent the sign. If MSB is 0 sign is +ve and MSB is 1 sign is -ve.
eg: If a computer has word size is 1 byte then +5 is represented as 0 0 0 0 0 1 0 1
-5 is represented as 1 0 0 0 0 1 0 1
Here MSB is used for a sign then the remaining 7 bits are used to represent magnitude. So we can represent 27 = 128 numbers. But there are negative and positive numbers. So 128 + 128 = 256 number. The numbers are 0 to +127 and 0 to -127. Here zero is repeated. So we can represent 256 – 1 = 255 numbers.

2) 1’s Complement Representation: To get the 1’s complement of a binary number, just replace every 0 with 1 and every 1 with 0. Negative numbers are represented using 1’s complement but +ve number has no 1’s complement.
eg: To find the 1 ’s complement of -21 + 21 = 0 0 0 1 0 1 0 1
To get the 1’s complement change all 0 to 1 and all 1 to 0.
-21 = 11101010
1’s complement of -21 is 1 1 1 0 1 0 1 0
Eg: 2) Find the 1’s complement of +21
Positive numbers are represented by using SMR.
+21 = 0 0 0 1 0 1 0 1 (No need to take the 1’s complement)

3) 2’s Complement Representation: To get the 2’s complement of a binary number, just add 1 to its 1’s complement +ve number has no 2’s complement.
eg:- To find the 2’s complement of -21
+21 = 0 0 0 1 0 1 0 1
First take the 1 ’s complement for this change all 1 to 0 and all 0 to 1
-21 = 1 1 1 0 1 0 1 0
Then add 1 = 1 1 1 0 1 0 1 1
2’s complement of -21 is 1 1 1 0 1 0 1 1

b) Representation of floating point numbers.
A real number consists of an integer part and fractional part and represent by using Exponent and Mantissa method. This method is also used to represent too big numbers as well as too small numbers.
Eg: .0000000000000000000000001 can be represented easily as 1 × 10-25. Here 1 is the Mantissa and -25 is the exponent.
A computer with 32 bit word length is used 24 bits for mantissa and the remaining 8 bits used to store exponent.
1. Representation of characters,
a) ASCII(American Standard Code for Information Interchange): It is 7 bits code used to represent alphanumeric and some special characters in computer memory. It is introduced by the U.S. government. Each character in the keyboard has a unique number.
Eg: ASCII code of ‘a’ is 97, when you press ‘a’ on the keyboard, a signal equivalent to 1100001 (Binary equivalent of 97 is 1100001) is passed to the computer memory. 27 = 128, hence we can represent only 128 characters by using ASCII. It is not enough to represent all the characters of a standard keyboard.

b) EBCDIC(Extended Binary Coded Decimal Interchange Code): It is an 8 bit code introduced by IBM(International Business Machine). 28 = 256 characters can be represented by using this.

c) ISCII(Indian Standard Code for Information Interchange): It uses 8 bits to represent data and introduced by the standardization committee and adopted by the Bureau of Indian Standards(BIS).

d) Unicode: The limitations to store more characters is solved by the introduction of Unicode. It uses 16 bits so 216 = 65536 characters (i.e, world’s all written language characters) can store by using this.

Representation of audio, image, and video: Various methods are used to represent an image, audio and video data. A file (image or audio or video) consists of two parts header information (such as file name, its size, format etc.) and image data(a compressed form of value pixels intensity). Image file formats are JPEG (Joint Picture Experts Group) Format, BMP (Bitmap), TIFF (Tagged Image File Format), GIF(Graphics Interchange Format), PNG (Portable Network Graphic).
Audio File formats are WAV,MP3,MIDI,AIFF etc.
Video File formats AVI, JPEG2, WMV etc.

Students can Download Chapter 10 IT Applications Questions and Answers, Plus One Computer Application Chapter Wise Questions and Answers helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Chapter Wise Questions Chapter 10 IT Applications

Plus One Computer Application IT Applications 1 Mark Questions and Answers

Question 1.
Name the application of Information and Communication Technology (ICT) for delivering government services to the citizens in a convenient, efficient, and transparent manner.
Answer:
e-Governance

Question 2.
“e-Governance facilitates interaction between different stakeholders in governance”. Say whether the statement is True or False.
Answer:
It is true.

Question 3.
The system of financial exchange between buyers and sellers in an online environment is known as _________.

Answer:
Electronic Payment System(EPS)

Question 4.
Check whether the following statement is True or False.
“e-Business is an extension of e-Commerce”
Answer:
Yes It is True.

Question 5.
Real time exchange of text messages between two or more persons over Internet is termed as _____.
Answer:
Online chat

Question 6.
Pick the odd one out
a) e- Book Reader
b) e-Text
c) Television channels
d) e-Business
Answer:
c) e-Business, the others are e-Learning tools

Question 7.
Define e-Text.
Answer:
The electronic form&t of textual data is called e- Text. It can be read aloud by an e-Text reader device that will help the visually challenged people.

Question 8.
Give an example for e-Learning tool.
Answer:
Electronic Books Reader

Question 9.
Name an electronic device using which we can easily read e-Text.
Answer:
e-Book reader

Question 10.
Write the full forms of BPO and KPO.
Answer:
BPO is Business Process Outsourcing KPO is Knowledge Process Outsourcing

Question 11.
Name any two e-Learning tools.
Answer:
1) e-Book Reader
2) Online chat

Question 12.
The system used for financial exchange between buyers and sellers in a online business is _____
a) electronic business online
b) electronic payment system
c) business process outsourcing
d) online payment system
Answer:
b) Electronic Payment System

Question 13.
Online railway reservation is an example of _____.
a) e-Business
b) e-Rail
c) e-Governance
d) e-Leaming
Answer:
e-Governance

Question 14.
Which one of the following is NOT an e-business website?
a) www.amazon.com
b) www.dhsekerala.gov.in
c) www.keralartc.com
d) www.irtc.com
Answer:
b) www.dhsekprala.gov.in

Question 15.
In ICT enabled services BPO stands for _____.
Answer:
Business Process Outsourcing

Question 16.
Application of ICT for delivering government services to citizens in a convenient and transparent manner is called_______.
Answer:
e- Governance

Plus One Computer Application IT Applications 2 Marks Questions and Answers

Question 1.
Define the term e-Governance.
Answer:
The integration of computers and communication technology for the benefit of government functions to#the public is termed as E-Governance by this Govt can serve the public in a convenient, efficient and transparent manner.

Question 2.
Give an example for e-Governance website.
Answer:
m www.hscap.kerala.gov.in, This site is used to manage +2 admission (Ekajalakam or Single Window System)

Question 3.
What is KSWAN?
Answer:
It is envisaged to be the core common network infrastructure for e-Governance and the State Information Infrastructure(SII), connecting Thiruvananthapuram, Kochi and Calicut. It acts as backbone of SII.

Question 4.
Define e-Business
Answer:
It is Electronic business. It provides services or running business through internet is called E business

Question 5.
Define e-Banking.
Answer:
Doing all the banking activities at any time and place through internet. We can check the balance amount, transfer money from our a/c to another a/c at any time and location. We can sit our home or any place and conduct banking activities hence it is very convenient to the public.

Question 6.
Write down the functions of call centres.
Answer:
Call centre is a third party company and its main aim is to serve the public for the payment of bills, purchase of goods, doubt clearance, etc. Here Telephone facility is set up to handle incoming and out going calls about goods or service for an organisation.

Plus One Computer Application IT Applications 3 Marks Questions and Answers

Question 1.
List out different types of interactions in e-Governance.
Answer:
The integration of computers and communication technology for the benefit of government functions to the public is termed as E-Govemance.
Types of interactions in e-Governance is given below

• Government to Government(G2G): Electronically exchanging data or information among Government agencies, departments or organizations. Government to Citizens(G2C): Exchange of information between
• Government and Citizens Government to Business(G2B) : Interaction between the Government and
• Business men. Government to Employees(G2E) : The exchange of information between Government and its employees

Question 2.
Differentiate between BPO and KPO.
Answer:
BPO means Business Process Outsourcing: A business firm’s main aim is to increase the profit by reduce the expenditure for this some works are transferred to other contractors(man power supply company common in other countries). The parent company is not responsible to such employees but the work will be carried out smoothly. Knowledge Process Outsourcing(KPO): It is similar as BPO but the main job in KPO is knowledge and information related that is carried out by a third party company

Question 3.
What are the advantages of e-Governance?
Answer:
The advantages of e-Governance is given below Its main aim is to provide better service to the people at any time and place with high speed. In the modern world it is very helpful and convenient to the people.

