Plus One

Kerala Plus One Computer Application Model Question Paper 3

Time: 2 Hours
Cool off time: 15 Minutes
Maximum: 60 Scores

General Instructions to candidates

• There is a ‘cool off time’ of 15 minutes in addition to the writing time of 2 hrs.
• Use the ‘cool off time’ to get familiar with the questions and to plan your answers.
• Read questions carefully before you answering.
• Read the instructions carefully.
• Calculations, figures, and graphs should be shown in the answer sheet itself.
• Malayalam version of the questions is also provided.
• Give equations wherever necessary.
• Electronic devices except non-programmable calculators are not allowed in the Examination Hall.

Part A

Answer all questions from 1 to 5

Question 1.
The Least Significant Digit (LSD) of (1234.56)₁₀ is …………

Question 2.
The process of detecting and correcting errors in a program is called …………….

Question 3.
Name any two keywords in C+ +.

Question 4.
The memory size required for the void data type is ……………

Question 5.
Rewrite the expression a = a + 1 using an arithmetic assignment operator.

Part B

Answer any nine questions from 6 to 16

Question 6.
Find the octal and hexadecimal equivalent of (111101 )₂.

Question 7.
Write a short note on any two utility software.

Question 8.
Redraw the following flowchart by correcting mistakes.

Question 9.
Classify the followings into valid and invalid literals and give a reason for invalid literals.

33,000 +410. 5.6E 82

Question 10.
Consider a = 5 and b = 2 and find the result of the following expressions.

1. a > b
2. a !=b && b > a

Question 11.
Write a short note on any two statements in C+ +

Question 12.
Briefly, explain type promotion with suitable example.

Question 13.
Write the equivalent switch statement for the following.

Question 14.
Define the terms given below.

a. Bandwidth
b. Noise,

Question 15.
Name any four basic elements for data communication.

Question 16.
Write two advantages of Electronic Payment System (EPS).

Part C

Answer any nine questions from 17 to 27

Question 17.
If (X)₁₆ = (Y)₁₀ = (Z)₈ = (11111111)₂. find the values of X, Y and Z.

Question 18.
What is e-waste? Explain any two e-waste disposal methods.

Question 19.
Write an algorithm to find the sum of numbers from 1 to 10.

Question 20.
Explain any two types of programming errors.

Question 21.
Consider the following diagram and answer the question.

Write the base address (Lvalue), content (Rvalue) and Name of variables,

Question 22.
Write short notes on.

a. Preprocessor directive
b. Header file
c. Main() function

Question 23.
What is the use of type modifiers in C++? List any four type modifiers.

Question 24.
Write a C++ program to input an integer and check whether it is positive, negative or zero.

Question 25.
Compare Dialup connection and wired broadband connection.

Question 26.
a. Consider the following email address and write the username and domain name of it.

b. List any four advantages of email.

Question 27.
Explain any three IT-enabled services.

Part D

Answer any two questions from 28 to 30

Question 28.
“Open source software are getting more popular all over the world today”.

a. Write the full form of FSF.

b. Briefly elaborate four freedoms of open source software.

c. Give four examples of open source softwares.

Question 29.
a. List the four different parts of a loop in C++.

b. Compare while loop and do-while loop with suitable example.

Question 30.
a. Define topology,

b. Explain any two topologies.

c. Differentiate HUB and SWITCH.

Answers

Answer 1.
6

Answer 2.
debugging’

Answer 3.
continue, float

Answer 4.
zero. It does not require any memory space.

Answer 5.
a+ = 1

Answer 6.
(111101)₂= 111 → 7, 101 → 5 = (75)₈
(111101)₂ = 0011 → 3, 1101 → D
= (3D)₁₆

Answer 7.
a. Compression tools. Large files can be compressed so that they take less storage area. Compression of files is known as zipping and decompression is called unzipping, eg., WinZip, WinRAR.
b. Disk Defragmenter. It is a program that rearranges files on a computer hard disk. This enables the computer to work faster and more efficiently.

Answer 8.

Answer 9.
33,000: Invalid, Use of special character
(.)
+410. : Invalid. Use of special character
(.)
5.6E: Invalid. No exponent part
82: Valid

Answer 10.

1. True
2. False

Answer 11.
1. Declaration statement. Variables are identifiers of memory locations add are used in programs to refer to data. They should be declared prior to their use in the program and data types are required for this. The syntax of variable declaration is:

data type <variable1>
[, <variable2>, <variable3 >,...];
eg., int rollno, age;

2. Assignment statement. A specific data is stored in memory locations (variables) using an assignment operator (=). The statement that contains = is known as assign.. ment statement. It is also a binary operator and the operand to the left of = should be a variable. The operand after = may be a numeric constant, a variable or an expression of numeric type.

Answer 12.
In implicit type conversion, compiler is responsible for the conversion. It always converts a lower type into, higher one and hence it is also known as type promotion,
eg., For example, the expression 5 / 2 * 3 + 2.5 which gives the result 8.5. The evaluation steps are as follows:
Step 1: 5/2 gives 2 (Integer division) Step 2: 2 * 3 gives 6 (Integer multiplication)
Step 3: 6 + 2.5 gives 8.5 (Boating point addition, 6 is converted into 6.0)

Answer 13.

switch (ch)
{
case ‘P’: cout<<“Pass”;
break;
case ‘F: cout<<“Failed”;
break;
default: cout<<“No result";
}

Answer 14.
a. Bandwidth. It is the maximum amount of data that can be transmitted by the medium. It can be measured in Hertz.
b. Noise. It is the unwanted electrical or electromagnetic interference that adversely affects the transmitted data signals.

Answer 15.
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.
Protocol. The rules and conventions for transmitting data.
Medium. It is the path through which message travels from sender to receiver.

Answer 16.
A system of financial exchange between buyers and sellers in an online environment is called an Electronic Payment System (EPS). The financial exchange is facilitated by a digital financial instrument (such as a credit/debit card, electronic cheque or digital cash) backed by a bank and/or an Intermediary.

Answer 17.
1111 → F, 1111 → F
(11111111)₂ = (FF)₁₆ = (X)₁₆
011 → 3, 111 → 7, 111 → 7
(11111111), = (377)_e = (Z)₈
(11111111 )₂ = 1 × 27 + 1 × 26 + 1 × 2s + 1 × 24 + 1 × 23 + 1 × 22 + 1 × 21 + 1 × 2°
= 128 + 64 + 32+ 16 + 8 + 4 + 2 + 1 = 155
,(155)₁₀ = (Y)₁₀

Answer 18.
It is defined as discarded computers, office electronic equipment, entertainment device, mobile phones, television sets, and refrigerators. This global mountain of waste is expected to continue growing at 8% per year.

1. Reuse: It refers to secondhand use or usage after the equipment has been upgraded or modified.
2. Incineration: It is a controlled and complete combustion process in which the waste is burned in specialty designed incinerators at a high temperature in the range of 900 to 1000 degree Celsius.
3. Recycling: It is the process of making or manufacturing new products from a product that has originally served its purpose.
4. Landfilling: In this method, soil is excavated from the trenches made and waste material is buried in it, which is covered by a thick layer of soil.

Answer 19.

Step 1: Start
Step 2: a = 1, s = 0
Step 3: s = s + a
Step 4: a = a + 1
Step 5: Repeat steps 3 to 4 while a<=10
Step 6: Print M
Step 7: Stop

Answer 20.
1. Syntax errors result when the rules or syntax of the programming language are not followed. Such program errors typically involve incorrect punctuation, incorrect word sequence, undefined term, or illegal use of terms or constructs. In the case of interpreters, the syntax errors will be detected and displayed during execution,

2. The logical error is due to the improper planning of the program’s logic. The language processor successfully translates the source code into machine code if there are no syntax errors. The computer actually follows the program instructions and gives the output as per the instructions. But the output may not be correct. This is known as logical errors. In order to determine whether or not there is a logical error, the program must be tested.

Answer 21.
Base address (Lvalue) 3000
Content (Rvalue) 105
Name of variables NUM

Answer 22.
a. Preprocessor directives. A C++ program starts with preprocessor directives. Preprocessors are the compiler directive
‘ statements which give instruction to the compiler to process the information provided before actual compilation starts. The # include is used to link the header files available in the C++ library. There are some other preprocessor directives such as # define, # undef, etc.

b. Header files. It contains the information about functions, objects and predefined derived data types and they are available along with compiler. The header file ios team contains the information about the objects cin and cout.

c. The main() function. The execution starts at main() and ends within main(). If we use any other function in the program, it is called (or invoked) from main(). The function header main() is followed by its body, which is a set of one or more statements within a pair of braces {}. This structure is known as the definition of the main() function. Each statement is delimited by a semicolon (;).

