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Heat Book Back Questions & Answers, Exercises, Solutions, Tests, Quizzes, Videos and Podcasts for Class 8 | Unit 1 | Physics | Science | Samacheer Kalvi – English Medium

8th Standard Samacheer Kalvi Physics New Book Back Questions & Answers: https://www.thelearning.app/samacheer-kalvi-english-medium/class-8/science-3/heat-2/exercises

Podcasts: https://www.thelearning.app/samacheer-kalvi-english-medium/class-8/science-3/heat-2/videos

Tests & Quizzes: https://www.thelearning.app/samacheer-kalvi-english-medium/class-8/science-3/heat-2/tests

Flash Cards: https://www.thelearning.app/samacheer-kalvi-english-medium/class-8/science-3/heat-2/flashcards

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00:00 Introduction
00:11 Choose the correct answer
02:53 Fill in the blanks
05:22 True or False
09:04 Match the following
09:42 Assertion and reason

Questions answered in this video –

1. Heat is a form of ________.

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

3. Which of the following substances will absorb more heat energy?

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

5. The process of converting a liquid into a solid is called_________.

6. Conduction is the heat transfer which takes place in a____________.

7. A calorimeter is a device used to measure the________.

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

9. A thermostat is a device which maintains _________.

10. The process of converting a substance from gas to solid is called_________.

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

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

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

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

15. The process of converting a substance from solid to gas is called condensation.

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

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

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

19. Conduction

20. Convection

21. Radiation

22. Sublimation

23. Condensation

24. (A): Radiation is a form of heat transfer which takes place only in vacuum… (R): The thermal energy is transferred from one part of a substance to another part without the actual movement of the atoms or molecules.

25. (A): A system can be converted from one state to another state… (R): It takes place when the temperature of the system is constant.

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