• It enables automation of Govt, services .
• It ensures the participation of citizens hence strengthen the democracy
• It ensures more transparency hence eliminates corruption
• It enhances responsibilities of various Govt. Departments
• Its proper implementation saves time and money of the people by avoiding unnecessary visits to offices,

Question 4.
What are the duties of Akshaya?
Answer:
These were launched in 2002 in the Malappuram Dist.ln Kerala by the project of Kerala State Information Technology Mission(KSITM). Its aim is to provide services such as e-grants, e filing, e district, e ticketing,/ation card application, Voters Id application,New Vehicles Registration application, insurance and Banking to the peoples of Kerala.

Question 5.
What is Common Service Center(CSC)? List some of the services offered through CSC.
Answer:
Common Service Centres are the web enabled points of the government, private and social sector services. They provide services such as Agriculture, Health, Banking, Educational, Entertainment, Commercial, Transport services for the rural citizens of India. In Kerala Akshaya centers are working as CSC.

Question 6.
What are the major challenges faced in the implementation of e-Learning?
Answer:
Following are the challenges to e Learning

• Face to face contact between student and teachers is not possible
• Proper interaction is limited lack of infrastructure facilities
• Its implementation requires computer and high speed Internet
• Pupil may not get proper motivation
• It does not provide a real lab facility

Question 7.
a) Explain the term, ICT.
b) Briefly explain the advantages of implementing e-Governance.
Answer:
a) Information and Communication Technology .
b) The advantages of e-Govemance is given below Its main aim is to provide better service to the people at any time and place with high speed. In the modern world it is very helpful and convenient to the people.

• It enables automation of Govt, services.
• It ensures the participation of citizens hence strengthen the, democracy
• It ensures more transparency hence eliminates corruption
• It enhances responsibilities of various Govt. Departments
• Its proper implementation saves time and money of the people by avoiding unnecessary visits to offices.

Question 8.
Remya has got a job at a call center. What is a call center? What kind of job does a call center provide?
Answer:
Call centre is a third party company and its main aim is to serve the public for the payment of bills, purchase’of goods, doubt clearance, etc. Here Telephone facility is set up to handle incoming and out going calls about goods or service for an organisation

Question 9.
Explain any three e-learning tools,
Answer:
e Learning tools

• Electronic books reader(e Books): With the help of a tablet or portable computer or any other device we can read digital files by using a s/w is called electronic books reader.
• e text: The electronic format of textual data is called e-Text.
• Online chat: Real time exchange of text or audio or video messages between two or more person over the Internet.
• e Content : The data or information such as text, audio, video , presentations, images, animations etc, are stored in electronic format.
• Educational TV channels : TV channels dedicated only for the e-Learning purpose :
  Eg-. VICTERS (Virtual Class room Technology on Edusat for Rural Schools OR Versatile ICT Enabled Resources for Students)

Question 10.
Define e-Governance. Write any four advantages of e-Governance.
Answer:
E-Governance
The integration of computers and communication technology for the benefit of government functions to the public is termed as E-Governance by this Govt can serve the public in a convenient, efficient and transparent manner.

Benefits of E-Governance : Its main aim is to provide better service to the people at any time and place with high speed. In the modern world it is very helpful and convenient to the people.

• It enables automation of Govt.services.
• It ensures the participation of citizens hence strengthen the democracy.
• It ensures more transparency hence eliminates corruption.
• It enhances responsibilities of various Govt Departments.
• Its proper implementation saves time and money of the people by avoiding unnecessary visits to offices.

Question 11.
i) Which of the following system in e-Business . exchanges money between buyer and seller?
a) Automatic Teller Machine
b) Electronic Payment System
c) Payment Service System
d) Financial Data Center.
ii) e-Governance provide a lot of government services to citizens through ICT. What are the different categories of e-Governance interactions?
Answer:
i) b) Electronic Payment System
ii) Types of interactions in e-Governance e-Governance facilitates interaction between different stakeholders in governance .
Government to Government(G2G): Electronically exchanging data or information among Government agencies, departments or organizations.
Government to Citizens(G2C): Exchange information between Government and Citizens .
Government to Business(G2B) : Interaction’ between the Government and Business men.
Government to Employees(G2E) : The exchange of information between Government and its employees

Question 12.
Explain any three tools that enhance e-Learning process.
Answer:
e Learning tools

• Electronic books reader(e Books): With the help of a tablet or portable computer or any other device we can read digital files by using a s/w is called electronic books reader.
• e text: The electronic format of textual data is called e-Text.
• Online chat: Real time exchange of text or audio or video messages between two or more person over the Internet.
• e Content : The data or information such as text, audio, video , presentations, images, animations etc, are stored in electronic format.
• Educational TV channels : TV channels dedicated only for the e-Learning purpose : Eg. VICTERS (Virtual Class.room Technology on Edusat for Rural Schools OR Versatile ICT Enabled Resources for Students).

Question 13.
Compare the advantages and disadvantages of implementing e-Business.
Answer:
Advantages of E-business is given below

• It overcomes geographical limitations
• It reduces the operational cost
• It minimizes the time and cost
• It remains open all the time
• We can locate the product faster from a wider range of choices

Disadvantages of E-business is given below

• Peoples are unaware of IT applications and its uses
• Most peoples don’t have plastic money(credit / debit card) and net banking
• It requires high security measurements otherwise you may lose money
• We can’t touch or smell products through online
• Some companies may not have proper Goods delivery service.

Plus One Computer Application IT Applications 5 Marks Questions and Answers

Question 1.
Compare the advantages and disadvantages of implementing e-Business?
Answer:
Advantages of e business is given below

• It overcomes geographical limitations
• It reduces the operational cost
• It minimizes the time and cost
• It remains open all the time
• We can locate the product faster from a wider range of choices

Disadvantages of E business is given below:

• Peoples are unaware of IT applications and its uses
• Most peoples don’t have plastic money(credit / debit card) and net banking
• It requires high security measurements otherwise you may lose money
• We can’t touch or smell products through online
• Some companies may not have proper Goods delivery service

Question 2.
Explain any three IT enabled services in detail.
Answer:
1) Call centre : It is a third party company and its main aim is to serve the public for the payment of bills, purchase of goods, doubt clearance, etc. Here Telephone facility is set up to handle incoming and out going calls about goods or service for an organisation.
2) Teleconferencing : It is a Way of conferring, discussing or communicating by audio and video circuits, by a group of people located in geographically distributed areas. There are two types of conferencing video and audio. In audio conferencing the participants can’t see each other but only hear voices of one another.
3) Video conferencing : It is a type of Teleconferencing. The participants can see each other live on screen and can speak to each other with the help of teleconferencing. They must be sit in conference rooms connected through a teleconference system(A video camera and a speaker phone are connected to a computer with Internet connection)

Question 3.
Discuss in detail various uses of IT in health care field.
Answer:
In the field of medicine and health care computers play very important role. Such as diagnosing diseases, monitoring patients during surgery etc.

1) Medical equipments : Most of the medical equipments such as CT scanner, MRI scanner, Ultra Sound scanner, ECG, ECHO test, TMT, etc work with the help of computers

2) Electronic Medical Record(EMR): It is a digital version of a paper chart that contains all of a patient’s medical history from one practice. An EMR is mostly used by doctors fordiagnosis and treatment.

3) Web based support / diagnosis : Internet is used by the doctors to acquire information to diagnose and give treatment to the patients who are suffering from diseases.

4) Telemedicine : With the help of TeleMedicine equipment doctors and nurses can examine patients in remote locations by monitoring the patient conditions such as BP, temperature etc. and give the correct medical treatment. Tele medicine is implemented with a telephone line and a computer.

5) Research and development: Computers play inevitable role in almost every branch of science and engineering. The role of computers in different fields of research and development is unavoidable. The most complex genetic problem may evaluated with the help of computers easily and can simulate actual system using a computer. The computers help in diagnosis, treatment of patients and better running of hospitals.

Students can Download Chapter 9 Internet Questions and Answers, Plus One Computer Application Chapter Wise Questions and Answers helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Chapter Wise Questions Chapter 9 Internet

Plus One Computer Application Internet 1 Mark Questions and Answers

Question 1.
A network of smaller networks that exists all over the world is called _______.
Answer:
Internet

Question 2.
ARPANET means ______.
Answer:
Advanced Research Projects Agency Network.

Question 3.
Odd one out.
a) Internet explorer
b) Mozilla
c) Netscape navigator
d) Windows explorer
Answer:
d) Windows explorer, the others are browsers.

