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Expert Teachers at HSSLive.Guru has created Kerala Syllabus Adisthana Padavali Malayalam Standard 10 Solutions Answers Guide Notes 2019-2020 Pdf Free Download of Textbook Questions and Answers, Chapter Wise Notes, Activity Answers, Chapters Summary in Malayalam, Malayalam Study Material, Teachers Hand Book are part of Kerala Syllabus 10th Standard Textbooks Solutions. Here HSSLive.Guru has given SCERT Kerala State Board Syllabus 10th Standard Malayalam Textbooks Adisthana Padavali Solutions Pdf of Kerala SSLC Class 10. Students can also read Kerala Padavali Malayalam Standard 10 Solutions.

Adisthana Padavali Malayalam Standard 10 Solutions Answers Guide Notes

Adisthana Padavali Malayalam Standard 10 Guide

Unit 1 Jivitam Patarttunna Verukal

• Chapter 1 Plavilakkanni
• Chapter 2 Oro Viliyum Kathu
• Chapter 3 Ammathottil

Unit 2 Nilavupeyyunna Nattuvaligal

• Chapter 1 Kochu Chakkarachi
• Chapter 2 Onamuttath
• Chapter 3 Koliyum Kilaviyum
• Chapter 4 Sree Narayana Guru

Unit 3 Vakkukal Vidarunna Pularikal

• Chapter 1 Prataniti
• Chapter 2 Panayam
• Chapter 3 Ammayude Ezhuthukal

We hope the given Kerala Syllabus Adisthana Padavali Malayalam Standard 10 Answers Solutions Guide Notes 2019-20 Pdf Free Download of Textbook Questions and Answers, Chapter Wise Notes, Activity Answers, Chapters Summary in Malayalam, Malayalam Study Material, Teachers Hand Book will help you. If you have any queries regarding SCERT Kerala State Board Syllabus 10th Std Malayalam Textbooks Adisthana Padavali Answers Guide Pdf of Kerala SSLC Class 10, drop a comment below and we will get back to you at the earliest.

You can Download Chemical Change Questions and Answers, Summary, Activity, Notes, Kerala Syllabus 8th Standard Basic Science Solutions Chapter 6 help you to revise complete Syllabus and score more marks in your examinations.

Kerala State Syllabus 8th Standard Basic Science Solutions Chapter 6 Chemical Change

Chemical Changes Questions and Answers

All the changes in nature is divided into physical changes and chemical changes. During a physical change, only a change in the arrangement of molecules occurs. Hence it can be easily brought back to its original state. In the case of chemical changes, new molecules are formed.

The alkali formed by the reaction of sodium with water is sodium hydroxide. Because of its basic nature it becomes pink colour when phenolphthalein is added to it.

In the reaction of magnesium burns in air heat and light are produced.

Chemical Changes Class 8 Kerala Syllabus Thermo chemical reactions

The reaction of magnesium with dil. hydrochloric acid, hydrogen is produced and heat is evolved. So we feel hot when we touch the test tube.
Mg + 2HCl → MgCl₂ + H₂ + heat

Take a few crystals of potassium permanganate in a dry test tube. Heat the test tube. Bring a glowing incense stick to the mouth of the test tube. When potassium permanganate is heated, it decomposes to form potassium mangnate, manganese dioxide. and oxygen. In this reaction, potassium permanganate decomposes with absorption of heat and oxygen is evolved.

Add hydrochloric acid to a concentrated solution of sodium hydroxide taken in a test tube. Heat is evolved. Chemical reactions which liberate heat are called exothermic reactions and those which absorb heat are called endothermic reactions.

Chemical Changes Class 8 Notes Kerala Syllabus Photochemical reactions

Photosynthesis is a chemical reaction that is responsible for sustaining life on earth. In this reaction, plants produce glucose by absorbing light. Note the chemical equation of this reaction.
6 H₂ O + 6 CO₂ + Light → C₆ H₁₂ O₆ + 6 O₂

The glucose thus formed is stored by plants in the form of starch.

Take some silver bromide in watch glasses. That will change to black because silver is precipitated.

