1. Which one of the following gases is used in combustion?

2. The burning of LPG is an example of

3. A temperature at which the substance burns is called

4. Which is non-renewable source of energy'?

5. Which of the following is not a fossil fuel?

6. Which gas helps in the process of combustion?

7. The amount of heat energy produced on complete combustion of 1 kg of a fuel is called

8. Which zone represents the partial combustion in candle flame?

9. Burning coal in a closed room will produce

10. Substances which catch fire are called