Question 4.
Odd man out.
a) Word
b) Excel
c) Power Point
d) Mosaic
Answer:
d) Mosaic. It is a browser, others are MS Office packages.

Question 5.
The interface between user and computer hardware is called operating system then what about the interface between user and internet (www)?
Answer:
Browser.

Question 6.
With the help of this the user can search informations provided on the internet. What is it ?
Answer:
Browser .

Question 7.
Benhur wants to navigate through the web pages from the following which will help him?
a) A browser
b) MS Word
c) Tally
d) Paint
Answer:
a) A browser.

Question 8.
I am a piece of software. With the help of me a user can search information from the internet and navigate through the web pages. Who am I ?
Answer:
Browser.

Question 9.
Anil told you that he was browsing at that time. From the following choose the right one.
a) He was visiting a website
b) He was reading a book
c) He was watching TV
d) He was sleeping.
Answer:
a) He was visiting a website. The process of visiting a website is called browsing.

Question 10.
_____ is a popular browser commonly used in windows operating system.
a) Mozilla
b) Netscape navigator
c) Mosaic
d) Internet explorer
Answer:
d) Internet Explorer.

Question 11.
_____ browser is commonly used in Linux.
a) Internet explorer
b) Moziila
c) Netscape navigator
d) Mosaic
Answer:
b) Moziila.

Question 12.
Mr. Asokan wants to go the previous page. From the following which option will help him?
a) Back button
b) Refresh
c) Favorites
d) Stop
Answer:
a) Back button.

Question 13.
While navigating through a website, sita wants to go back to the home page. From the following which will heip her ?
a) Refresh
b) Search
c) Home
d) Mail
Answer:
c) Home.

Question 14.
While surfing a website, Joyson.wants to play music or video. Which button will help him?
a) Home
b) Search
c) Media
d) Mail
Answer:
c) Media.

Question 15.
Aumima wants to know the websites that her brother had visited last week? From the following which will help her?
а) Media
b) History
c) Mail
d) Search
Answer:
b) History .

Question 16.
While browsing, the internet connection is lost so you want to reload the web page. Which will help for this?
a) Refresh
b) Stop
c) Media
d) Edit
Answer:
a) Refresh.

Question 17.
The address bar is also known as ______.
а) URL
b) UDL
c) KRL d)
None of these
Answer:
a)URL.

Question 18.
You want to add and organize a website to a list. Which will help for this?
a) Favorites
b) search
c) Back
d) mail
Answer:
a) Favorites.

Question 19.
How can it possible to understand that the browser is retrieving data?
a) Access indicator icon animates
b) From the refresh button
c) From the back button
d) None of these
Answer:
a) Access indicator icon animates.

Question 20.
The progress of the data being downloaded indicates by the _______.
a) Address bar
b) Progression bar
c) Status bar
d) None of these
Answer:
c) Status Bar.

Question 21.
Baby wants to download a file. The time needed for that depends on the _______ of the file.
a) Size
b) Place
c) Type
d) None of these
Answer:
a) Size.

Question 22.
the following which option will help him for that?
a) Copy
b) Page setup
c) Search
d) Media
Answer:
Page setup.

Question 23.
Mr. Franco’s e-mail id is [email protected]. He wants to connect this page fastly. From the following which will help him.
a) Favorite
b) Search
c) Refresh
d) Media
Answer:
a) Favorite.

Question 24.
Mrs. Janaki purchased a product through online and payment was given by credit card. She wants to protect the information about the credit card. How can it be possible from the following?
а) Security
b) Favorite
c) Media
d) Content
Answer:
a) Security.

Question 25.
Odd man out.
a) www.google.com
b) www.yahoo.com
c) www.altavista.com
d) www.stmaryshss.com
Answer:
d) www.stmaryshss.com, the others are search engines.

Question 26.
Alvis got email about some products without his consent. Which type of email is this ?
Answer:
Spam.

Question 27.
What is the primary thing you have needed to sent an email to your friend?
Answer:
You have need an email id (address).

Question 28.
There is a PTA meeting in your school in the next month. The school authorities want to send the in-vitation to the parents. Which field of the message structure will help for this?
Answer:
CC or bcc.

Question 29.
You want to send an invitation to your friends. But the friends should not know that the same invitation is send by you to others also. Which field of the message structure will help you?
Answer:
bcc.

Question 30.
Mr. Lijo wants to send his photograph to his friend by email. Which feature will help him for this?
Answer:
Attachment feature.

Question 31.
You got some pictures pf Jesus Christ through email from one of your friends. You want to send this pic-tures to your brother. What button will help you for this?
Answer:
Forward button .

Question 32.
You got an email from your father working abroad. You want to send an email without typing his email id. Which button will help you for this?
Answer:
Reply button.

Question 33.
You got an email from an Insurance Company you want to store their email id which feature will help you for this?
Answer:
We can add address to Address Book.

Question 34.
Who proposed the idea of www.
Answer:
Tim Berners Lee.

Question 35.
The protocol for internet communication is
Answer:
TCP/IP protocol.

Question 36.
A short distance wireless Internet access method is
Answer:
Wi-Fi.

Question 37.
Give an example for an e-mail address.
Answer:
[email protected].

Question 38.
Which of the following is not a search engine ? (roses a<6)3S3(oro)1§36ffi(0)1(o8 search engine ©ragpero®”nflxra?
a) Google
b) Bing
c) Facebook
d) Ask
Answer:
c) Facebook

Question 39.
Name the protocol used for e-mail transmission across Internet.
Answer:
Simple Mail Transfer Protocol(SMTP).

Question 40
Name three services over Internet.
Answer:
1 www, search engine, E-mail.

Question 41.
Each document on the web is referred using ______.
Answer:
Uniform Resource Locator(URL).

Question 42.
The small text files used by browsers to remember our email id’s, user names, etc are known as _______.
Answer:
Cookies.

Question 43.
The act of breaking into secure networks to destroy data is called hacking.
Answer:
Black hats.

Question 44.
Who introduced the term, www?
Answer:
Tim Berners Lee.

Question 45.
_________ is a software used for removing worms and trojans.
Answer:
Anti virus.

Question 46.
Which among the following communication technologies is the slowest ?
a) Bluetooth
b) Wi-Fi
c) Wi-MAX
d) Satellite link
Answer:
a) Bluetooth (upto 1 Mbps).

Question 47.
Consider the relation given below.
Social network : facebook.com. Which among the following share a similar relationship as the above?
a) micro blog : blogger.com
b) social blog : twitter.com
c) Content community: youtube.com
d) internet forum : linkedin.com
Answer:
c) content community : youtube.com.
OR
b) Social blog : twitter.com .

Question 48.
Pick the odd one out
a) Virus
b) Trojan horse
c) Wikis
d) Worm
Answer:
c) Wikis.

Question 49.
Pick the odd one out.
a) Wikis
b) Face book
c) Twitter
d) e-mail
Answer:
d) e-mail.

Question 50.
Who is known as the father of Internet?
a) Vint cerf
b) Charles Babbage
c) Tim Berners Lee
d) Alan Turing
Answer:
a) Vint cerf.

Question 51.
Who proposed the idea of World Wide Web?
Answer:
Tim Berners Lee.

Question 52.
Which one of the following is NOT a web browser?
a) Mozilla Firefox
b) Google
c) Internet Explorer
d) Opera
Answer:
b) Google. It is a search engine.

Question 53.
Which one of the following is NOT a search engine?
a) Google
b) Bing
c) Face Book
d) Ask
Answer:
c) Face book.

Question 54.
Which one of the following statement is NOT true about e-mail?
a) E-mail is environment friendly as it do not use paper.
b) E-mail provides provision to attach text, audio, video and graphics.
c) E-mail will not spread any kind of viruses.
d) E-mail can be used to send same message to many recipients simultaneously.
Answer:
c) E-mail will not spread any kind of viruses.

Plus One Computer Application Internet 2 Marks Questions and Answers

Question 1.
What is a browser ?
Answer:
A browser is a piece of software that acts as an interface between the user and the internal working of the internet. With the help of a browser the user can search information on the internet and it allows user to navigate through the web pages. The different browsers are

• Microsoft internet explorer
• Mozilla
• Netscape Navigator
• Mosaic
• Opera

Question 2.
While walking on the road, Simran saw a notice board contains a text “Browsing” in front of a shop. What is Browsing?
OR
Roopa’s mother told you that Roopa is browsing in her room. What is browsing?
Answer:
The process of visiting the websites of various companies, organization, government, individuals etc is called internet browsing or surfing with the help of a browser software we can browse websites.

