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#### Term 2 Heat Model Question Paper

8th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 30
5 x 1 = 5
1. Heat is a form of ________.

(a)

electrical energy

(b)

gravitational energy

(c)

thermal energy

(d)

None of these

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

(a)

Solid

(b)

Liquid

(c)

Gas

(d)

All the above

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

(a)

Solid

(b)

Liquid

(c)

Gas

(d)

All of them

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

(a)

sublimation

(b)

condensation

(c)

freezing

(d)

deposition

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

(a)

solid

(b)

liquid

(c)

gas

(d)

All of them

6. 3 x 2 = 6
7. What are the effects of heat?

8. Name three types of heat transfer

9. What is conduction?

10. 3 x 3 = 9
11. With the help of a neat diagram explain the working of a calorimeter

12. Write a note on thermostat.

13. Explain the working of thermos flask.

14. 1 x 5 = 5
15. Why does the bottom of a lake not freeze in severe winter even when the surface is all frozen?

16. 1 x 5 = 5
17. An iron ball requires 1000 J of heat to raise its temperature by 20°C. Calculate the heat capacity of the ball.