Combustion and Flame Class 8 MCQs Questions with Answers

1. A temperature at which the substance burns is called

2. Out of these, which is able to control fires?

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

4. ………… have very low ignition temperature.

5. Which is non-renewable source of energy’?

6. The burning of LPG is an example of

7. Which zone of a flame does a goldsmith use for melting gold and silver ?

8. Which gas helps in the process of combustion?

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

10. Which is non-combustible substance?

11. _________ fire extinguisher contains sodium bicarbonate + dil. Sulphuric acid.

12. Calorific value of a fuel is expressed in

13. ………… is better domestic fuel than wood.

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

15. ……… of fuel forms poisonous carbon monoxide gas.

16. Acid rain contains mainly

17. Burning coal in a closed room will produce

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

19. Goldsmith uses the ………… zone of the flame for melting gold and silver

20. Substances which catch fire are called