Chemical reactions which liberate or absorb light energy are known as photochemical reactions.

Chemical Changes Class 8 Kerala Syllabus Electrochemical reactions

The change in colour of copper sulphate solution and the deposition of copper at the electrode proves that a chemical change has occurred.

In this reaction, copper sulphate decomposed with the absorption of electrical energy. The process in which a substance undergoes decomposition by the absorption of electrical energy is known as electrolysis.

Here, electricity is produced as a result of a chemical reaction between the acid and the metals kept immersed in it. Such arrangements which produce electricity as a. result of chemical reaction are known as electrochemical cells.
We can make cells using a variety of fruits and different metals like zinc. Chemical reactions in which electrical energy is consumed or produced are known as electrochemical reactions.

Chemical Changes Standard 8 Kerala Syllabus Electroplating

You are familiar with the gold plated ornaments that are available in the market. Electricity is used to obtain a thin coating of a particular metal on other metallic objects. This process is called electroplating.

Now, you might have understood that forms of energy like heat, light and electricity are exchanged during chemical reactions. There are chemical reactions which involve the absorption or liberation of energy. Those which absorb energy are known as endoergic reactions and those which liberate energy are known as exoergic reactions.

Energy transfer occurs during any chemical reaction. A chemical reaction will be known based on the major energy form which gets absorbed or liberated.

Kerala Syllabus 8th Standard Chemistry Notes Different types of cells

The cells are the electric source commonly used. Following is the table of cells and their uses

Hsslive Guru Chemistry 8 Kerala Syllabus Environment friendly changes

Many natural and manmade chemical changes that occur around us are not nature – friendly. Nature tries its best to adapt these changes But after a limit it destroy the harmony of nature. The chemicals coming out from the factories will make the problem serious. Hence, accumulation of those materials, which cannot be biodegraded may become a threat even to the existence of life itself. For the sake of posterity, it is the duty of each one of us to protect the earth’from getting polluted.

Chemical Changes Textbook Questions and Answers

Electrolytic water Equipment Factory Question 1.
Assess the chemical reactions given below and answer the questions.
1. Calcium carbonate + heat → Calcium oxide + Carbon dioxide
2. Calcium oxide + water → Calcium hydroxide + heat
a. Mention the reactants and products in each case.
b. Which among these is endothermic? Which one is exothermic?
Answer:
a.Reactants:
1. Calcium carbonate
2. Calcium oxide, water
Products
1. Calcium oxide, carbon dioxide
2. Calcium hydroxide
b.First reaction is endothermic and second is exothermic reaction.

Hsslive Guru 8th Class Chemistry Kerala Syllabus Question 2.
Some chemical reactions are given below. Identify the energy change involved and write down what type of chemical reaction takes place here.
a. Burning of a candle
b. Glowing of a fire fly
c. Plating a copper ring with gold
d. Reaction between potassium hydroxide and sulphuric acid
e. Burning of fuels
Answer:
a. Thermochemical reactions
b. Photochemical reaction
c. Electrochemical reaction
d. Thermochemical reactions
e. Thermochemical reactions

Kerala Syllabus 8th Standard Chemistry Notes Malayalam Medium Question 3.
A student tries to plate an iron nail with copper. Draw its arrangement by selecting the required materials from the list given below.
Silver nitrate, iron nail, copper sulphate, silver rod, copper rod, silver plate, iron sulphate, battery, wire, water, beaker.
Answer:

8th Standard Chemistry Textbook Answers Kerala Syllabus Question 4.
List out the instruments that use electrochemical cells. What are the merits and demerits of using such cells?
Answer:

Std 8 Chemistry Notes Kerala Syllabus  Question 5.
Classify the following into physical changes and chemical changes.
1. Melting of ice.
2. Heating magnesium in water.
3. Silver bromide kept exposed to sunlight.
4. Change happening to soda water on opening its bottle.
Answer:
1. physical change
2. chemical change
3. chemical change
4. physical change