Answer 23.
C++ provides data type modifiers which help us to alter the size, range or precision. It alters the range of values permitted to a data type by altering the memory size and/or sign of values. Important modifiers are signed, unsigned, long and short.

Answer 24.

# include <iostream> 
using namespace std; 
int main()
{
int a;
cout<<“Enter an integer:”; 
cin >> a;
if (a > 0) .
cout<<“The number is positive”;
else if (a < 0) *
cout<<“The number is negative”;
else
cout<<“The number is zero”; return 0;
}

Answer 25.
Dial-up connection. The internet connection is established by dialing into an ISP’s computer. If ISP is not busy they verify the username and password if it is valid they will connect our computer to the internet. It uses Serial Line Internet Protocol (SLIP) or Points to Point Protocol (PPP). It is slower and has a higher er rotate.

Wired Broadband Connectivity. In these, there is a permanent wire connection, between your computer and ISP. So it’s an “always on” connection. It uses a broadband modem and we can use telephone lines while using the internet.

Answer 26.
a. Username my school
b. Domain name gmail.com b. The advantages of email are:

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 mailbox anytime and from anywhere. „

Answer 27.
1. Medical equipment. Most of the modern medical equipment work with the help of computers. Scanners like CT, MRI depends on computers to process their data. Computer-guided lasers are used in surgery, even in the removal of brain tumors etc.

2. Electronic Medical Records (EMR). It is possible to store all patient’s records in digital format. This is known as EMR. EMR is used by doctors for diagnostics and treatment.

3. Web-based support/diagnosis. There are a lot of treatments, therapies, medical journals are available on the internet, which can be referred to by patients. Some websites provide facility f&r identifying their diseases without consulting a doctor. This prediction may not be correct in some time.

Answer 28.
a. Free Software Foundation
b. Freedom 0: The freedom to run a program for any purpose.
Freedom 1: The freedom to study how the program works and adapt it to your needs. Access to source code should be provided.
Freedom 2: The freedom to distribute copies of the software.
Freedom 3: The freedom to improve the program and release your improvements to the public, so that the whole community benefits.
c.

1. GNU / Linux is a computer operating system assembled under the model of free and open source software development and distribution.
2. GIMP (GNU Image Manipulation’Program) is an image editing software.
3. Mozilla Firefox is one of the most popular web browsers. It provides added security features for safe browsing.
4. OpenOffice.org is a complete office software which contains word processor, spreadsheet and presentations.

Answer 29.
a. A looping statement has four components: initialization expression, test expression, update expression, loop body. The loop body is the set of statements for repeated execution. The execution is continued as long as the test expression (condition) is true. The variable used in the test expression, called a loop control variable, gets its initial value through the initialization expression (or statement). Update expression changes the value of the loop control variable. Usually, it takes place after each execution of the loop body.

b. while loop. The condition is checked first and if it is found, True the body of the loop will be executed. That is the body will be executed as long as the condition is True. The syntax of a while loop is, initialization of loop control variable;

while (test expression)
{
body of the loop;
updation of Ipop control variable;
}
eg., int k= 1; while(k<=3)
{
cout << k << `\t’;
++k;
}

do while loop. The condition is checked only after executing the loop body. So it is certain that the loop body will be executed at least once in the case of do while loop.

Syntax is:
initialization of loop control variable; 
do
body of the loop;
updation of loop control variable;
}
while (test expression); 
eg., int k = 1; do {
cout << k << At’;
++k;
}
while (k<=3);

Answer 30.
a. The physical or logical arrangement of computers on a network is called structure or topology. It is the geometrical arrangement of computers in a network,
b.
1. Ring topology. 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 checks whether the message is for them. If not, it passes to the next node. It requires only short cable length. Its advantages are no signal amplification required because each node do this and requires less cable, so cost-effective. The main disadvantage is if a node fails, the entire network will fail.

2. Bus topology. All the computers are attached to a single cable, called the bus. If anyone node has to send data to another node, it will send the data to the bus. In the bus, the data travels in both directions. The node that needs the data copies it. A small device called terminator connected at both end of the bus removes the data and frees the bus for next transmission. Advantages are added or remove computer is very easy. It requires less cable length and the installation cost is less. A disadvantage is fault detection is very difficult because of no central computer,

c. 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 (device) 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 the speed is high.

Plus One Computer Application Previous Year Question Papers and Answers

Kerala Plus One Computer Application Model Question Paper 2

Time: 2 Hours
Cool off time: 15 Minutes
Maximum: 60 Scores

General Instructions to candidates

• There is a ‘cool off-time’ of 15 minutes in addition to the writing time of 2 hrs.
• Use the ‘cool off time’ to get familiar with the questions and to plan your answers.
• Read questions carefully before you answering.
• Read the instructions carefully.
• Calculations, figures, and graphs should be shown in the answer sheet itself.
• Malayalam version of the questions is also provided.
• Give equations wherever necessary.
• Electronic devices except non-programmable calculators are not allowed in the Examination Hall.

Part A

Answer all questions from 1 to 5

Question 1.
JPEG stands for

Question 2.
The process of making or manufacturing new products from the product that has originally served its purpose is called

Question 3.
Program errors are known as

Question 4.
Its value does not change during execution. What is it?

Question 5.
The act of breaking into a secure network to destroy data is called hacking.

Part B

Answer any nine questions from 6 to 16

Question 6.
If (x)₈ = (101011)₂, then find x.

Question 7.
Explain the benefits of a blue-violet laser in BluRay DVD.

Question 8.
When do we use ROM?

Question 9.
What is the runtime error? Explain.

Question 10.
Identify the errors in the following code segments:

a. 
int main()
{
cout<<“Enter two numbers”
cin >> num >> auto
float area = Length * breadth ;
}
b. 
# include <iostream>
using namespace std
void Main()
{
int a, b 
cin<<a <<b 
max=(a > b) a:b 
cout>max
}

Question 11.
Write the working of arithmetic assignment operator? Explain all arithmetic assignment operators with the help of examples.

Question 12.
Checks whether a given character is an alphabet or a digit.

Question 13.
Define resource sharing.

Question 14.
Define network topology.

Question 15.
What are the disadvantages of email?

Question 16.
What are the facilities provided by the IRCTC website?

Part C

Answer any nine questions from 17 to 27

Question 17.
What are the methods of representing integers in computer memory?

Question 18.
What is the role of a computer in problem-solving?

Question 19.
What is a computer program? How do algorithms help to write programs?

Question 20.
Distinguish between identifiers and keywords.

Question 21.
Explain the different types of logical operators in C++.

Question 22.
Explain the memory representation of a variable with the help of an example.

Question 23.
How do the type modifiers affect the size and range of int and char data types?

Question 24.
Write a C++ program to find the biggest number from 3 given numbers.

Question 25.
Briefly explain the working of a for loop along with its syntax. Give an example of for loop to support your answer.

Question 26.
What are the advantages and disadvantages of social media?

Question 27.
Discuss in detail various uses of IT in health care field.

Part D

Answer any two questions from 28 to 30

Question 28.
List and explain various categories of software.

Question 29.
In the following program, some lines are missing. Fill the missing lines and complete it.

# include<iostream.h>
....................................
{ 
int num1, num2, sum; 
cout<< “Enter two numbers:”;
......................................
......................................
cout<< “Sum of numbers are = "<<sum;
}

Question 30.
Which is/are communication channels suitable for the following situations?

a. Setting up a LAN.

b. Transfer of data from a laptop to a mobile phone.

c. Transfer of data from one mobile phone to another.

d. Creating a remote control that can control multiple devices in a home.

e. Very fast communication between two offices in two different countries.

f. Communication in hilly area.

g. Communication within a city and its vicinity where a coast of cabling is too high.

Answers

Answer 1.
Joint Picture Experts Group

Answer 2.
recycling

Answer 3.
bugs

Answer 4.
constant

Answer 5.
unethical

Answer 6.
101 → 5,
011 → 3
x = 53

Answer 7.
The benefit of using a blue-violet laser is that it has a shorter wavelength which makes it possible to focus the laser spot with greater precision. This allows data to be packed more tightly. Therefore it is possible to store more data on the disk. Can hold up to 25 GB on a single-layer disc and 50 GB on a dual-layer disc. ‘

Answer 8.
ROM is nonvolatile; the contents are retained even after the power is switched off. It is used to hold boot up a program known as Basic Input Output System (BIOS). This software runs when the computer is switched on or ‘boots up’. It checks the computer’s hardware and then loads the operating system.

Answer 9.
The error messages may be displayed by the error handling function of the language. These errors are known as a runtime error. These errors can be rectified by providing instruction for checking, the validity of the data before it gets processed by the subsequent instructions in the program.

Answer 10.
a. No header file, no semicolon is used at the end of a second and third statement. Variables did not declare a return value not specified, auto cannot be used here.
b. M is upper case in main(), no semicolon used in any statements. Operators of sin and cout are wrong. Missing in conditional operator?

Answer 11.
A simple arithmetic statement can be expressed in a more condensed form using arithmetic assignment operators.
eg., a=a+10 can be represented as a+=10. Here += is arithmetic assign* meant operator. The arithmetic assignment operators in C++ are +=, =,*=,/=, %=. These are also known as C++ shorthands. These are all binary operators and the first operand should be a variable. The use of these operators makes the two operations (arithmetic and assignment) faster than the usual method.

Answer 12.

# include<iostream> 
using namespace std; 
int main()
{
char ch;
cout << “Enter the character(only small letter): "; 
cin » ch;
if (ch >= ‘a’ && ch <= 'z) 
cout<<“You entered an alphabet”; 
if (ch >= ‘0’ && ch <= ‘9’) 
cout<<“You entered a digit\n”; 
return 0;
}

Answer 13.
It is defined as the sharing of available hardware and software resources in a computer network.

Answer 14.
The physical or logical arrangement of computers on a network is called structure or topology. It is the geometrical arrangement of computers in a network.

Answer 15.
1. It requires a computer, a modem, software, and internet connection to check mail.
2. Some emails may contain viruses.
3. Mailboxes are filled with junk mail. So very difficult to find the relevant mail.

Answer 16.
IRCTC provides online booking facilities of railway tickets and offers other services like checking reservation status, train timing, reservation of hotels for the tourists across the country.

Answer 17.
There are three methods for representing an integer number in computer memory. They are:
a. Sign and magnitude representation
b. 1’s complement representation
c. 2’s complement representation

Answer 18.
A computer can solve problems only when we give instructions to it. If it understands the tasks contained in the instructions, it will work accordingly. An instruction is an action-oriented statement. It tells the computer what operation it should perform. A computer can execute (carry out the task contained in) an instruction only if the task is specified precisely and accurately.

Answer 19.
A sequence of instructions written in a language that is understood by a computer is called a computer program.
The algorithm is a step by step procedure to solve a problem. Each step represents a specific task. These steps help the programmer to write instructions in a programming language.

Answer 20.
Identifiers are the user-defined words that are used to name different program elements such as memory locations, statements, functions, objects, classes etc.

The words (tokens) that convey a specific meaning to the language compiler are called keywords. These are also known as reserved words as they are reserved by the language for special purposes and cannot be redefined for any other purposes.

Answer 21.
1. && (logical AND). If two relational expressions E1 and E2 are combined using this ‘operator, the result will be 1 (True) only if both E1 and E2 have values 1 (True). In all other cases, the result will be 0 (False).
2. 11 (logical OR). If two relational expressions E2 and E2 are combined using logical OR (| |) operator, the result will be 0 (False) only if both E1 and E2 are having a value 0 (False), In all other cases, the result will be 1 (True).
3. (logical NOT). This operator is used to negate the result of a relational express

Answer 22.

Memory representation of a variable The variable name is num and it consumes 4 bytes of memory at memory addresses 101, 102, 103 and 104. The content of this variable is 18. That is the Lvalue of num is 101 and the Rvalue is 18.

Answer 23.
C++ provides data type modifiers which help us to alter the size, range or precision. It alters the range of values permitted to a data type by altering the memory size and/or sign of values.

Answer 24.

# include<iostream> 
using namespace std; 
int main()
{
int colour;
cout<<“Enter a number between 1 and 4:”;
cin>>colour; 
if (colour==1) 
cout<<“Red”; 
else if (colour==2)
cout<<“Green”; 
else if (colour—3) 
cout<<“Blue”; else
cout<<“Wrong input”; 
return 0;
}

Answer 25.
for loop is an entry controlled loop. All the three loop elements (initialization, test expression, and update statement) are placed together in for a statement. So it Snakes the program compact. The syntax is:

for (initialization; test expression; update statement)
body-of-the-loop;
}
These three steps (test, body, update) are continued until the test expression

is evaluated to False, 
eg., for (n=1; n<= 10; ++n)
{
cout<< “hello”;
}

Answer 26.
Advantages are:

1. Bring people together; It allows people to maintain the friendship.
2. Ran and organize events: It allows users to plan and organize events.
3. Business promotion: It helps the firms to promote their sales.
4. Social skills: There is a key role in the formation of society.

Disadvantages are:

1. Intrusiontoprivacy. The personal information (photo, email id, phone number, name, address etc.) posted in such sites can be used for illegal activities.
2. Addiction. Addiction to such sites wastes our valuable time.
3. Spread rumors. Social media will spread the news quickly.

Answer 27.
Some of the areas where ICT used in health are the following:
1. Medical equipment. Most of the modern medical equipment work with the help of computers. Scanners like CT, MRI depends on computers to process their data. Computer-guided lasers are used in surgery, even in the removal of brain tumors etc.

2. Electronic Medical Records (EMR). It is possible to store all patient’s records in digital format. This is known as EMR. EMR is used by doctors for diagnostics and treatment.

3. Web-based support/diagnosis. There are a lot of treatments, therapies, medical journals are available on the internet, which can be referred to by patients. Some websites provide a facility for identifying their diseases without consulting a doctor. This predictions, may not be correct in some time.

4. Telemedicine. It helps to monitor and share a patients conditions like body temperature, blood pressure, heartbeats, ECG etc. from a distant place by a doctor. A surgeon in one place of the world can contact an expert from another part of the world while performing a surgery. It reduces cost and time.

5. Research and Development. Various researches are going on to discover new medicines. Use of IT in biotechnology have reduced the cost of drug discovery. Drugs for a specific purpose can be developed with the use of advanced computers.

Answer 28.
The software is a general term used to denote a set of programs that help us to use a computer system and other electronic devices efficiently and effectively. The two types of software are:
1. System software: It is a set of one or more programs designed to control the operations of a computer.

• Operating system: It is a set of programs that act as an interface between the user and computer hardware.
• Language processors: The instructions to the computer are written in different languages. Various language processors are:
  • Assembler: It converts languages written in assembly language into machine language.
  • Interpreter: It converts a high-level language into machine language by-line by line.
  • Compiler: It translates a high-level language into machine language by converting all the lines at a time.
• Utility software: A set of programs which help users in system maintenance tasks and in performing tasks of routine nature. Utility programs are compression tools (WinZip, Win RAR), disk defragmenter (rearranges files on a computer hard disk), backup software.

2. Application software: It is the software developed for a specific application. It includes general purpose software (Word Processing software, spreadsheet software, presentation software, database, multimedia), specific purpose software (designed to handle particular tasks).

Answer 29.

# include<iostream.h> 
void main()
{
int num1, num2, sum;
cout<< “Enter two numbers:”;
cin»num1>>num2;
sum = num1 + num2;
cout<< “Sum of numbers are = ”
<<sum;
}

Answer 30.
a. STP/UTP (Twisted pair cable)
b. Bluetooth or WiFi
c. Bluetooth or infrared
d. Infrared
e. Satellite communication
f. Microwaves
g. WiMax

Plus One Computer Application Previous Year Question Papers and Answers

Kerala Plus One Computer Application Model Question Paper 1

Time: 2 Hours
Cool off time: 15 Minutes
Maximum: 60 Scores

General Instructions to candidates

• There is a ‘cool off-time’ of 15 minutes in addition to the writing time of 2 hrs.
• Use the ‘cool off time’ to get familiar with the questions and to plan your answers.
• Read questions carefully before you answering.
• Read the instructions carefully.
• Calculations, figures, and graphs should be shown in the answer sheet itself.
• Malayalam version of the questions is also provided.
• Give equations wherever necessary.
• Electronic devices except non-programmable calculators are not allowed in the Examination Hall.

Part A

Answer all questions from 1 to 5

Question 1.
Information may act as data. State True or False.

Question 2.
…………….. register holds the address of the next instruction to be executed by the processor.

Question 3.
A program written in HLL is known as ………..

Question 4.
The unpredictable value assigned to a variable at the time of its declaration is known as

Question 5.
The small text files used by browsers to remember our email IDs, usernames etc. are known as ……………..

Part B

Answer any nine questions from 6 to 16

Question 6.
Find decimal equivalent of (10001)₂

Question 7.
What are the advantages of a hard disk?

Question 8.
Differentiate hardcopy and softcopy.

Question 9.
Write the names of two phases that are included in debugging.

Question 10.
What would happen if main () is not present in a program?

Question 11.
Comments are useful to enhance readability and understandability of a program. Justify this statement with examples.

Question 12.
What are the are the requirements to implement a multi-branching using a switch statement?

Question 13.
What is the peer-to-peer network? Peertopeer

Question 14.
Switch and hub are two devices associated with networking. Differentiate them.

