#### T2 - Heat

6th Standard

Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 60

Part - A

3 x 1 = 3
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. Fill in the blanks

3 x 1 = 3
5. Heat flows from a ____________ body to a ____________ body.

()

heater

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

()

temperature.

7. The SI unit of temperature is ___________________.

()

kelvin

8. True or False

3 x 1 = 3
9. Heat is a kind of energy that flows from a hot body to a cold body.

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

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

(a) True
(b) False
12. Part - B

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

14. What is temperature?

15. Part - C

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

17. Distinguish between heat and temperature.

18. Part - D

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

20. 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?