#### Heat Model Question Paper

6th Standard

Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
4 x 1 = 4
1. When an object is heated, the molecules that make up the object

(a)

begin to move faster

(b)

lose energy

(c)

become heavier

(d)

become lighter

2. The unit of heat is

(a)

newton

(b)

joule

(c)

volt

(d)

celsius

3. One litre of water at 30o C is mixed with one litre of water at 50o C. The temperature of the mixture will be

(a)

80o C

(b)

More than 50°C but less than 80o C

(c)

20o C

(d)

around 40o C

4. An iron ball at 50°C is dropped in a mug containing water at 50o C. The heat will

(a)

flow from iron ball to water.

(b)

not flow from iron ball to water or from water to iron ball.

(c)

flow from water to iron ball.

(d)

increase the temperature of both.

5. 5 x 1 = 5
6. Heat flows from a ____________ body to a ____________ body.

()

heater

7. The hotness of the object is determined by its____________________.

()

temperature.

8. The SI unit of temperature is ___________________.

()

kelvin

9. Solids________________ on heating and______________ on cooling.

()

expand, contract

10. Two bodies are said to be in the state of thermal______________ if there is no transfer of heat taking place.

()

equilibrium

11. 5 x 1 = 5
12. Heat is a kind of energy that flows from a hot body to a cold body.

(a) True
(b) False
13. Steam is formed when heat is released from water

(a) True
(b) False
14. Thermal expansion is always a nuisance.

(a) True
(b) False
15. Borosilicate glass do not expand much on being heated.

(a) True
(b) False
16. The unit of heat and temperature are the same.

(a) True
(b) False
17. 2 x 1 = 2
18. An ordinary glass bottle cracks when boiling water is poured into it, but a borosilicate glass bottle does not.

19. Rivet is heated before fixing in hole to join two metal plates.

20. 4 x 2 = 8
21. Make a list of electrical equipments at home which we get heat from.

22. What is temperature?

23. What is thermal expansion?

24. What do you understand by thermal equilibrium?

25. 2 x 3 = 6
26. What difference do you think heating the solid will make in their molecules ?

27. Distinguish between heat and temperature.

28. 4 x 5 = 20
29. Explain thermal expansion with suitable examples.

30. When a window is accidentally left open on a winter night, will you feel uncomfortable because the cold is getting in, or because the heat is escaping from the room?

31. Suppose your normal body temperature were lower than what it is. How would the sensation of hot and cold change?

32. If you heat a circular disk with a hole, what change do you expect in the diameter of the hole? Remember that the effect of heating increases the separation between any pair of particles.