Question 15.
Compare intranet and extranet.

Question 16.
What are the advantages of EMR?

Part C

Answer any nine questions from 17 to 27

Question 17.
And the smallest number in the list.

a. (1101 )₂
b. (A)₁₆
c. (13)₈
d. (15)₁₀

Question 18.
Write an algorithm to find a sum of first 100 odd numbers.

Question 19.
Draw a flowchart to display the first 100 natural numbers.

Question 20.
What is a floating point constant? What are the different ways to represent a floating point constant?

Question 21.
What are the three aspects of variables?

Question 22.
Find out the errors, if any, in the following C++ statements:

1. cout<< “a=” a;
2. m=5, n=12; 015
3. cout << “x” ; <<x;
4. cin >> y
5. cout>>\n “abc”
6. a = b + c
7. break = x

Question 23.
The following program finds the sum of three numbers. Modify the program to find the average. (Average should display fractional part also).

# include<iostream>
using namespace std;
int main ()
int x, y, z, result;
cout<<“Enter values for x, y, z”;
cin>>x>>y>>z;
result = x + y + z; .
cout<< “The answer is =”<<result; 
return 0;
}

Question 24.
Rewrite the following statement using while and do while loops.

for(i=1; i<=10; i++) cout<<i;

Question 25.
Write the significance of break statement in the switch statement. What is the effect of the absence of a break in a switch statement?

Question 26.
What are the methods for preventing network attacks?

Question 27.
What are the major challenges faced in the implementation of e-Learning?

Part D

Answer any two questions from 28 to 30

Question 28.
Explain any five commonly used secondary or (auxiliary) memory devices.

Question 29.
WHte a C++ program to find the total and percentage of a student in six subjects.

Question 30.
What is network protocol? Explain.

Answers

Answer 1.
True

Answer 2.
Program Counter (PC)

Answer 3.
source code

Answer 4.
garbage value

Answer 5.
cookies

Answer 6.
(10001)₂ = 1 × 2⁴ + 0 × 2³ + 0 × 2² + 0 × 2¹ + 1 × 2°
= 16 + 0 + 0 + 0 + 1
= 17
(10001 )₂ = (17)₁₀

Answer 7.
Hard disks have very high storage capacity, high data transfer rates, and low access time, it is more durable and less error-prone.

Answer 8.
Hardcopy outputs are permanent outputs which can be used at a later date or when required.
Softcopy outputs are electronic and are available on the screen in a digital form.

Answer 9.
Two phases that included in debugging are debugging of syntax errors during translation and debugging of logical errors during execution.

Answer 10.
The execution starts at main() and ends within main(). If we use any other function in the program, it is called (or invoked) from main().

Answer 11.
Comments are lines in the code that are added to describe the program. They are ignored by the compiler.
i. Single line comment: The characters // (two slashes) is used. The text appearing after II in a line is treated as a comment by the C++ compiler.
ii. Multiline comments: Anything written within /* and */ is treated as a comment so that the comment can take any number of lines.
eg., /* This program displays the message “Smoking is injurious to health” on the monitor */

# include <iostream.h> // To use the cout object
using namespace std; // To access cout 
int main() // program begins here 
{ // The following output statement displays a message
cout << “Smoking is injurious to health"; return 0;
} // end of the program

Answer 12.
The following are the requirements to implement a multi-branching using a switch statement:

1. Conditions involve only equality checking. In other cases, it should be converted into equality expression.
2. The first operand in all the equality expressions should be the same variable or expression.
3. The second operand in these expressions should be integer or character constants.

Answer 13.
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.

Answer 14.
A switch is an expensive device used to connect computers (device) 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 the speed is high.

Answer 15.
Intranet: A private network inside a company or organization is called intranet.
Extranet: It allows vendors and business partners to access the company resources.

Answer 16.
It is a more economical way of storing data. Medical history of patients will be accessible to patients easier and quicker. Transfer of records’ of patients between doctors/hospitals is much easier. A medical condition of a patient can be examined.

Answer 17.
a: (1101)₂ = 1 × 2³ + 1 × 2² + 0 × 2¹ + 1 × 2°
= 8 + 4 + 1
= 13
b. (A)₁₆ = 10
c. (13)₈ = 1 × 81 + 3 × 8°
= 8 + 3 = 11
d. (15)₁₀ = 15
The smallest value is (A)₁₆ = 10

Answer 18.

Step 1: Start
Step 2: Sum = 0, count = 1
Step 3: If count/2==1 then go to Step 4
Step 4: Sum = Sum + count
Step 5: count = count + 1
Step 6: If count<=100 then go to Step 3
Step 7: Print Sum
Step 8: Stop

Answer 19.

Answer 20.
Rotating point literals or real constants are numbers having fractional parts. These can be written in one of the two forms called fractional form or exponential form. A fractional form consists of signed or unsigned digits including a decimal point between digits. A real constant in exponent form has two parts: a mantissa and an exponent.

Answer 21.

1. Variable name. It is a symbolic name (identifier) given to the memory location through which the content of the location is referred to.
2. Memory address. Every cell (or byte) in RAM will be assigned a unique address to refer it. The address is also called the Lvalue of a variable.
3. Content. It is the value stored in the location. This is also called the Rvalue of the variable. Type and size of the content depending on the data type of the variable.

Answer 22.

1. After “a=” an operator << is missing.
2. The data type is missing, the variable name of 015 is missing.
3. The first semicolon is an error.
4. The semicolon is missing at the end.
5. The semicolon is missing at the end. << should be used after cout. \n must be in double quote.
6. The semicolon is missing at the end. A data type is missing.
7. The semicolon is missing at the end. a break is a keyword.

Answer 23.

# include<iostream> 
using namespace std;
int main ( )
int x, y, z; float result;
cout<< “Enter values for x, y, z”; 
cin>>x>>y>>z; 
result = (x + y + z)/3.0; 
cout<< “The answer is =”<<result; 
return 0;
}

Answer 24.

while: 
i = 1;
while (i<= 10)
{
cout<<i;
i++;
}
do while: 
i = 1; 
do 
{
cout<<i;
i++;
}
while (i<= 10);

Answer 25.
When a break statement is encountered, the program control goes to the statements following the switch statement.
If the break statement is absent, even after finding a match other cases following are also checked. If no match is found, statements in the default block get executed.

Answer 26.
1. Firewall. A firewall is a combination of computer hardware and software that provide security to the computer/network. A firewall checks all the incoming and outgoing data from your computer and determines whether they are allowed or not.

2. Antivirus scanner. Antivirus software scans the files in the computer and removes viruses if they found. When an antivirus found malware in a file, the antivirus stops the file from running and put it into quarantine. Quarantine is a special area for storing files that are infected by a virus.

3. Cookies. These are small text files created when we use a browser to visit a website. Cookies store information like usernames, email address, websites visited, products purchased etc. Cookies help for efficient browsing. Cookies are not viruses, but it is possible for a hacker to use cookies as spyware. Most browsers provide facility to delete cookies.

Answer 27.

1. Face to face contact between students adds teachers is not possible.
2. Proper interaction among teachers and students are often limited due to the lack of infrastructural facilities.
3. Equipment and technology (computer and high speed Internet) requirement restrict the adoption of e-Learning.
4. Learners who require constant motivation may not be serviced adequately.
5. Handson on real laboratory scenario is also a constraint in eLearning.

Answer 28.
1. Hard disk. It consists of metal disks coated with magnetic material concealed in dust free containers. Hard disks have very high storage capacity, high data transfer rates and low access time. It is more durable and less error prone. A hard disk may contain one or more platters. Each platter requires two read/write heads, one for each surface.

2. Compact Disc (CD). It is an optical storage medium capable of storing upto 700 MB of data. A CD drive uses red laser beams for reading from and writing data into CD. Two types of CDs are CDR (recordable) and CDRW (Rewritable).

3. USB flash drive. It is a small external storage device which consists of flash memory. These are portable and rewritable. The storage capacity of a USB drive currently varies from 2 GB to 32 GB.

4. Digital Versatile Disk (DVD). In these higher storage capacity is achieved by using smaller spots to record data. Recording and reading of data is done using DVD drive. The capacity of a DVD varies from 4.37 GB to 15.9 GB. There are three major types of DVDs: DVDROM, DVDRW and DVDRAM.

5. Magnetic tape. It is a backup device that can store huge volume of data. The cost per unit volume of a magnetic tape is less compared to other magnetic storage devices. It is a recording medium consisting of a thin tape with a coating of fine magnetic material. It can be used for recording analog or digital data. Data is stored in frames across the width of the
‘tape with a read/ write head.

Answer 29.