Question 3.
How can we know that the browser is working or not ?
Answer:
The access indicator icon on the right corner of menu bar animates (rotates), when the browser is retrieving data or working. It is static when the browser is not working.

Question 4.
Mr. Anirudhan wants to visit the website of Manorama. Their website address is www. manoramaonline.com. How can it be possible?
Answer:
To visit the website of manorama. Anirudhan has to type “www.manoramaonline.com” in the address bar and press the enter key or use the go button. Then the home page of manorama will display. Sometimes while typing the website address on the browser automatically searches and display the home page.

Question 5.
The education Dept, of Govt, of Kerala declared SSLC results and it is available on the internet your friend wants to save the result in his computer. Help him to do so.
Answer:
To save the result in his computer to a file by using the ‘save’ or’ save as’ option of the file menu. When click this option a dialog box will appear then specify the folder whereas the file has to be saved using the dialog box and click OK. To save an image right click on the image, a pop up menu will appear then choose the save option give a name and press OK.

Question 6.
Discuss the steps to download a file from the website.
Answer:
To download a file from the website click on the link or button provided in the web page, then a dialog box will display. Enter the file name and specify the folder to which the file is to be saved. Then click save button then a window showing the progress of the downloading.

Question 7.
What is a Spamming?
Answer:
Sending an email without recipient’s consent to pro-mote a product or service is called spamming. Such an email is called a spam.

Question 8.
What do you mean by an ‘always on’ connection?
Answer:
Wired broadband connection is called ‘always on’ connection because it does not need to dial and connect

Question 9.
What is a blog?
Answer:
Conducting discussions about particular subjects by entries or posts. The posts appeared in the reverse chronological order means the most recent post appears first.
Eg. Blogger.com, WordPress.com, hsslive.com etc,

Question 10.
What do you mean by phishing..
Answer:
It is an attempt to get others information such as usenames, passwords, bank a/c details etc by acting as the authorized website. Phishing websites have URLs and home pages similarto their original ones • and mislead others , it is called spoofing.

Question 11.
What is quarantine?
Answer:
When you start an anti virus program and if any fault found it stops the file from running and stores the file in a special area called Quarantine (isolated area) and can be deleted later.

Question 12.
Compare intranet and extranet.
Answer:
A private network inside a company or organisation is called intranet and can be accessed by the company’s personnel. But Extranet allows vendors and business partners to access the company resources.

Question 13.
What are wikis?
Answer:
In this we can give our contributions regarding various topics and others can watch and edit the content. So incorrect information, advt., etc. are removed quickly.
Eg. www.wikipedia.org.

Question 14.
What is fire wall?
Answer:
It is a system that controls the incoming and out going network traffic by analyzing the data and then provides security to the computer network in an organization from other network(internet)

Question 15.
What are the advantages of Wi-Fi network?
Answer:
Line of sight between device is not required
Data transmission speed up to 57 Mbps
It can connect more number of devices
Used for communication up to 375 ft.
Nowadays this technology is used to access internet in Laptops, Desktops, tablets, Mobile phones etc.

Plus One Computer Application Internet 3 Marks Questions and Answers

Question 1.
The application form of Kerala entrance exam can be downloaded from the official website of Kerala govt. What do you mean by downloading?
Answer:
Downloading is the transfer of files or data from one computer to another usually from a server computer to a client computer. The time required to download the file depends on the size of the file.
The files may be text, graphics, program, movies, music etc. To download a file click on the link or button provided in the web page and specify the folder and filename and there is a window that shows the progress of the file being downloaded.

Question 2.
To apply minority scholarship, a student has to enter his details online, take a printout of this web page then send the application form with this printout to the authorities. Explain how to take a printout of a web page ?
Answer:
To print a web page either select the print command from file menu or use the print button on the standard tool bar. Page setup option is provided in the file menu. It helps to specify the paper size, margins header and footer and also the page orientation. The print preview option helps .to view how the page will look after printing.

Question 3.
Mr. Franco’s e-mail id is [email protected]. He wants to connect this page fastly and he visited regularly. How can it possible?
Answer:
Mr. Franco regularly visited this site to visit this site he has to type the address repeatedly every time. It is a laborious work and it can be avoided if he marks the particular address as favorite. A favorite is a link to a web page. So that he can access that page faster. To do this click add to favorite option then a dialog box appears that asks for a name for the favorite. To make the web page available offline, then ‘Make available offline’ option has to be checked.

Question 4.
Match the following

Answer:
1) f
2) a
3) e
4) b
5) d
6) c

Question 5.
Noby accessing internet by using a dial up connection and manu using a direct connection. What is the difference between these two?
Answer:
There are two ways to connect to the internet. First one dialing to an ISP’s computer or with a direct connection to an ISP.

1) Dial up Connection : Here the internet connection is established by dialing into an ISP’s computer and they will connect our computer to the internet. It uses Serial Line Internet Protocol (SLIP) or Point to Point Protocol (PPP). It is slower and has a higher error rate.

2) Direct connection : In direct connection there is a fixed cable or dedicated phone line to the ISP. Here it uses ISDN (Integrated Services Digital Network) a high speed version of a standard phone line. Another method is leased lines that. uses fibre optic cables. Digital Subscribers Line (DSL) is another direct connection, this uses copperwires instead of fibre optic for data transfer. Direct connection provides high speed internet connection and error rate is less.

Question 6.
Explain the different steps happened in between user’s click and the page being displayed.
Answer:
1) The browser determines the URL selected.
2) The browser asks the DNS for URLS corresponding IP address (Numeric address)
3) The DNS returns the address to the browser.
4) The browser makes a TCP connection using the IP address.
5) Then it sends a GET request for the required file to the server.
6) The server collects the file and send it back to the browser.
7) The TCP connection is released.
8) The text and the images in the web pages are displayed in the browser.

Question 7.
You wish to visit the website of your school. Name the software required. Which software is available with Windows for this purpose ? Give names of other such software.
Answer:
Browsing software or Browser. The browsers are:

•  Netscape Navigator
• Internet Explorer
• Mozilla
• Opera
• Mosaic etc.

Question 8.
You want to send a picture drawn using MS paint immediately to your friend. What method will you adopt for this, so that your friend receives it within seconds? Explain the steps to perform this operation.
Answer:
E-mail (Electronic mail) can be used. There is a facility called attachment will help you to send files with E-mail to your friend.
First open your mail box, then take the option to write mail. Fill the email id and subject in the text boxes namely To and Sub respectively. You can type text in the area, given below. Then press the option attachments then select the picture file then press done and press send button.

Question 9.
Suppose you want to collect information regarding ‘Tsunami’ using Internet.
a) Suggest a method for this purpose
b) Explain one method adopted.
Answer:
A browser is a piece of software that acts as an interface between the user and the internal working of the internet. With the help of a browser the user can search information oh the internet and it allows user to navigate through the web pages. The different browsers are

• Microsoft internet explorer
• Mozilla
• Netscape Navigator
• Mosaic.
• Opera

Question 10.
Write short notes on
a) mobile broadband
b) Wi-MAX
Answer:
a) Mobile broadband : Accessing Internet using wireless devices like mobile phones, tablet, USB dongles, etc.
b) Wi MAX (Wireless Microwave Access): It uses micro waves to transmit information across a network in a range 2 GHz to 11 GHz over very long distance.

Question 11.
Compare blogs and microblogs.
Answer:
Blogs: Conducting discussions about particular subjects by entries or posts. The posts appeared in the reverse chronological order means the most recent post appears first.
Eg. Blogger.com, hsslive.com etc.
Microblogs : It allows users to exchange short messages, multi media files etc.
Eg. www.twitter.com

Question 12.
XYZ engineering college has advertised that its campus is Wi-Fi enabled. What is Wi-Fi? How is the Wi-Fi facility implemented in the campus.
Answer:
Wi-Fi means Wireless Fidelity. It is a wireless technology. Some organisation offers Wi-Fi facility. Here we can connect internet wirelessly over short distance, using Wi-Fi enabled devices.
It uses radio waves to. transmit information across a network in a range 2.4 GHz to 5 GHz in short distance. Nowadays this technology is used to access internet in campuses, hyper markets, hotels by using Laptops, Desktops, tablet, mobile phones etc.

Question 13.
Hoyv does a Trojan horse affect a computer?
Answer:
It appears as a useful software but it is a harmful software and it will delete useful softwares or files in a computer.