8 Standard Chemistry Notes Kerala Syllabus Question 6.
Give an example each for exothermic and endothermic reactions.
Answer:
Exothermic reaction:
Magnesium + hydrochloric acid → magnesium chloride + hydrogen + heat
Endothermic reaction:
Potassium permanganate + heat → potassium manganate + manganese dioxide + oxygen

Hss Live Guru 8th Chemistry Kerala Syllabus Question 7.
Making a volcano
Heap up some ammonium dichromate powder on a tile. Deposit on it the chemical present on a match stick, and ignite. Write down the changes happening there.
Change in colour: …………………………..
Change in amount: …………………………..
Exchange of energy: …………………………..
Answer:
Change in colour – orange-red Change in quantity – decreases Energy exchange – exothermic

Hsslive Guru Chemistry Class 8 Kerala Syllabus Question 8.
Kindling fire by pouring oil. Heap up some potassium permanganate on a tile. Keep a piece of dry cotton wick on top of it. Pour one or two drops of glycerine on the wick. Observe the changes.
Answer:
potassium permanganate heap burns

Basic Science Class 8 Chapter 6 Kerala Syllabus Question 9.
Take a magnesium ribbon and clean it by scrubbing. Then burn it in air. Collect the product formed and dissolve it in water. Dip litmus papers and pH paper in this solution and observe. Find out the reason for the results of the observations.
Answer:
Red litmus changes to blue. This is because of the magnesium hydroxide produced when magnesium oxide dissolved in water is alkaline.

8th Standard Chemistry Notes Kerala Syllabus Question 10.
Take sodium chloride solution in a beaker. Add to it a few drops of phenolphthalein. With the help of two carbon rods, let electricity pass through the solution. Record your observations. What is your inference?
Answer:
Sodium chloride is decomposed into sodium and chlorine

Question 11.
Take some silver nitrate solution in a test tube and add some sodium chloride solution to it. What is the colour of the precipitate formed? Filter the precipitate using a filter paper, place it on a watch glass and keep it exposed to sunlight. What do you observe?
Try to write down the equation of your observation with the help of your teacher.
Identify the change of energy involved in the second chemical reaction and write down what type of chemical reaction it is.
Answer:
White precipitate. It will become black when it is opened in sunlight.
Energy change: photo chemical reaction

Chemical Changes Additional Questions and Answers

Question 1.
i. sodium + water → sodium hydroxide + hydrogen
ii. Magnesium + oxygen → magnesium oxide
Write the reactants and products of these reactions.
Answer:
i. Reactants: sodium, water
Products: sodium hydroxide, hydrogen
ii. Reactants: magnesium, oxygen
products: Magnesium oxide

Question 2.
What is the observation when two drops of phenolphthalein is added to the solution obtained after the reaction of sodium with water? Justify your answer.
Answer:
The solution becomes pink in colour. The product of the reaction is sodium hydroxide which is alkaline.

Question 3.
Tabulate the following changes into physical and chemical changes

• Water changes to water vapour
• burning wood
• rusting the iron
• explosion of crackers
• cutting the wood
• Magnesium burns in air
• Ice is melting

Answer:
Water changes to water vapour – Physical change
Burning wood – Chemical change
Rusting the iron – Chemical change
Explosion of crackers – Chemical change
Cutting the wood – Physical change
Magnesium burns in air – Chemical change
Ice is melting – Physical change

Basic Science for Class 6 Chapter 6 Question 4.
Tabulate the important energy change in the following reactions.

1. Magnesium burns in air
2. Heating potassium permanganate
3. Photosynthesis
4. Electroplating
5. Reaction between Sodium hydroxide and Hydrochloric acid
6. Glittering the fire fly
7. Reaction in electrochemical cells

Answer:

1. Liberates heat energy
2. Absorbs heat energy
3. Absorbs light energy
4. Absorbs electric energy
5. Liberates heat energy
6. Liberates light energy
7. Liberates electric energy

Iron Sulphate Question 5.
Examine the following substances and draw the figure which shows the arrangement of coating silver on an iron ring Gold wire, silver rod, iron ring, copper sulphate, solution of silver cyanide and gold cyanide battery, beaker
Answer:

Question 6.
Some medicines and chemicals are kept in dark bottles, why?
Answer:
To prevent the chemical change due to the absorption of light

Question 7.
What is elecroplating? How are the electrode and the electrolyte selected when a metallic object is to be plated with another special metal?
Answer:
To obtain a thin coating of a particular metal on another metallic object using electricity is known as electroplating.

The metal to be plated is taken as the positive electrode. The electrolyte is a solution of salt containing the metal to be plated. The negative electrode is the metallic object to be plated.

Question 8.
What is your observation when a glowing in inscent stick is brought to the mouth of test tube containing potassium permanganate which is heated? Give reason.
Answer:
The stick flares up. When potassium permanganate is heated, it decomposes to form potassium manganate, manganese dioxide and oxygen.

Question 9.
Give an example each for the reaction of liberation of heat and absorption of heat from daily life.
Answer:
Exothermic reaction: Burning of wood
Endothermic reaction: Marble is heated to quick lime

Question 10.
How electrical energy is produced by batteries?
Answer:
Tn a battery, electrical energy is produced by the chemical reaction between zinc and sulphuric acid or by zinc and carbon. Electrical energy is produced by chemical reactions. Here chemical energy is converted to electrical energy.

Question 11.
Photosynthesis is the reaction that responsible to sustain life on the earth. Write the equation of the reaction. What is the energy change in it?
Answer:
6H₂O + CO₂ → C₆H₁₂ O₆+ 6O₂
Light energy is absorbed in it.

Question 12.
Complete the figure given below

Answer:

Question 13.
Acid is added to water for its electrolysis. Why?
Answer:
Pure water is not an electric conductor. But if some acid, alkali or salt is added, lot of ions are formed in it and water will become an electric conductor.

Question 14.
When electricity is passed through copper sulphate solution using carbon electrodes kept in the solution, it decomposes.
A. By what name this process in known?
B. In which electrode is copper deposited dining the reaction?
C. Is there a colour change for the solution?
Answer:
a. Electrolysis
b. Negative electrode
c. The colour of the solution decreases.

You can Download Magnetism Questions and Answers, Summary, Activity, Notes, Kerala Syllabus 8th Standard Basic Science Solutions Chapter 11 help you to revise complete Syllabus and score more marks in your examinations.

Kerala State Syllabus 8th Standard Basic Science Solutions Chapter 11 Magnetism

Nowadays artificial magnets are used commonly. They are made by the alloy like alnico.

A magnet possesses directional property that a freely moving magnet always aligns itself in the north-south direction. If a magnet is arranged in such a way that it can move freely it will align itself in the north-south direction of the earth. It is because a magnet possesses directional property that a freely moving magnet always aligns itself in the north-south direction.

As far as magnets are concerned, like poles repel each other and unlike poles attract each other.

A compass is an instrument which is utilised the directional property of a magnet. Every magnet has two poles even if they are very small.

Magnetism Class 8 Notes Chapter 11 Kerala Syllabus Earth as a magnet

The earth acts like a large magnet. This was first discovered by the scientist William Gilbert. He found out that just as the earth has north and south geographically, it has the north pole and the south pole when considered as a magnet. The south pole of the earth’s magnet is near the geographic north pole and the north pole of the earth’s magnet is near the geographic south pole.

Magnetism Class 8 Notes Kerala Syllabus Chapter 11 Magnetic field

Magnetic lines of force are experienced in all dimensions around a magnet. The magnetic lines of force is experienced according to the strength of the magnet. Magnetic force is experienced in all dimensions around a magnet. This region around a magnet where the influence is felt is the magnetic field.

The flux density is the number of flux lines passing through unit area.

Kerala Syllabus 8th Standard Physics Notes Chapter 11 peculiarities of magnetic lines of force.

1. Magnetic lines of force do not intersect one another.
2. Magnetic lines of force bend sideways, when like poles of magnets come near each other.
3. When unlike poles of magnets come close to each other, the path of the magnetic lines of force is from the north pole of one magnet to the south pole of the other magnet.

The substances which are attracted by magnet is called magnetic substances.

Questions On Magnetism For Class 8 Kerala Syllabus Chapter 11 Magnetic Induction

Bring a pin in contact with the pole of a bar magnet. Is it not attracted? What if you bring another pin to the free end of the pin? It will also be attracted. If we bring another pin the second pin will attract the third. But when the first pin is removed from the magnet all pins will fall down. That is the pin acquired the magnetic force from the magnet.

The phenomenon of a magnetic substance acquiring magnetism due to the presence of a magnet is Magnetic Induction. The magnetic force acquired by the magnetic substance is the Induced Magnetism.

Whether under contact or without contact, the polarity of the magnet produced by induction will be like polarity at the further end and unlike polarity at the nearer end.

The ability of magnetic substances to get magnetised under the influence of a magnetic field is Susceptibility. Retentivity is the ability to retain the magnetism thus acquired. Soft iron has high susceptibility. But the ability to retain magnetism acquired (retentivity) is very low.

Permeability is the ability of substances to pass magnetic lines of force through them.

The ability of soft iron to permit magnetic lines of force pass through it is greater than that of air. That is, magnetic lines of force pass more easily through soft iron than through air.

Std 8 Physics Magnetism Notes Kerala Syllabus Chapter 11 Electromagnet

Electromagnets can be made by passing electric current through insulated copper wire wound on a soft iron piece. The strength of electromagnets made in this way depends on

• the number of turns of coiled conductor
• the strength of current
• the area of cross section of the soft iron placed inside the coil

All electromagnets are temporary magnets. If the current ceases to flow, the magnetism of the soft iron core is lost.

Magnetism Textbook Questions and Answers

Magnetism Chapter Class 8 Kerala Syllabus Chapter 11 Question 1.
In the figure, AB is a bar magnet. CD is a soft iron rod placed near the end B. Write down which poles develop at the ends C and

Answer:
C-north ,D-South

Class 8 Physics Notes Kerala Syllabus Chapter 11 Question 2.
Figures A and B show two iron nails each hanging from a bar magnet and a U shaped magnet.

a. Identify the correct picture in A and B.
b. Justify your answers.
Answer:
a. A – Fig III B – Fig II
b.In A two nails are hang from bar magnet. So the distant ends will be induced the same pole. So repulsion. But in U magnet at the distant opposite poles will be induced. So attraction.

Hsslive Guru 8th Class Physics Kerala Syllabus Chapter 11 Question 3.
You are given a soft iron piece, a steel piece of the same size, insulated copper wire and a battery.
a. Explain how a strong permanent magnet can be made.
b. Suggest a method to make a temporary magnet.
Answer:
a. Take a piece of steel and bind a insulated copper wire. Connect the ends of the wire to a cell
b. Wind a few turns of insulated copper wire on an iron nail. Connect the ends of the wire to a cell

Basic Science Class 8 Chapter 11 Kerala Syllabus  Question 4.
Can you build a compass and make it work by arranging a magnetic needle in such a way that it rotates freely inside an iron case? What is the reason?
Answer:
No. As the iron is a magnetic substance compass will not rotate freely.

Hss Live Guru 8th Physics Kerala Syllabus Chapter 11 Question 5.
In an exhibition, a plastic car with an iron piece fixed inside it is made to run on a wooden table by sliding a strong magnet below it. The experiment failed when a steel table was used instead. Explain the reason.
Answer:
Steel table has high permeability. It permit magnetic flux to pass through it. Therefore we cannot slide the car using magnet.

Magnetism Additional Questions and Answers

Class 8 Science Notes Kerala Syllabus Chapter 11 Question 1.
Name the following magnet.

Answer:
a. Bar magnet,
b. compass,
c. U magnet,
d. Ring magnet,
e. Magnetic plate

8th Class Biology Notes Pdf Malayalam Medium Chapter 11 Question 2.
Which instrument is used to identify the direction in ship journey in ancient time?
Answer:
Compass

8th Class Biology Notes Pdf Kerala Syllabus Chapter 11 Question 3.
A bar magnet is hanged by a thread. Where does the north pole of the magnet point?

Answer:
The north pole of the compass points towards north of the earth that is south pole of earth’s magnet be¬cause earth is a magnet.