# include <iostream> 
using namespace std; 
int main()
{
int i, mark, sum = 0, max; 
float per;
for (i = 0; i<6; i++)
{
cout<<“ Enter the mark: ”;
cin>>mark;
sum = sum + mark; 
}
cout<<“Enter the maximum mark: ”; 
cin>>max;
per = (sum/max)* 100; 
cout<<“Sum of the entered marks:” << sum;
cout<<“ Percentage of the marks in six subjects:” << per; 
return 0;
}

Answer 30.
A protocol is a collection of rules and regulations to transfer data from one location to another. Different types of protocols are:

1. Transmission Control Protocol (TCP): It uses a set of rules to exchange messages with other internet points at the information packet level.
2. Internet Protocol (IP): It uses a set of rules to send and receive messages at the internet address level.
3. File Transfer Protocol (FTP): It is used for transferring files between computers connected to local network or internet.
4. Hyper Text Transfer Protocol (HTTP): It is a protocol used for WWW for enabling the web browse to access web server and request HTML documents.

Plus One Computer Application Previous Year Question Papers and Answers

Kerala Plus One Computer Application Previous Year Question Paper 2017

Time: 2 Hours
Cool off time: 15 Minutes
Maximum: 60 Scores

General Instructions to candidates

• There is a ‘cool off-time’ of 15 minutes in addition to the writing time of 2 hrs.
• Use the ‘cool off time’ to get familiar with the questions and to plan your answers.
• Read questions carefully before you answering.
• Read the instructions carefully.
• Calculations, figures, and graphs should be shown in the answer sheet itself.
• Malayalam version of the questions is also provided.
• Give equations wherever necessary.
• Electronic devices except non-programmable calculators are not allowed in the Examination Hall.

Question 1.
Processed data is known as ………….
a. facts
b. figures
c. information
d. raw material

Question 2.
USB port stands for ……………..

a. Uniform Serial Bus
b. Universal Serial Bus
c. Uninterruptable Serial Bus
d. Updatable Serial Bus

Question 3.
Fill the missing block.

Question 4.
Which one of the following is NOT a search engine?

a. Google
b. Bing
c. Facebook
d. Ask

Question 5.
In ICT enabled services BPO stands for

Question 6.
for, while do while are the three looping statements in C+ +. From these three loops which loop will execute the loop body at least once even though the condition is false?


a. for loop
b. while loop
c. do while loop
d. do for loops

Question 7.
HTTP stands for a ………………. protocol.

Question 8.
IDE stands for …………..

a. Integrated Development Environment
b. Information Development Environment
c. Inheritance Development Environment
d. Interactive Development Environment

Question 9.
Let X and Y are two variables of int data type, then correct the following input statement.

Question 10.
In a flowchart, the terminal (an ellipse) symbol is used to indicate the ……………… and …………… in the program logic.

Question 11.
A ……………….. is a computer peripheral that allows you to connect and communicate with other computers via telephone lines.

Question 12.
Differentiate or define the terms Hardware (h/w) and software (s/w) in a computer system. Give one example for each.

Question 13.
a. Convert (1010.11)₂ to decimal.
b. Find the missing terms in the following series. (18)₁₆, (1A)₁₆, (1C)₁₆ ………………., ……………….

Question 14.
Predict the output of the following operations. x = – 5 and y = 3 initially,

Consider the following statement.

int Length;
Then what is the difference between (a) and (b)?

a. Length = 50
b. Length ==50

Question 15.
Arrange the following memory or storage devices on the base of their operation speed in ascending order.

a. Hard disk
b. Cache
c. RAM
d. Registers

Question 16.
List the different stages in programming.

Question 17.
Classify the following identifiers valid or invalid. If invalid, give a reason.

a. Length_l
b. _Lengthl
c. Length 1
d. 1 Length

Question 18.
A part of biodata of a student is given. Identify the data types which we can use to store and process these data.

RolIJMumber : 34
Age : 17
Sex : M
Mob_Number : 8181818181
Height_in_Cm : 152.8
Rncode : 690601

Question 19.
State whether the following statements are true or false. If false, give a reason.

a. break statement is essential in a switch.
b. for loop is an entry controlled loop.
c. do while loop is an entry controlled loop.
d. the switch is a selection statement.

Question 20.
URL stands for Uniform Resource Locator. Every resource on the internet has a unique URL. Then classify the following URL on the basis of

http://www.dhsekerala.gov.in/index.html
a. Network protocol
b. Domain name
c. Filename

Question 21.
How is a WAN different from a LAN?

Question 22.
If a = 5, b = 4, c = 3, d = 4, then what is the result in X after the following operation ?

Is there any difference between (a) and (b) by considering the following statement?

a. Gender = ‘M’;
b. Gender = ‘M’;

Question 23.
Your friend Ravi purchased a new PC for his personal use. Mention the components required to connect this PC to the internet.

Question 24.
Compare the advantages and disadvantages of implementing eBusiness.

Question 25.
Compare Dot Matrix Printer (DMP), inkjet printer, laser printer, and thermal printer on the basis of their working speed, quality of printing and expense for printing.

Dot Matrix Printer (DMP), inkjet printer, laser printer, thermal printer.

Question 26.
Rewrite the following code using else if ladder.

# include<iostream> 
using namespace std; 
int main()
{
int colour;
cout«“Enter a number between 1 and 4 : ";
cin»colour;
switch(colour)
{
case 1:
cout<<“Red”; 
break; case 2:
cout<<“ Green"; 
break; case 3:
cout<<“Blue”;
break;
default:
cout<<“Wrong input”;
}
}

OR

Write a C++ program to find the biggest number from 3 given numbers.

Answers

Answer 1.
c. Information

Answer 2.
b. Universal Serial Bus

Answer 3.
Compiler / interpreter / assembler /language processors

Answer 4.
c. Facebook

Answer 5.
Business Process Outsourcing

Answer 6.
c. do while loop

Answer 7.
Hyper Text Transfer Protocol

Answer 8.
a. Integrated Development Environment

Answer 9.

cin>>X>>Y;

Answer 10.
Start and Stop

Answer 11.
MODEM

Answer 12.
Hardware is the tangible and visible parts of a computer, which consists of some electromechanical components, eg., keyboard, mouse. The software is a set of programs that help us to use the computer system for our needs, eg., Operating system, language processors.

Answer 13.
a. (1010.11)₂ = 1 × 2³ + 0 × 2² + 1 × 2¹
+ 0 × 2°+ 1 x 2¹ + 1 × 2²
= 8 + 0 + 2 + 0 + 1/2 + 1/4
= 10 + 0.75
= 10.75
b (1E)₁₆, (20)₁₆

Answer 14.
a. 5
b.1
c.2
d. 2

OR

a. The value 50 will be stored in the variable Length (ie., assignment operation).
b. The value 50 and the value of Length will be compared.

Answer 15.
Hard disk, RAM, Cache, Registers

Answer 16.

1. Problem identification: During this phase, you will be able to identify the data involved in processing, its type and quality, a formula to be used, activities involved and the output to be obtained.
2. Preparing algorithms and flowcharts: Once the problem is identified, it is necessary to develop a precise step-by-step procedure to solve the problem.
3. Coding the program: The process of writing program instructions to solve a problem is called coding. The program written in any HLL is known as source code.
4. Translation: It is the process of converting a program written in the high-level language into its equivalent version in machine language. The compiler or interpreter is used for this purpose.
5. Debugging: In this stage, programming errors are discovered and corrected. Programming errors are known as ‘bugs’ and the process of detecting and correcting these errors is called debugging.

Answer 17.
a. Valid
b. Valid
c. Invalid; White space is used.
d. Invalid; the First letter is a digit.

Answer 18.
Roll_Number: int
Age: int
Sex: char
Mob_Number: long int
Height_in_Cm: float
Pincode: int/long int

Answer 19.
a. True
b. True
c. False; do while loop is an exit controlled loop
d. True

Answer 20.
a. http
b. dhsekerala.gov.in
c. index.html

Answer 21.
Wide Area Network (WAN). This is used to connect computers over a large geographical area. It is a network\of network. Here the computers are connected using telephone lines or microwave station or satellites. The error rate in data transmission is high, eg., internet. Local Area Network (LAN). This is used to connect computers in a single room or buildings of one location by using twisted pair wire or coaxial cable. Data transfer rate is high and an error rate is less.

Answer 22.
-3
OR
a. It is true. The variable is a type of char and the value assigned is a character value.
b. This statement is wrong. The variable is a type of char and the value assigned is a string.

Answer 23.
The following are the requirements for connecting a computer to the Internet:
1. (NIC) and an operating system that supports TCP/IP.
2. Modem
3. Telephone connection
4. Internet account of any ISP (Internet Service Provider)
5. Software for browsing.

Answer 24.
The major advantages of using e-Business applications are:

• With e-Business, you can buy and sell products from anywhere.
• eBusiness reduces the operational cost.
• It minimizes travel time and cost. Challenges to eBusiness:
• Most of the people are unaware of online business and its possibilities or they do not know how to conduct this.
• Most of the people from rural areas do not have plastic money (debit card, credit card) which is necessary for eBusiness.
  If not used with caution your valuable information like credit card no., password etc. may lose.

Answer 25.

1. Dot matrix printers use small electromagnetically activated pins in the print head and an inked, to produce images by an impact. These printers are slow and noisy.
2. Inkjet printers form the image on the page by spraying tiny droplets of ink from the printed head. The printer needs several colors of ink. These are inexpensive, but the cost of ink cartridge makes it a costly.
3. Laser printer produces good quality output. The image to be printed is transferred to a drum using a laser beam. The toner powder from the toner cartridge is then sprayed on the drum. The toner powder sticks onto the portions traced the drum by the laser beam. It is transferred to a paper by rolling the paper on the drum. Through heating, the powder is fused on to the paper. Laser printers are faster and their speed is in page per minute (ppm).
4. The thermal printer produces a printed image by selectively heating heat-sensitive when it passes over the thermal print head.

Answer 26.

# include<iostream>
using namespace std;

int main()
{
int colour;
cout<<“Enter a number between 1 and 4:";
cin»colour; if (colour==1)
cout<<“Red”;
else if (colour==2)
cout<<“Green”; 
else if (colour==3) cout«“Blue";
else
cout«“Wronginput”; 
return o;
}

OR

#include<iostream> using namespace std; 
int main() 
{
int a, b, c;
cout<<“Enter three different numbers:”; 
cin >> a >> b >> c ; 
if (a > b)
{
if (a > c)
cout<<“The largest number is:”« a; 
else
cout<<“The largest number is:”<<c;
}
else
{
if (b > c)
cout<<“The largest number is:”«b; 
else
cout<<“The largest number is: ”<<c;
}
return O;
}

Plus One Computer Application Previous Year Question Papers and Answers

Kerala Plus One Computer Application Previous Year Question Paper 2018

Time: 2 Hours
Cool off time: 15 Minutes
Maximum: 60 Scores

General Instructions to candidates

• There is a ‘cool off time’ of 15 minutes in addition to the writing time of 2 hrs.
• Use the ‘cool off time’ to get familiar with the questions and to plan your answers.
• Read questions carefully before you answering.
• Read the instructions carefully.
• Calculations, figures, and graphs should be shown in the answer sheet itself.
• Malayalam version of the questions is also provided.
• Give equations wherever necessary.
• Electronic devices except non-programmable calculators are not allowed in the Examination Hall.

Part A
Answer all questions from 1 to 5

Question 1.
The meaningful and processed form of data is known as ……………….

Question 2.
Write the full form of USB.

Question 3.
…………….. is a step by step procedure to solve a problem.

Question 4.
What is the name of files created to support C++ programs and kept in the standard library?

Question 5.
Find out the odd one from the following:

a. DOS
c. ISDN
b. DSL
d. FTTH

Answer any nine questions from 6 to 16

Question 6.
Despite the high speed and accuracy, computers are said to be the slaves of human beings. Why?

Question 7.
Name the four waste disposal methods.

Question 8.
What are the features of RAM?

Question 9.
Problem-solving by computer proceeds through different stages. Name the stages in the correct order.

Question 10.
Write the output of the following C++ expressions.

Let a = 7, b = 2 ’
a. a + b * 3 / ++b;
b. a < = 7 && b > 1;

Question 11.
Detect and correct the errors in the following C++ code.

# include<iostream> 
using name space std; 
int main ( );
int a, b;
cout<< “Enter two numbers”; 
cin>>a and b; a + b = c;
cout<< “Sum =”<<c; 
return 0;
}

Question 12.
Rewrite the following code using a switch case statement.

if(Lan==‘M’)
cout<<‘i prefer Malayalam”;
else if (Lan == ‘E’)
cout<<“l prefer English”;
else cout<<“l prefer neither Malayalam
nor English”;

Question 13.
There are many advantages of using networked computers instead of standalone computers. Write any four advantages of them.

Question 14.
What is the importance of the TCP/IP protocol in computer networks?

Question 15.
Write any two drawbacks in using social media.

Question 16.
eBusiness has many possibilities in the business world, but it faces some challenges. Write about any two challenges in e-Business.

Answer any nine questions from 17 to 27

Question 17.
If (M)₈ = (96)₁₀ = (N)₂ , find M and M.
(M)₈ = (96)₁₀ = (N)₂

Question 18.
Following is a flowchart to find the sum of the first 50 natural numbers.
a. Correct the flowchart if there are errors.
b. Redraw the flowchart to find the sum of even numbers between 1 and 50.

Question 19.
What is debugging? Which are the different types of errors that may occur in a program?

Question 20.
a. What is a token in C++?

b. Distinguish between keywords and identifiers.

Question 21.
Data types are necessary to declare variables in C++.
a. What is a data type?
b. Write the classification of fundamental data types in C++.

Question 22.
Write a short note on arithmetic and logical operators in C++.

Question 23.
a. Write the equivalent arithmetic operations for the given C++ shorthands.

b. What is the difference between a=20 and a==20?

Question 24.
Write a C++ program to find the sim pie interest of an amount (P) deposited with a rate of interest (R) for a period of years (N). A rate of interest = 7% if deposit amount P is less than 1 lakh. A rate of interest = 8% if deposit amount P is between 1 lakh and 5 lakhs. A rate of interest = 9% if the deposit amount P is above 5 lakhs. (Hint: Simple interest = P × N × R/100)

Question 25.
a. Give the output of the following code.

for(i= 10; i<30; i+ = 3)
{
cout<<i<<“\t”;
}

b. Rewrite the code using while loop, while

Question 26.
Explain briefly about the wireless broadband connectivity methods used for internet connection.

Question 27.
e-Leaming allows us to overcome many limitations of the conventional teaching-learning process.
a. Name any three eLearning tools for enhancing the e-Learning process.
b. Write any three advantages of eLearning.

Answer any two questions from 28 to 30

Question 28.
a. Write a detailed classification of software.
b. Some programming languages use compiler whereas some use interpreter. What makes them different?
c. What do you mean by free software?

Question 29.
a. What is a type conversion ? Which are the two ways of type conversion?

b. Define type casting.

c. Consider the C++ code.

p = 7, q = 2; float a, b;
a = p/q;
b = (a+q)/q;
Find the values of’a and b.

Question 30.
a. Define the term topology.
b. Consider that, your principal has decided to network your computer lab. Which topology will you suggest? Justify your answer.
c. Differentiate between LAN and WAN.

Answers

Answer 1.
information

Answer 2.
Universal Serial Bus

Answer 3.
Algorithm

Answer 4.
Header files

Answer 5.
a. DOS

Answer 6.
Yes. Many people think that the computer has superhuman capabilities. However, this is not true. A computer does not have natural intelligence as humans have. A computer cannot decide on its own.

Answer 7.

1. Reuse: It refers to second-hand use or usage after the equipment has been upgraded or modified.
2. Incineration: It is a controlled and complete combustion process in which the waste is burned in specially designed incinerators at a high temperature in the range of 900 to 1000 degree Celsius.
3. Recycling: It is the process of making or manufacturing new products from a product that has originally served its purpose.
4. Landfilling: In this method, the soil is excavated from the trenches made and waste material is buried in it, which is covered by a thick layer of soil.

Answer 8.
The microprocessor can read from and write to RAM. Data can be stored and retrieved at random from anywhere within the RAM, no matter where the data is. The contents of RAM are lost when power is switched off. Therefore, RAM is a volatile memory. The speed of a RAM refers to how fast the data in memory is accessed and expressed in MegaHertz (MHz).

Answer 9.
Problem identification, preparing algorithms and flowcharts, coding the program, translation, debugging.

Answer 10.
a. 9
b. True / 1

Answer 11.

# include<iostream> 
using namespace std; 
int main ()
int a, b, c;
cout<< “Enter two numbers"; 
cin>>a>>b; c = a + b;
cout<< “Sum =”<<c; return 0;
}

Answer 12.

switch (Lan)
{
case‘M’: cout<<“I prefer Malayalam";
break;
case ‘E’: cout<<“l prefer English”; break;
default:cout<<“l prefer neither Malayalam nor English";
}

Answer 13.
The advantages of networks are:

1. Resource sharing: All the computers in a network can share software.
2. Reliability: If one computer fails, the other computer can perform the work without any delay.
3. Price Vs Performance: Instead of a main frame 10 personal computers are used with less cost and same performance.
4. Communication medium: It has a powerful communication medium. We can exchange information between computers in a network.
5. Scalable: System performance can be increased by adding computers to a network.

Answer 14.
Transmission Control Protocol (TCP) uses a set of rules to exchange\messages with other internet points at time information packet level. When data is to be sent from one computer to another over the internet, it is first broken into smaller packets by TCP and then sends. When these packets are received by the receiving computer, TCP submits a request for retransmission else packets are assembled into the original message according to the rules specified in the TCP protocol. Delivery of each packet to the right destination is done by Internet Protocol (IP).

Answer 15.

1. Intrusiontoprivacy.The personal information (photo, e-mail id, phone number, name, address etc.) posted on such sites can be used for illegal activities.
2. Addiction to such sites wastes our valuable time.
3. Spread rumors. Social media will spread the news quickly.

Answer 16.

1. A good percentage of the population is unaware of IT applications and its uses. Most of the regular Internet users also lack knowledge about online business and its possibilities.
2. Most of the customers, especially to the rural population, do not possess plastic money such as credit card, debit card and net banking system, which is necessary for e-Business.
3. If not Used with caution, customers may lose valuable information like their credit card number, passwords, etc.
4. Products like apparel, handicrafts, jewelry, etc are often purchased after examining physically. But in online shopping, customers don’t have this touch and feel advantage.
5. For the success of e-Business of any organization or company perfect and efficient shipment service is a necessity.

Answer 17.

Answer 18.

Answer 19.
It is the stage where programming errors are discovered and corrected, programming errors are known as ‘bugs’and the process of detecting and correcting these errors is called debugging.

The error messages may be displayed by the error-handling function of the language. These errors are known as a runtime error. These errors can be rectified by providing instruction for checking the validity of the data before it gets processed by the subsequent instructions in the program.

The logical error is due to the improper planning of the program’s logic. The language processor successfully translates the source code into machine code if there are no syntax errors. The computer actually follows the program instructions and gives the output as per the instructions. But the output may not be correct. This is known as logical errors.

The error messages may be displayed by the error-handling function of the language. These errors are known as a runtime error. These errors can be rectified by providing instruction for checking the validity of the data before it gets processed by the subsequent instructions in the program.

Answer 20.
a. Tokens or lexical units are the fundamental building blocks of the program. C++ has five types of tokens. They are keywords, identifiers, literals, punctuators, and operators.
b. Identifiers are the user-defined words that are used to name different program elements such as memory locations, statements, functions, objects, classes etc.
The words (tokens) that convey a specific meaning to the language compiler are called keywords. These are also known as reserved words as they are reserved by the language for special purposes and cannot be redefined for any other purposes.

Answer 21.
a. The data type specifies the nature of
data we have to store, the set of operations that can be performed on the data. Predefined data types in C++ are char, int, float, double and void, b. int data types; Integers are whole numbers without a fractional part: They can be positive, zero or negative. The keyword int represents integer numbers. It allows 4 bytes of memory.

char data types. All letters, digits, special symbols, punctuations, etc. come under this category. When these characters are used as data they are considered as char type data in C+ +. The keyword char represents character type data, void data type. The data type void is a keyword and it indicates an empty set of data. It does not require any memory space, float data types.

Numbers with a fractional part are called floating point numbers. The keyword float is used to denote such numbers. It allows 4 bytes of memory, double data type. It is used to store large real numbers. It uses 8 bytes of memory. It can be represented as double.

Answer 22.
Arithmetic operators: These are defined to perform basic arithmetic operations such as addition, subtraction, multiplication, and division. The symbols used for this are +,* and / respectively. It provides a special operator, % (modulus operator) for getting remainder during division.
Logical operators: Used to combine relational operations and it gives either true or false.

Answer 23.
a. i. x = x % 20;
ii. a = a + 2;
iii. p = p/5;
b. A specific data is stored in memory lo-cations (variables) using assignment op-erator (=). Here the value 20 is stored in the variable
a. == (equal to) is a relational operator used for comparing numeric data. Here the value 20 is compared with the value stored in the variable a.

Answer 24.

# include <iostream>'
using namespace std; 
int main()
{ 
int P, N, R; 
float SI;
cout << “Enter the values of P and N:”; cin >> P>>N; 
if (P< 100000)
{
SI = (P*N*7)/100;
cout << “Simple Interest is”<<SI;
}
else if (P>100000 && P<500000)
{
SI = (P*N*8)/100;
cout << “Simple Interest is”<<SI;
}
else if (P>500000)
{
SI = (P*N*9)/100;
cout << “Simple Interest is"<<SI;
}
return 0;
}

Answer 25.
a. 10, 13, 16, 19, 22, 25, 28 b. i = 10;

while (i<30)
{
cout<<i<<“\t”;
i+=3;
} '

Answer 26.
Satellite Broadband. Here the internet connectivity is provided through a satellite. A VSAT (Very Small Aperture Terminal) dish antenna and a transceiver (transmitter-receiver) required at the user’s side. Speed up to 1 Gbps. Used in banks, stock exchange etc.

Mobile broadband is wireless internet access using mobile phones, tablets, USB modems etc. The modems are built inside the mobile phones, tablets. You can use the internet when you are in traveling. The mobile technologies use here are 2G, 3G, and 4G.

Wimax (World Wide Interoperability for Microwave Access). The whole area of a city can be provided with wireless internet using WiMax. It uses the base station for transmitting WiMAX signals and Wimax receivers for receiving the signal. Speed ‘ up to 70 Mbps.

Answer 27.
a. Online chat, Educational TV channels, Electronic books reader (e-Books) b. 1. eLearning has the ability to offer courses on a variety of subjects to a large number of students from a distant location.
2. In e-Learning, a cost for learning is much less. It saves journey time and money, instructor fees, etc.
3. People with limited financial resources are very much supported by the lower cost of e-Learning.

Answer 28.
a. Software is a general term used to denote a set of programs that help us to use a computer system and other electronic devices efficiently and effectively. The two types of softwares are:
1. System software: It is a set of one or more programs designed to control the operations of a computer.

• Operating system: It is a set of programs that acts as an interface between the user and computer hard ware.
• Language processors: The instructions to the computer are written in different languages. Various language processors are:

a. Assembler: It converts languages written in assembly language into machine language.
b. Interpreter: It converts a high-level language into machine language by-line by line.
c. Compiler: It translate a high level language into machine language by converting all the lines at a time.

• Utility software: A set of programs which help users in system maintenance tasks and in performing tasks of routine nature. Utility programs are compression tools (WinZip, Win RAR), disk defragmenter (rearranges files on a computer hard disk), backup software.

2. Application software: It is tHe software developed for a specific application. It ineludes general purpose software\(Word Processing software, spreadsheet sbftware, presentation software, database, multimedia), specific purpose software (designed to handle particular tasks).
b. Compiler: It translate a high level lan-guage into machine language by converting all the lines at a time. The errors are provided at the end of the compilation. The programming language that have a compiler are C, C++, Pascal, etc.

Interpreter: It converts a high level language into machine language by line by line. If there is an error in one line, it reports and the execution is terminated. It will continue the translation only after the correction of the error, eg., BASIC is an inter-preted language.
c. It gives the user the freedom to use, copy, distribute, examine, change and improve the software.

Answer 29.
a. Type conversion is the process of con-verting the current data type of a value into another type. It may be implicitly and explicitly converted.
It can be done in two ways:
1. Implicit type conversion: It is performed by C++ compiler internally. In expressions where different types of data are involved, C++ converts the lower sized operands to the data type of the highest sized operand. Since the conversion is always from lower type to higher, it is also known as type promotion.

2. Explicit type conversion: Sometimes the programmer may decide the data type of the result of an evaluation. This is done by the programmer by specifying the data type within parentheses to the left of the operand. Since the programmer explicitly casts a data to the desired type, it is also known as type casting. Usually, type casting is applied on the variables in the expressions.
b. Sometimes the programmer may decide the data type of the result of an evaluation.

This is done by the programmer by sSpecitying the data type within parentheses to the left of the operand. Since the programmer explicitly casts a data to the desired type, it is also known as type casting.
c. a = 3.0 or 3
b = 2.5

Answer 30.
a. Physical or logical arrangement of computers on a network is called structure or topology.
b. Bus topology. All the computers are at-tached to a single cable called the bus. Here one computer transmits all other computers listen. Therefore it is called the 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 remows computer is very easy. It requires less cable length and the installation cost is less,
c. Local Are Network (LAN): This is used to connect computers in a single room or buildings of one location by using twisted pair wire or coaxial cable. Data transfer rate is high and an error rate is less.

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 Microwave station or satellites. The error rate in rate in data transmission is high, eg., internet.

Plus One Computer Application Previous Year Question Papers and Answers

Kerala Plus One Computer Science Model Question Paper 3

Answer all question from 1 to 5

Question 1.
The computing machine developed by Balaise Pascal is known as ………………………………..