Question 14.
What are the guidelines one must follow for using computers over the Internet?
Answer:
Guidelines for using computers over internet

• Emails may contain Viruses so do not open any unwanted emails
• Download files from reputed sources(sites)
• Avoid clicking on pop up Advt.
• Most of the Viruses spread due to the use of USB drives so use cautiously.
• Use firewall in your computer
• Use anti virus and update regularly
• Take backups in a regular time intervals

Question 15.
George needs to prepare for a seminar on ‘Backwaters in Kerala’.
a) Name any search engine through which George can get information about the topic.
b) Explain the working behind the search engines to display the information about the seminar topic.
Answer:
a) Google or Yahoo or Bing or Ask etc…
b) Search engines
By using search engines we will get a variety of information. It is a newly developed tool that helped to search the information on the internet more effectively and easily. Search engines are programs that help people to locate information from crores of website on internet using a database that consists of-references. Users can interact with the search engine through the home page of the search engine. To get the information about artificial intelligence just type this in the box provided for it and click the search button.
Search engines searches by using a particular siearch algorithm then displays the matching documents or web addresses. Search engine use soft wares called spiders or bots to search documents and theirweb addresses. Spiders search the internet using the directions given by the search engines and prepare an index and stores it in a database. The searching algorithm searched this database when the users submits a request and create a web page displaying the matching results as hyperlinks.
Eg: Google, Yahoo, Rediff etc.

Question 16.
Mr. Prasanth has bought a new laptop. He wants to take an Internet connection.
a) Explain him various types of broadband connectivity available in the market.
b) Suggest a web browser for him.
Answer:
a) Different types of Broad band connection are given below.
ISDN, Cable Internet (Asianet), DSL, FTTH, Wi- Max, etc.
b) Micro Soft Internet Explorer, Google Chrome, Netscape Navigator, Mozilla Firefox etc.

Question 17.
We want to connect our computer to the Internet for downloading some image. Explain any two connectivity methods?
Answer:
Types of connectivity
There are two ways to connect to the internet. First one dialing to an ISPls computer or with a direct connection to an ISP.

Question 18.
Today social media over the Internet is very popular.
a) In your opinion, what are the best practices to avoid the issues related to its use?
b) Suppose we need a quick response from the public about the ban of smoking in our state. Which type of social media is the best suited for this purpose?
Answer:
a) Following are the best practices to avoid issues related to social media use.
Avoid uploading personal information like Email address, Telephone number, Address, photos,’ videos etc.
Follow a time table for using this websites hence avoid wasting precious time.
If you upload any files in, Wikis, blogs, etc. can be viewed by all members and also can be downloaded. Avoid posting content that you may regret later.
Set your privacy levels such that who can see your posts and who can share them. The 3 privacy levels are private, friends and public.
b) Microblog (Twitter)

Question 19.
List bad effects if any in using social media.
Answer:
Disadvantages

• Intrusion to privacy : Some people may misuse the personal information.
• Addiction : sometimes it may waste time and money.
• Spread rumours : The news will spread very quickly and negatively.

Plus One Computer Application Internet 5 Marks Questions and Answers

Question 1.
Your younger brother does not know the structure of an email message. Explain the structure of an email message.
Answer:
The email message contains the following fields.

1. To : Recipient’s address will be enter here. Multiple recipients are also allowed by using coma.
2. CG : Enter the address of other recipients to get a carbon copy of the message.
3. bcc : The address to whom blind carbon copies are to be sent. This feature allows people to send copies to third recipient without the knowledge of primary and secondary recipients.
4. From : Address of the sender
5. Reply to : The email address to which replies are to be sent.
6. Subject : Short summary of the message.
7. Body : Here the actual message is to be typed.

Question 2.
Email is the most popular, but most misused service of the internet. Justify your answer.
Answer:
The advantages of email are given below:

1. Speed is high
2. It is cheap
3. We can send email to multiple recipients
4. Incoming messages can be saved locally
5. It reduces the usage of paper
6. We can access mail box anytime and from any-where.

The disadvantages are:

1. It requires a computer, a modem, software and internet connection to check mail.
2. Some mails may contain viruses .
3. Mail boxes are filled with junk mail. So very difficult to find the relevant mail.

Students can Download Chapter 8 Computer Networks Questions and Answers, Plus One Computer Application Chapter Wise Questions and Answers helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

Kerala Plus One Computer Application Chapter Wise Questions Chapter 8 Computer Networks

Plus One Computer Application Computer Networks 1 Mark Questions and Answers

Question 1.
An interconnected collection of autonomous computers is called _______.
Answer:
Computer Networks

Question 2.
State true/false
A computer connected to a network is called work station.
Answer:
True

Question 3.
A work station is also called _______.
Answer:
Node

Question 4.
Which hardware is used to connect a work station to a network?
Answer:
Network Interface Card (NIC)

Question 5.
Rules and convention to transmit data on a network is called ______.
Answer:
Protocol.

Question 6.
In your computer lab sometimes you can see that cable from some computers are connected to a small box. What is it ?
Answer:
It is a Hub/Switch

Question 7.
The computers connected in your school lab is a ________ type network.
Answer:
Local Area Network

Question 8.
A Cable TV Network that spread over the city is a _________ type network.
Answer:
Metropolitan Area Network

Question 9.
Internet is a _____ type network.
Answer:
Wide Area Network

Question 10.
The school management is decided to connect computers in your HSS lab and high school lab located adjacent buildings. Which type of network is this?
Answer:
Local Area Network

Question 11.
A company decided to connect the computers of their branch located in another city away from 10 km. Name this network.
Answer:
metropolitan area network.

Question 12.
Geometrical arrangement of computers in a network is called _______.
Answer:
Topology

Question 13.
From the following select an ISP.
a) KSEB
b) KSRTC
c) BSNL
d) PWD
Answer:
c) BSNL

Question 14.
ISP means ______.
Answer:
Internet service provider

Question 15.
ISDN means _______.
Answer:
Integrated services digital network

Question 16.
State true/false.
In peer to peer configuration all the computers are with equal configuration.
Answer:
True

Question 17.
State true/false.
In client server configuration, a computer is powerful than others.
Answer:
True

Question 18.
Consider the following address.
http://www.nic.kerala.gov.in “in” is used to represent what ?
Answer:
“in” is used to represent the country “India”.

Question 19.
Which top level domain is used for non commercial organisation?
Answer:
org

Question 20.
Which geographical top level domain is used for the country “France”?
Answer:
fr

Question 21.
DNS stands for ________.
Answer:
Domain Name System

Question 22.
An IP address consists of ______ bits long.
(a) 4
(b) 16
(c) 32
(d) 64
Answer:
32 bits

Question 23.
An IP address consists of ______ bytes long.
(a) 4
(b) 16
(c) 32
(d) 64
Answer:
4 Bytes

Question 24.
From the following which media is using light rays for data transfer.
(a) Twisted pair cable
(b) Optical fibre
(c) Coanial cable
(d) Micro wave station
Answer:
b) Optical fibre

Question 25.
The wiring is not shared in a topology. Which is that topology.
Answer:
Star

Question 26.
______ is a combination of any two or more network topologies.
Answer:
Hybrid Topology

Question 27.
The nodes in a topology with two or more paths. Which topology is this?
Answer:
Mesh topology

Question 28.
Copying the signals from the earth to satellite is called ________.
Answer:
Uplink

Question 29.
Copying the signals from the satellite to earth is called _______.
Answer:
Downlink , Mesh topology

Question 30.
In very short distance networks, which communication media is used ?
Answer:
Twisted pair cables or coaxial cables.

Question 31.
In long distance networks, which communication medias are used?
Answer:
Optical fibre, microwave station, satellites, etc.