Kerala Syllabus 8th Standard Physics Notes Pdf Chapter 11 Question 4.
Write the magnetic substances from the following.
Wooden block, iron nail, paper, nickel, gold, cobalt, aluminium
Answer:
Iron nail, nickel, cobalt

Kerala Syllabus 8th Standard Chemistry Notes Chapter 11 Question 5.
Write the right statement
Greater susceptibility (Soft iron/Steel)
Greater retentivity? (Soft iron/ Steel)
Answer:
a. Soft iron b. Steel

Magnetism Chapter for Class 6 Question 6.
Write three method to increase the strength of an electromagnet.
Answer:

• the number of turns of coiled con ductor
• the strength of current
• the area of cross section of the soft iron placed inside the coil.

Magnetism Textbook Question 7.
You are given a bar magnet. The poles are not marked on it. Suggest a method to identify the poles of the magnet.
Answer:
The magnet is suspended using a thread so that it can oscillate freely in a horizontal plane. When it comes to rest the end pointing south can be marked as south pole.

Magnetism Solutions Question 8.
A magnet is dipped in iron filing, the iron fillings are more attracted towards the poles of the magnet than towards other places. Why?
Answer:
The intensity at the poles is greater than that at other places.

Question 9.
North of geomagnet inclined against 110 with geoscientific north pole? Examine the statement.
Answer:
The statement is incorrect. North of geomagnet inclined against 110 with geoscienfic south pole. Magnet suspended on geomagnet alinged south – north direction is due to the attraction of unlike poles. North pole (N) of magnet attracted towards the south pole of geomagnet.

Question 10.
What are the difference in the magnetic properties of iron and steel?
Answer:
Tron becomes a more intense magnet on magnetic induction. But that magnetic power is temporary. When the permanent magnet is removed it losses its magnetic power. In the presence of a magnet, steel doesn’t acquire the magnetic power like that of a soft iron. But steel retains most of its magnetic power after removing the permanent magnet.

Question 11.
Write your inferences.
a. All magnets have same shape.
b. All magnets show N, S direction when suspended freely.
c. All magnets are man made.
d. All magnets show N, S direction when suspended freely.
Answer:
a. No, There are different types of magnets.
b. Yes, Because the north pole of magnet turns to geographical south of earth and south pole turns to geographical north of earth.
c. No, There are natural and man made magnets.
d. Yes. Earth acts like a large magnet. Hence the poles of the suspended magnet is opposite to the poles of the earth’s magnet.

Question 12.
When an iron nail is wounded with copper wire and connected to a battery, it doesn’t become a magnet, select the reasons from the following.
a. Battery has not enough charge.
b. The insulation at the ends of the wire is not removed.
c. The nail is wounded with non insulated copper wire.
d. The polarity of the battery is changing.
Answer:
a,b,c

Question 13.
An Iron nail is suspended at the
north pole of a bar magnet. Bring the north pole of another magnet near the free end of a nail. What is observed? What is its reason?
Answer:
The free end of an iron nail repel. Because the free end of an iron nail becomes north pole by magnetic induction.

Question 14.
Complete the figure

Answer:

Question 15.
The pole of a magnet attracts an iron nail which has no magnetic power. Describe the work-ing behind this.
Answer:
The magnet attracts the iron nail brought near the pole of a magnet really as the result of magnetic induction. If the magnetic material reaches near the magnetic field of the magnet, an unlike pole is induced at its near end. The pole of permanent magnet is attract the newly formed unlike poles. That is why the magnetic pole attracts a magnetic material near it.

Question 16.
What are the factors that the attractive force of two magnetic poles depend on?
Answer:
The attractive force between the magnetic poles increases with increase in the strength of the pole and decreases with increase in the distance between the poles.

Question 17.
What is meant by atomic mag-nets?
Answer:
Each atom of a magnetic substance is an independent magnet. They are called atomic magnets.

Question 18.
What is meant by line of force (line of flux)?
Answer:
The line of force is the path that the north pole of a free magnetic needle would take around the bar magnet.

Question 19.
Examine the figure and mark the poles

Answer: