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• Q.1. Define Combustion and ignition temperature. List conditions under which combustion can take place.
• Q.2. What is caused by burning of wood and coal? Q.3. What type of fire extinguishers should be used to control the fire produced by oil?
• Q.4. Explain how the use of CNG in automobiles has reduced pollution in our cities. Q. 5. