#### Heat Model Questions

6th Standard

Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 30
3 x 1 = 3
1. The unit of heat is

(a)

newton

(b)

joule

(c)

volt

(d)

celsius

2. 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

3. 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.

4. 3 x 1 = 3
5. The hotness of the object is determined by its____________________.

()

temperature.

6. The SI unit of temperature is ___________________.

()

kelvin

7. Solids________________ on heating and______________ on cooling.

()

expand, contract

8. 4 x 1 = 4
9. Heat is a kind of energy that flows from a hot body to a cold body.

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

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

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

(a) True
(b) False
13. 2 x 2 = 4
14. Make a list of electrical equipments at home which we get heat from.

15. What is temperature?

16. 2 x 3 = 6
17. What difference do you think heating the solid will make in their molecules ?

18. Distinguish between heat and temperature.

19. 2 x 5 = 10
20. Explain thermal expansion with suitable examples.

21. 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.