1. A chemical process in which a substance reacts with oxygen to give off heat is called

2. Fuel may be

3. The amount of heat energy produced on complete combustion of_____ fuel is called its calorific value.

4. The substances which have very low ignition temperature and can easily catch fire with a flame are called

5. When we heat water in a paper bowl over a candle, the paper does not catch fire because

6. When oil or petrol catches fire, water is not used to extinguish it because

7. In combustion

8. A person caught fire on clothes is wrapped with blanket because

9. Ignition temperature is

10. Explosion takes place because of