Question 32.
From the following which connector is used to connect UTP/STP twisted pair cable to a computer.
a) RJ-45
b) RS-1
c) CG-1
d) None of these.
Answer:
a) RJ-45

Question 33.
The cable media that use light to transmit data signals to very long distance is _______.
Answer:
Optical fibre cable

Question 34.
AM and FM radio broadcast and mobile phones make use of ______ medium for transmission.
Answer:
Radio waves

Question 35.
A short range communication technology that does not require line of sight between communicating device is ______.
Answer:
Wi-Fi

Question 36.
A communication system that is very expensive, but has a large coverage area when compared to other wireless communication system is ______.
Answer:
Satellite link

Question 37.
In which topology is every node connected to other nodes?
Answer:
Mesh topology

Question 38.
Any device which is directly connected to a network is generally known as ______.
Answer:
Node or Work station or Client or Terminal

Question 39.
In _____ topology all the nodes are connected to a main cable.
Answer:
Bus topology

Question 40
Write the full from of FTTH.
Answer:
Fibre To The Home

Question 41.
Which one of the following statements is TRUE in relation with Wi-MAX Internet connectivity?
a) make use of satellite connection
b) Uses cable connection
c) Uses laser beam for connection
d) Microwave is used for connectivity
Answer:
d) microwave is used for connectivity

Question 42.
Identify the type of LAN topology in which there are more than one path between nodes
a) Star
b) Ring
c) Mesh
d) Bus
Answer:
c) Mesh topology

Question 43.
a) To make data transfer faster, a switch stores two different addresses of all the devices connected to it. Which are they?
b) Name the device that can interconnect two different networks having different protocols.
Answer:
a) IP and MAC address
b) Gateway

Question 44.
a) Different networks with different protocols are connected by a device called….
i) Router
ii) Bridge
iii) Switch
iv) Gateway
b) Define protocol?
Answer:
iv) gateway
b) Protocol : The rules and conventions for transmitting data.

Plus One Computer Application Computer Networks 2 Marks Questions and Answers

Question 1.
Is it possible to connect all the computers to a network? Justify your answer.
Answer:
No. It is not possible to connect all the computers to a network. A computer, with a hardware called Network Interface Card (NIC), can only conect to a network.

Question 2.
Define Computer Networks?
Answer:
Two or more computers connected through a communication media that allows exchange of information between computers is called a Computer Network.
eg:- LAN, MAN, WAN

Question 3.
Do you heard about work station / Node. What is it?
Answer:
A personal computer connected to a network is called work station / Node.

Question 4.
Define a protocol.
Answer:
A protocol is the collection of rules and conventions used to exchange information between computer as a network.

Question 5.
Is the following a valid IP address?
258.1001.10.1.
Justify your answer?.
Answer:
No. It is not a valid IP address. An IP address has 4 parts numeric address. Each parts contains 8 bits. By using 8 bits we can represent a decimal number between 0 to 255. Here 258 and 1001 are greater than 255. So it is not valid.

Question 6.
Mr. Dixon purchased a Laptop with bluetooth technology.
Answer:
It is a specification that allows mobile phones, computers and PDAS to be connected wirelessly over short distance.

Question 7.
Some Airport or college campus offers Wi-Fi facility. What is Wi-Fi?
Answer:
Wi-Fi means Wireless Fidelity. It is a wireless tech-nology. Some organisation offers Wi-Fi facility. Here we can connect internet wirelessly over short distance, using Wi-Fi enabled devices.

Question 8.
What is a protocol ?
Answer:
A protocol is a collection of rules and regulations to transmit data from one computer to another on a network. ”
eg:- http, ftp, TCP/IP, etc.

Question 9.
Explain Infrared waves in detail?
Answer:
These waves are used for transmitting data in short distance and its frequency range is 300 GHz to 400 GHz. Tv’s remote control, wireless mouse and intrusion detectors etc are the devices that used infrared.

Question 10.
Define resource sharing.
Answer:
Resource sharing means the computers on a network can share resources like software
(programs, data ) and hardware (printer,scanner, CD drive etc.).

Question 11.
Name two classification of communication channels between computers in a network.
Answer:
The two classification of communication channels are guided media and unguided media.

Question 12.
What is the use of a Repeater ?
Answer:
A Repeater is a device used to strengthen weak signals on the network and retransmits them to the destination.

Question 13.
Differentiate between router and Bridge.
Answer:
Bridge is a device used to link same type of networks while Router is similar to a bridge, but it can connect two networks with different protocols.

Question 14.
Categorise and classify the different types of network given below.
ATM network, Cable television network, Network within the school, Network at home using Bluetooth, Telephone network, Railway network
Answer:
PAN: Network at home using Bluetooth
LAN: Network within the school
MAN: Cable television network
WAN: ATM network, Telephone network, Railway network

Question 15.
What is PAN?
Answer:
PAN means Personal Area Network. It is used to connect devices situated in a small radius by using guided media(USB cable)or unguided media (Bluetooth, infra red, etc).

Plus One Computer Application Computer Networks 3 Marks Questions and Answers

Question 1.
What are the advantages of Networks?
OR
In a school lab all the 10 computers are connected to a network. We know that there is no need of 10 printers or 10 scanners why? Explain the advantages of Networks?
Answer:
The advantages of Networks are given below.
1) Resource sharing : All the computers in a network can share software (programs, data …..) and hardware (printer, scanner, CD drive etc ).
2) Reliability : If one computer fails, the other computer can perform the work without any delay. This is very important for banking air traffic control and other application.
3) Price Vs Performance : A main frame computer can be 10 times faster than a PC but it costs thousand times 9 PC. Therefore instead of a main frame 10 personal computers are used with less cost and same performance.
4) Communication Medium : It is a powerful communication medium. We can exchange information between computers in a network.
5) Scalable : This means, System performance can be increased by adding computers to a network.

Question 2.
Match the following.

Answer:
1) c
2) a
3) b
4) f
5) d
6) e

Question 3.
Your friend told you that a workstation and server are same. What is your opinion ? Is it true?
Answer:
No it is not true. A work station is a ordinary computer connected to a network. But a server is a powerful computer connected to a network. Its main aim is to serve the needs of workstation. Server is the master and workstations are the slaves.

Question 4.
Your friend told you that there are different types of servers. Do you agree with that ? Justify your answer?
Answer:
Yes, there are different types of servers, dedicated and non dedicated servers.
1) Dedicated Server : In large networks, a computer is reserved only for doing server function like sharing software and hardware resources and it is unavailable for running user applications and therefore increases system cost,
eg:- File server, Printer server etc.
2) Non dedicated Server : In smaller networks, a computer is doing the function of a server as well as it also act as a workstation.

Question 5.
Your friend asked you that a Hub or switch is better. What is your opinion ?
Answer:
A Hub is a device that receives data from a PC and transmit it to all other PC’s on the network. If two or more PC’s transmit data at the same time, there is a chance for collision. Hub is a cheap device and data transfer through a Hub is slow.
A switch is also a device and it transmits data to the right; recipient. There fore collision rate is low. A switch is faster but It is expensive.

Question 6.
ALAN is classified by their configuration. What are they?
Answer:
They are, peer to peer or client-server.
1) Peer to peer: In this configuration all the computers have equal priority. That means each computer can function as both a workstation and a server. There is no dedicated server.
2) Client-Server: In this configuration a computer is powerful which acts as a dedicated server and all others are clients (work stations). Server is the master and others are slaves.

Question 7.
Your friend told you that internet and intranet are same. Do you agree with that. Justify your answer.
Answer:
No. Internet and; intranet are not same. They are different.
Internet: It is a network of networks. It means that international network. We can transfer information between computers within nations very cheaply and speedily.
Intranet: A private network inside a company or organisation is called intranet.

Question 8.
Your friend decides to start an internet cafe in his shop. What are the requirements for this? Help him.
Answer:
1) Computer with a built in Modem or a facility to connect an external modem.
2) A telephone connection
3) An account with an ISP
4) Install respective software
eg:- Internet explorer or mozilla or netscape Navigator etc.

Question 9.
Considerthe following URLand explain each parts.
http://www.nic.kerala.gov.in / results.html.
Answer:
http:- http means hyper text transfer protocol. It is a protocol used to transfer hyper text.
www :- World Wide Web, With an email address
we can open our mail box from anywhere in the world.
nic.kerala :- It is a unique name. It is the official website name of National Informatic Centre
gov:- It is the top level domain. It means that it is a government organisation’s website.
resents the country, in is used for India.
results.html :- It represents the file name

Question 10.
Write any valid email and explain the working of an email.
Answer:
An example of an email id is jobi_cg @ rediffmail. com. Here jobi_cg is the user name, rediffmail is the website address and .com is the top level domain which identifies the types of the organisation. To send an email we require an email address. Some websites provide free email facility. To send an email first type the recipients address and type the message then click the send button.
The website’s server first check the email address is valid, if it is valid it will be sent otherwise the message will not ’ be sent and the sender will get an email that it could not deliver the message. This message will be received by the recipient’s server and will be delivered to recipient’s mail box. He can read it and it will remain in his mail box as long as he will be deleted.

Question 11.
Is it possible to give numeric address (IP address) to URL instead of string address of a website just like the following, http://210.212.239.70/
Answer:
Our Post Office has two addresses one string address (Irinjalakuda) and one numeric code (680121). Just like this the website has also two addresses a string address www.agker.cag.gov.in and a numeric address (htpt://210.212.239.70/).

Numeric Address (IP address) :- It has 4 parts one byte (8 bits) each separated by dots. One byte can represent a number in between 0 to 255. So we can use a number in between 0 to 255 separated by dots. It is a fastest method to access a website. To remember this number is not easy to humans. So a string address is used by humans,
eg:- http://203.127.54.1/.

String Address :- It uses a string to represent a website, it is familiar to the humans. The string ad-dress is mapped back to the numeric address using a Domain Name System (DNS). It may consists of 3 or 4 parts. The first part is www., the second part is website name, the third top level domain and the fourth geographical top level domain,
eg:-www.kerala.gov.in

Question 12.
Arun is in charge of networking the computers in your newly built computer lab.
a) Suggest any two options for communication media that can be used for connecting computers in your school lab.
b) Explain the structure and features of both.
Answer:
a) Twisted pair cables and coaxial cables.
b) Twisted Pair Wire : Two copper wires individually insulated, twisted around each other and covered by a PVC. There are two types of twisted pair wire. They are UTP and STP. It is very cheap and easy to install.
Coaxial Cable: A sturdy copper wire(conductor) is insulated by plastic. This is covered just like a mesh by a conductor , which in turn is enclosed in an protective plastic coating.
Compared to twisted pair wire it is more expensive, less flexible and more difficult to install. But it is more reliable and carry far higher data rates.

Question 13.
The computer uses digital signals and this signal is transmitted through telephone lines to computers at distant locations. Discuss how this is made possible.
Computer digital signals
Answer:
a) Modem
b) A Modem is a two in one device. That is it performs two functions. It is used to convert Digital signals to Analog, the process is Modulation(DAM) and the reverse process is converting Analog to Digital known as Demodulation (ADD).

Question 14.
Explain the structure of the television cable in your house. (3 Scores)
Answer:
Coaxial Cable: A sturdy copper wire(conductor) is insulated by plastic. This is covered just like a mesh by a conductor , which in turn is enclosed in an protective plastic coating.
Compared to twisted pair wire it is more expensive, less flexible and more difficult to install. But it is more reliable and carry far higher data rates. The various coaxial cables are RG-8,RG-9,RG-11,….

Question 15.
Answer the following questions from the list given below.
a) Device used to connect a network using TCP/IP protocol and a network using IPX/SPX protocol
b) Device that can convert a message from one code to another and transfer from one network to a network of another type.
(c) Device used to link two networks of the same type.
Answer:
a) Router
(b) Gateway
(c) Bridge

Question 16.
Find the most suitable match.

Answer:
i) www.keralapsc.org
ii) first page of a web site
ii) file with extension.htm
iv) www.yahoo.com

Question 17.
What do you mean by line of sight method of propagation.
OR
Why Micro wave station use tall towers instead of short one?
Answer:
Micro Wave signals can travel only in straight line. It cannot bend when the obstacles in between. There fore it uses tall towers instead of short one. The dish like antenna mounted on the top of the tower. Hence the two antennas must be in a straight line, able to look at each other without any obstacle in between.

Question 18.
Mr. Alvis took a photograph by using his mobile phone and he sends that photograph to his friend by using blue tooth. What is Blue tooth? Explain,
Answer:
This technology uses radio waves in the frequency * range of 2.402 GHz to 2.480 GHz. And transmit data in short distance. Mobile phones, Laptops, tablets etc use Bluetooth technology to transmit data. By using Bluetooth Dongle(a small device that can be buy from the shop) we can convert non Bluetooth PC into Bluetooth enabled and transmits data with data transmission rate of 3 Mbps onwards.

Question 19.
Differentiate Wi-Fi and Wi-Max in detail.
Answer:
Wi Fi(Wireless Fidelity) uses radio waves to transmit information across a network in a range 2,4 GHz to 5 GHz in short distance. Nowadays this technology is used to access internet in Laptops, Desktops, tablets, Mobile phones etc. But Wi MAX(Wireless Microwave Access) uses micro waves to transmit information across a network in a range 2 GHz to 11 GHz over very long distance

Question 20.
What is MAC address? What is the difference between a MAC address and an IP address?
Answer:
MAC means Media Access Control address. It is a unique 12 digit hexadecimal number(IMEI for mobile phones, it is a 15 digit decimal number) assigned to each NIC by its manufacturer. This address is known as MAC address and it is permanent., it is of the form. MM:MM: MM:SS:SS:SS.The first MM:MM:MM contains the ID number of the adapter company and the second SS:SS:SS represents the serial number assigned to the adapter by the company.
IP address means Internet Protocol address. It has 4 parts numeric address. Each parts contains 8 bits. By using 8 bits we can represent a decimal number between 0 to 255(28=256 numbers). Each part is separated by dot. A total of 4*8=32 bits used. But nowadays 128 bits are used for IP address.

Question 21.
What is the limitation of microwave transmission? How is it eliminated?
Answer:
Micro Wave signals can travel only in straight line. It cannot bend when the obstacles in between. There fore it uses tall towers instead of short one. The dish like antenna mounted on the top of the tower. Hence the two antennas must be in a straight line; able to look at each other without any obstacle in between.

Question 22.
Explain the different types of networks,
Answer:
The networks are classified into the following.
i) Local Area Network (LAN)
This is used to connect computers in a single room, rooms within a building or buildings of one location by using twisted pair wire or coaxial cable. Here the computers can share Hardware and software. Data transfer rate is high and , error rate is less,
eg:- The computers connected in a school lab.
ii) Metropolitan Area Network (MAN)
A Metropolitan Area Network is a network spread over a city. For example a Cable TV network. MAN have lesser speed than LAN and the error rate is less. Here optical fibre cable is used.
iii) Wide Area Network (WAN)
This is used to connect computers over a large geographical area. It is a network of networks. Here the computers are connected using telephone lines or Micro Wave station or Satellites. Internet is an example for this. LAN and MAN are owned by a single organisation but WAN is owned by multiple organisation. The error rate in data transmission is high.

Question 23.
a) To make data transfer faster, a switch stores two
different addresses of all the devices connected to it. What are they?
b) There are 5 computers in your computer lab.
Write short notes on any three possible methods to interconnect these computers. Draw the diagram of each method.
Answer:
a) Identification of computers over a network : A computer gets a data packet on a network, it can identify the sender’s address easily. It is similar to our snails mail, each letter is stamped in sender’s post office as well as receiver’s post office.
1. Media Access Control(MAC) address : It is a unique 12 digit hexadecimal number(IMEI for mobile phones, it is a 15 digit decimal number) assigned to each NIC by its manufacturer. This address is known as MAC address and its permanent.
It is of the form. MM:MM:MM:SS:SS:SS.
The first MM:MM:MM contains the ID number of the adapter company and the second SS:SS:SS represents the serial number assigned to the adapter by the company.

2. Internet Protocol (IP) address : An IP address has 4 parts numeric address. Each parts contains 8 bits. By using 8 bits we can represent a decimal number between 0 to 255(2°=256 numbers). Each part is separated by dot. A total of 4*8=32 bits used. But nowadays 128 bits are used for IP address.

b) Network topologies : Physical or logical arrangement of computers on a network is called structure or topology. It is the geometrical arrangement of computers in a network. The major topologies developed are star, bus, ring, tree and mesh.

1) Star Topology : A star topology has a server all other computers are connected to it. If computer A wants to transmit a message to computer B.
Then computer A first transmit the message to the server then the server retransmits the message to the computer B. That means all the messages are transmitted through the server, advantages are add or remove workstations to a star network is. easy and the failure of a workstation will not effect the other. The disadvantage is that if the server fails the entire network will fail.

2) Bus Topology : Here all the computers are attached to a single cable called bus. Here one computer transmits all other computers listen. Therefore it is called broadcast bus. The transmission from any station will travel in both the direction. The connected computers can hear the message and check whether it is for them or not.
Advantages are add or remove computer is very easy. It requires less cable length and the installation cost is less. Disadvantage is fault detection is very difficult because of no central computer.

3) Ring Topology : Here ail the computers are connected in the shape of a ring and it is a closed loop. Here also there is no central computer. Here a computer transmits a message, which is tagged along with its destination computer’s address. The message travels in one direction and each node check whether the message is for them. If not, it passes to the next node.
It requires only short cable length. If a single node fails, at least a portion of the network will fail. To add a node is very difficult.