Question 2.
The conditional operator is ……………… opera­tor.

Question 3.
Write the name of the header file which contains the exit( ) function.

Question 4.
……………. is stored at the end of the string.

Question 5.
A short distance wireless internet ac­cess method is…

Answer any nine questions from 6 to 16

Question 6.
Compare the Roman number system and Mayan’s number system.

Question 7.
If (X)₂ – (1o1o)₂ = (1ooo)₂ then find X.

Question 8.
Describe the use of electronic spread­sheets.

Question 9.
Differentiate between top-down design and bottom-up design in problem solv­ing.

Question 10.
Some of the literals in C++ are given below. How do they differ?

Question 11.
What will be the result of the following if ans is 6 initially?

1. cout <<ans = 8 ;
2. cout << ans == 8;

Question 12.
Write a C++ code segment to input val­ues into the array:

Question 13.
Predict the output of the following code segment:

char str[] = “program”;
for (int i=o; str[i] != ‘\o’; ++i)
{
putchar(str[i]);
putchar(‘-’);
}

Question 14.
Write down the output of the following code segment:

puts(“hello”);
puts(“friends”);

Question 15.
How can multimedia content be sent using mobile phones?

Question 16.
What are the functions of the mobile oper­ating system?

Answer any nine questions from 17 to 27

Question 17.
Find dual of following Boolean expressions:

1. X. Y + Z
2. C + A.1 + A.C
3. (A+o).(A.1. A )

Question 18.
Fill in the blanks

1. (———– )₂ = (AB)_l6
2. (__ D__ )_l6 = (1010_____ 1ooo)₂
3. 2510 = (______ )₂

Question 19.
Differentiate compiler and interpreter.

Question 20.
Draw a flowchart to input ten different numbers and find their average.

Question 21.
Write a C++ program to check whether the given number is prime or not.

Question 22.
In how many ways can a variable be declared in C++?

Question 23.
Write a program to find the largest among the three numbers.

Question 24.
Write a C++ program to find the sum of major diagonal elements of a matrix,

Question 25.
What are the differences between the linear search method and the binary search method?

Question 26.
What are the advantages of the modular style of programming?

Question 27.
Distinguish between exit( ) function and return statement.

Answer any two questions from 28 to 30

Question 28.
Define the term green computing. List and explain the approaches that you can adopt to promote green computing concepts at all possible levels.

Question 29.
Write a program using a nested loop that inputs a number n which generates an output as follows. [Hint: If the value of n is 5, the output will be as]

Question 30.
What is network protocol? Explain.

Answer

Answer 1.
Pascaline

Answer 2.
ternary

Answer 3.
process.h

Answer 4.
The null character ‘\o’

Answer 5.
Wimax

Answer 6.
The Romans used 7 letters (I, V, X, L, C, D, and M) of the alphabet for representing numbers.
The Mayans used a number system with base 20. It is the sum of the number of fingers and toes. This number system could produce very accurate astronomical observations and make measurements with greater accuracy.

Answer 7.
(X)₂ – (1o1o)₂ = (1ooo)₂
(X)₂ – 10 = 8
18 – 10 = 8
(18)₁₀= (1oo1o)₂ = (X)₂

Answer 8.
Spreadsheet software allows users to perform calculations using spreadsheets. eg., Microsoft Excel, Open Office calc, Lotus 1-2-3, and Apple numbers.

Answer 9.
Top-down design: It is the process of breaking the overall procedure or task into component parts (modules) and then subdividing each component module until the lowest level of detail is reached. It is also called top-down decomposition.
Bottom-up design: Once the overall procedure or task is broken down into component parts (modules) and each component module are further subdivided until the lowest level of detail has been reached, we start solving from the low­est module onwards. The solution for the main module will be developed only after designing a specific solution to its submodules.

Answer 10.
5 is an integer literal.
‘5’ is a character literal.
5.0 is floating point literal.
“5” is string literal.

Answer 11.

1. 8
2. The result will be o (false) because of 6
3. is not equal to 8.

Answer 12.

for (int i=o; i<50; i++)
{
cin>>ar[i];
}

Answer 13.
p-r-o-g-r-a-m-

Answer 14.
hello friends

Answer 15.
Multimedia Messaging Service (MMS) is the standard way to send and receive messages consisting of multimedia con­tent using mobile phones.

Answer 16.
It is an OS used in handheld devices such as a smartphone, tablet, etc. It man­ages the hardware, multimedia func­tions, internet connectivity, etc. eg., Android, iOS.

Answer 17.
a. X + Y.Z
b. A + C . A+o . A + C
c. (A . l) + (A + o + \( \bar { A } \))

Answer 18.
a. A → 1010, B → 1011
(1010101l)₂
b. (AD8)₂₆ = (1010 1101 1ooo)₂
c. (o.o1)₂

Answer 19.
Compiler: It translates a high-level language into machine language by converting all the lines at a time. The errors are provided at the end of the compilation. The programming language that has a compiler are C, C++, Pascal, etc.
Interpreter: It converts a high-level language into machine language by-line by line. If there is an error in one line, it reports and the execution is terminated. It will continue the translation only after the correction of the error, eg., BASIC is an interpreted language.

Answer 20.

Answer  21.

#include<iostream>
#include<cstdlib>
using namespace std; int main()
{
int i, num;
cout<<“Enter the number: cin>>num;
for(i=2; i<=num/2; ++i)
}
if(num%i == o)
{
cout<<“Not a Prime Number”; exit(o);
}
}
cout<<“Prime Number”; return 0;
}

Answer 22.
In C+ +, variable can be declared in three ways. They are:

• Uninitialized variable, eg., int a;
• Initialised variable, eg., int a = 2;
• Dynamically initialized variable,
• eg., int a = b + 10;

Answer 23.

#include <iostream> 
using namespace std;
 int main( )
{
int a, b, c;
cout << “Enter three different num­bers: ”;
cin >>a>>b>>c;
 if (a > b)
{
if (a > c)
cout<<“The largest number is:”<< a; else
cout << “The largest number is:”<<c;
}
else
{
if Ob > c)
cout << “The largest number is:”<<b; else
cout << “The largest number is: ”<<c;
}
return o;
}

Answer 24.

#include <iostream> 
using namespace std; int main( )
{ int mat[io][io], n, i, j, s=o;
cout<<“Enter the rows/columns of square matrix: ”; 
cin> >n;
cout<<“Enter the elements\n”; for(i=o; i<n; i++)
for(j=o; j<n; j++) 
cin> >mat[i][j];
cout<<“Major diagonal elements are\n”;
for(i=o; i<n; i++)
{
cout<<mat[i][i]<<“\t”; 
s = s + mat[i][i];
}
cout<<“\nSum of major diagonal elements is: 
cout<<s; 
return o; 
}

Answer 25.
Linear search method:

• The elements need not to be in any or­der.
• Takes more time for the process.
• May need to visit all the elements.
• Suitable when the array is small.

Binary search method:

• The elements should be in sorted or­der.
• Takes very less time for the process.
• All the elements are never visited.
• Suitable when the array is large.

Answer 26.

• It reduces the size of the program
• Less chances of error.
• Modularization reduces program­ming complexity.
• Improves reusability.

Answer 27.
The return statement returns a value to the calling function and transfers the program control back to the calling function.
The exit( ) function terminates the ex­ecution of the program itself.

Answer 28.
Green computing is the study and prac­tice of environmentally sustainable computing or IT. To promote green computing, there are 4 approaches are used. They are:

1. Green design: Designing energy effi­cient and eco-friendly computers and devices.
2. Green manufacturing: Minimising waste during the manufacturing of IT devices.
3. Green use: Minimising the electric­ity consumption of computers.
4. Green disposal: Reconstructing used computers or appropriately disposing off or recycling unwanted electronic equipment.

Answer  29.

#include<iostream>
using namespace std;
int main( )
{
int n, i, j, s;
cout<<“Enter the value of n”; cin> >n;
for (i=n; i>=i; i- -)
{
for (j=n; j>=i; j- -)
{
s = j * j;
cout<<s<<“\t”;
}
cout< <“\n”;
}
return o;
}

Answer 30.
A protocol is a collection of rules and regulations to transfer data from one location to another. Different types of protocols are:

1. Transmission Control Protocol (TCP): It uses a set of rules to exchange mes­sages with other internet points at the information packet level.
2. Internet Protocol (IP): It uses a set of rules to send and receive messages at the internet address level.
3. File Transfer Protocol (FTP): It is used for transferring files between comput­ers connected to local network or internet.
4. Hyper Text Transfer Protocol (HT­TP): It is a protocol used for WWW for enabling the web browser to access the web server and request HTML documents.

Plus One Computer Science Previous Year Question Papers and Answers