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#### Heat One Marks Questions

6th Standard

Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 20
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. 4 x 1 = 4
12. Heat is a kind of energy that flows from a hot body to a cold body.

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

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

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

(a) True
(b) False
16. 5 x 1 = 5
17. Heat

18. (1)

0oC

19. Temperature

20. (2)

No heat flow

21. Thermal Equilibrium

22. (3)

joule

23. Ice cube

24. (4)

100oC

25. Boiling water

26. (5)

kelvin

2 x 1 = 2
27. An ordinary glass bottle cracks when boiling water is poured into it, but a borosilicate glass bottle does not.

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