Combustion and Flame Class 8 MCQs Questions with Answers

1. Calorific value of a fuel is expressed in

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

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

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

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

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

7. ………… have very low ignition temperature.

8. Acid rain contains mainly

9. The burning of LPG is an example of

10. Burning coal in a closed room will produce

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

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

13. Which gas helps in the process of combustion?

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

15. Which is non-combustible substance?

16. Substances which catch fire are called

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

18. A temperature at which the substance burns is called

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

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