1. The sun give us light and heat. 2. We can absorb heat by rubbing two surfaces of some substances .

Question

True or False. If False, give the correct statement:

1. The sun give us light and heat.

2. We can absorb heat by rubbing two surfaces of some substances .

3. In the past people used to rub two wooden pieces together to light fire

4. When we cool the object the temperature of the object will be increased.

5. Two objects are said to be in thermal contact if they can exchange heat energy.

6. The expansion in volume is called linear expansion.

Answer 1

1. True

2. False. We can generate heat by rubbing two surfaces of some substances.

3. False. In the past people used to rub two stones together to light fire.

4. False. When we heat the object the temperature of the object will be increased.

5. True.

6. False. The expansion in length is called linear expansion.