4) Hybrid Topology : It is a combination of any two or more network topologies. Tree topology and mesh topology can be considered as hybrid topology.
a) Tree Topology : The structure of a tree topology is the shape of an inverted tree with a central node and branches as nodes. It is a variation of bus topology. The data transmission takes place in the way as in bus topology. The disadvantage is that if one node fails, the entire portion will fail.
b) Mesh Topology : In this topology each node is connected to more than one node. It is just like a mesh (net). There are multiple paths between computers. If one path fails, we can transmit data through another path.

Question 24.
ABC Ltd., required to connect their computers in their company without using wires. Suggest suitable medium to connect the computers. Explain.
Answer:
Unguided Media
1. Radio waves – It transmits data at different frequencies ranging from 3 KHz. to 300 GHz.
2. Microwaves – Microwave signals can travel in straight line if there is any obstacle in its path, it can’t bend. So it uses tall towers instead of short one.
3. Infrared waves – These waves are used for transmitting data in short distance and its frequency range is 300 GHz to 400 GHz.

Question 25.
It is needed to set up a PAN, interconnecting one tablet, two mobile phones and one laptop. Suggest a suitable communication technology and list its features for the following situations:
i) the devices are in a room at distance of 5 to 10 meters.
ii) the devices are in different rooms at a distance of 25 to 50 meters.
Answer:
i) Wireless communication technologies using radio waves
1. Bluetooth : This technology uses radio waves in the frequency range of 2.402 GHz to 2.480 GHz. And transmit data in short distance. Mobile phones, Laptops, tablets etc use Bluetooth technology to transmit data.
ii) Wi Fi(Wireless Fidelity) : It uses radio waves to transmit information across a network in a range 2.4 GHz to 5 GHz in short distance. Nowadays this technology is used to access internet in Laptops, Desktops, tablets, Mobile phones etc.

Question 26.
Computers and other communication devices can be connected a network using wireless technology.
a) A song is transferred from mobile phone to a laptop using this technology. Name the transmission medium used here.
b) Explain any other three communication media which use this technology
Answer:
a) Blue tooth or Radio waves
b) Wireless communication technologies using radio waves

1) Bluetooth : This technology uses radio waves in the frequency range of 2.402 GHz to 2.480 GHz. And transmit data in short distance. Mobile phones, Laptops, tablets etc use Bluetooth technology to transmit data.

2) Wi Fi(Wireless Fidelity) : It uses radio waves to transmit information across a network in a range 2.4 GHz to 5 GHz in short distance. Nowadays this technology is used to access internet in Laptops, Desktops, tablets, Mobile phones etc.

3) Wi MAX(Wireless Microwave Access) : It uses micro waves to transmit information across a network in a range 2 GHz to 11 GHz over very long distance.

4) Satellites : By using satellite we can communicate from any part of the world to any other. The ground stations are connected via the satellite. The data signals transmitted from earth to satellite (uplink) and from the satellite to the earth (downlink).

Question 27.
Find the correct match for each item in column A from columns B and C.

Answer:

Question 28.
Write notes on the following:
a) IP address
b) MAC address
c) Modem
Answer:
a) Internet Protocol (IP) address : An IP address has 4 parts numeric address. Each parts contains 8 bits. By using 8 bits we can represent a decimal number between 0 to 255(28=256 numbers). Each part is separated by dot. A total of 4*8=32 bits used. But nowadays 128 bits are used for IP address.

b) Media Access Control(MAC) address: It is a unique 12 digit hexadecimal number(IMEI for mobile phones, it is a 15 digit decimal number) assigned to each NIC by its manufacturer. This address is known as MAC address.
It is of the form. MM:MM:MM:SS:SS:SS.

c) Modem : It is a device used to connect the computer to the internet. It converts digital signal into analog signal (modulation) and vice versa (De modulation)

Question 29.
Compare any three types of networks based on span of geographical area.
Answer:
Types of networks.
The networks are classified into the following based upon the amount of geographical area that covers.
i) Personal Area Network(PAN) : It is used to connect devices situated in a small radius by using guided media or unguided media
ii) Local Area Network (LAN): This is used to connect computers in a single room, rooms within a building or buildings of one location by using twisted pair wire or coaxial cable. Here the Computers can share Hardware and software. Data transfer rate is high and error rate is less,
eg:- The computers connected in a school lab.
iii) Metropolitan Area Network (MAN): A Metropolitan Area Network is a network spread over a city. For example a Cable TV network. MAN have lesser speed than LAN and the error rate is less. Here optical fiber cable is used.
iv) Wide Area Network (WAN): This is used to connect computers over a large geographical area. It is a network of networks. Here the computers are connected using telephone lines or Micro Wave station or Satellites. Internet is an example for this. LAN and MAN are owned by a single organization but WAN is owned by multiple organization. The error rate in data transmission is high.

Plus One Computer Application Computer Networks 5 Marks Questions and Answers

Question 1.
Explain the different network topologies,
Answer:
Physical or logical arrangement of computers of a network is called structure or topology. It is the geometrical arrangement of computers in a network. The major topologies developed are star, bus, ring, tree and mesh.

1) Star Topology : A star topology has a server all . other computers are connected to it. If computer A wants to transmit a message to computer B. . Then computer A first transmits the message to the server then the server retransmits the message to the computer B. That means all the messages are transmitted through the server. Advantages are add or remove workstations to a star network is easy and the failure of a workstation will not effect the other. The disadvantage is that if the server fails the entire network will fail.

2) Bus Topology : Here all the computers are attached to a single cable called bus. Here one computer transmits all other computers listen. Therefore it is called broadcast bus. The trans-mission from any station will travel in both the direction. The connected computers can hear the message and check whether it is for them or not.
Advantages are add or remove computer is very easy. It requires less cable length and the installation cost is less. Disadvantage is fault detection is very difficult because of no central computer.

3) Ring Topology : Here all the computers are connected in the shape of a ring and it is a closed loop. Here also there is no central computer. Here a computer transmits a message, which is tagged along with its destination computer’s address. The message travels in one direction and each node check whether the message is for them. IF not, it passes to the next node.It require only short cable length. If a single node fails, atleast a portion of the network will fail. To add a node is very difficult.

4) Hybrid Topology : It is a combination of any two or more network topologies. Tree topology and mesh topology can be considered as hybrid topology.
a) Tree Topology: The structure of a tree topology is the shape of an inverted tree with a central node and branches as nodes. It is a variation of bus topology. The data transmission takes place in the way as in bus topology. The disadvantage is that if one node fails, the entire portion will fail.
b) Mesh Topology : In this topology each node is connected to more than one node. It is just like a mesh (net). There are multiple paths between computers. If one path fails, we can transmit data through another path.

Question 2.
What are the different data communication equipments?
Answer:
1) Modem : A Modem is a two in one device. That is it performs two functions. It is used to convert Digital signals to Analog, the process is Modulation (DAM) and the reverse process is converting Ana-log to Digital known as Demodulation (ADD).

2) Multiplexer (Many to One): A multiplexer is a device that combines the inputs from different sources and produces one output. A demultiplexer does the reverse process.

3) Bridge : It is a device used to link two same type of networks.

4) Router : It is a device used to link two networks with different protocols.

5) Gateway : It is a device used to link two networks of different types. lt can convert a message from one code to another.

Question 3.
Explain the protocol TCP/IP
Answer:
TCP – (Transmission Control Protocol) is a connection oriented protocol. It is responsible for sending the data from one PC to another and also verifying the correct delivery of data from client to server. Data can be lost in the intermediate network. TCP adds support to detect errors or lost data and to trigger retransmission until the data is correctly and completely received.

IP – is responsible for moving packet of data from node to node. IP forwards each packet based on a four byte destination address (the IP number). The Internet authorities assign ranges of numbers to different organizations. The organizations assign groups of their numbers to departments. IP operates on gateway machines that move data from department to organization to region and then around the world.
In short TCP handle the flow control and error free packet delivery and IP provides basic addressing and data packets forwarding services.
Eg: 101.65.105.255

Question 4.
What is a protocol. Explain any four.
OR
Why protocol is necessary for communication? Ex-plain any two of them.
Answer:
A protocol is a collection of rules and regulations.to transfer data from one location to another. Transmission Control Protocol (TCP), which uses a set of rules to exchange messages with other Internet points at the information packet level. Internet Protocol (IP), which uses a set of rules to send and receive messages at the Internet address level. .
FTP – File Transfer Protocol which is used for transferring files between computers connected to local network or internet.
HTTP – is a protocol used for WWW for enabling the web browse to access web server and request HTML documents.