Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 8th

# Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide chapter 4 - Heat [Latest edition]

## Chapter 4: Heat

Exercise
Exercise [Page 43]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 4 HeatExercise [Page 43]

Exercise | Q I. 1 | Page 43

Fill in the blank

Heat is a form of _______.

• electrical energy

• gravitational energy

• thermal energy

• None of these

Exercise | Q I. 2. | Page 43

If you apply some heat energy to a substance, which of the following can take place in it?

• Expansion

• Increase in temperature

• Change of state

• All the above

Exercise | Q I. 3. | Page 43

Which of the following substances will absorb more heat energy?

• Solid

• Liquid

• Gas

• All the above

Exercise | Q I. 4. | Page 43

If you apply equal amount of heat to a solid, liquid, and gas individually, which of the following will have more expansion?

• Solid

• Liquid

• Gas

• All of them

Exercise | Q I. 5. | Page 43

The process of converting a liquid into a solid is called ________.

• sublimation

• condensation

• freezing

• deposition

Exercise | Q I. 6. | Page 43

Conduction is the way of heat transfer which takes place in a _____.

• solid

• liquid

• gas

• All of them

Exercise [Page 43]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 4 HeatExercise [Page 43]

#### Fill in the blanks.

Exercise | Q II. 1. | Page 43

A calorimeter is a device used to measure the ______.

Exercise | Q II. 2. | Page 43

_______ is defined as the amount of heat required to raise the temperature of 1kg of a substance by 1°C.

Exercise | Q II. 3. | Page 43

A thermostat is a device which maintains _____.

Exercise | Q II. 4. | Page 43

The process of converting a substance from gaseous state to solid state is called _______.

Exercise | Q II. 5. | Page 43

If you apply heat energy, the temperature of a system will _____.

Exercise | Q II. 6. | Page 43

If the temperature of a liquid in a container is decreased, then the interatomic distance will ______.

Exercise [Page 43]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 4 HeatExercise [Page 43]

#### State True or False. If false, correct the statement.

Exercise | Q III. 1. | Page 43

The applied heat energy can be realized as an increase in the average kinetic energy of the molecules.

• True

• False

Exercise | Q III. 2. | Page 43

The dimensions of a substance are increased if the temperature of the substance is decreased.

• True

• False

Exercise | Q III. 3. | Page 43

The process of converting a substance from solid state to gaseous state is called condensation.

• True

• False

Exercise | Q III. 4. | Page 43

Convection is the process by which the thermal energy flows in solids.

• True

• False

Exercise | Q III. 5. | Page 43

The amount of heat gained by a substance is equal to the product of its mass and latent heat.

• True

• False

Exercise | Q III. 6. | Page 43

In a thermos flask, the silvered walls reflect and radiate the heat outside.

• True

• False

Exercise [Page 43]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 4 HeatExercise [Page 43]

Exercise | Q IV. | Page 43

Match the following.

 Conduction Liquid Convection Gas to liquid Radiation Solid to gas Sublimation Vaccum Condensation Solid
Exercise [Page 44]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 4 HeatExercise [Page 44]

Exercise | Q V. 1. | Page 44

Consider the statement given below and choose the correct option.

Assertion: Radiation is a form of heat transfer which takes place only in vacuum.

Reason: The thermal energy is transferred from one part of a substance to another part without the actual movement of the atoms or molecules.

• Both assertion and reason are true and reason is the correct explanation of assertion.

• Both assertion and reason are true, but reason is not the correct explanation of assertion.

• Assertion is true, but the reason is false.

• Assertion is false, but the reason is true.

Exercise | Q V. 2. | Page 44

Consider the statement given below and choose the correct option.

Assertion: A system can be converted from one state to another state.

Reason: It takes place when the temperature of the system is constant.

• Both assertion and reason are true and reason is the correct explanation of assertion.

• Both assertion and reason are true, but reason is not the correct explanation of assertion.

• Assertion is true, but the reason is false.

• Assertion is false, but the reason is true.

Exercise [Page 44]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 4 HeatExercise [Page 44]

Exercise | Q VI. 1. | Page 44

What are the applications of conduction in our daily life?

Exercise | Q VI. 2. | Page 44

What are the effects of heat?

Exercise | Q VI. 3. | Page 44

Name three types of heat transfer.

Exercise | Q VI. 4. | Page 44

What is conduction?

Exercise | Q VI. 5. | Page 44

Write a note on convection.

Exercise | Q VI. 6. | Page 44

Define specific heat capacity.

Exercise | Q VI. 7. | Page 44

Define one calorie.

Exercise [Page 44]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 4 HeatExercise [Page 44]

Exercise | Q VII. 1. | Page 44

With the help of a neat diagram, explain the working of a calorimeter.

Exercise | Q VII. 2. | Page 44

Write a note on thermostat.

Exercise | Q VII. 3. | Page 44

Explain the working of thermos flask.

Exercise [Page 44]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 4 HeatExercise [Page 44]

#### Higher Order Thinking Questions.

Exercise | Q VIII. 1. | Page 44

Why does the bottom of a lake not freeze in severe winter though the surface is all frozen?

Exercise | Q VIII. 2. | Page 44

Which one of the following statements about thermal conductivity is correct? Give reason.

• Steel > Wood > Water

• Steel > Water > Wood

• Water > Steel > Wood

• Water > Wood > Steel

Exercise [Page 44]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide Chapter 4 HeatExercise [Page 44]

Exercise | Q IX. 1. | Page 44

Numerical Problems.

An iron ball requires 1000 J of heat to raise its temperature by 20°C. Calculate the heat capacity of the ball.

Exercise | Q IX. 2. | Page 44

The heat capacity of the vessel of mass 100 kg is 8000 J/°K. Find its specific heat capacity.

Exercise

## Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide chapter 4 - Heat

Tamil Nadu Board Samacheer Kalvi solutions for Class 8th Science Answers Guide chapter 4 (Heat) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Tamil Nadu Board of Secondary Education Class 8th Science Answers Guide solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 8th Science Answers Guide chapter 4 Heat are Heat and Its Unit, Effects of Heat, Transfer of Heat, Convection, Conduction, Radiation, Calorimetry and Calorimeter, Thermostat, Temperatures, Thermos Flask (Dewar Flask), Heat Capacity Or Thermal Capacity, Specific Heat Capacity, Scales of Thermometers.

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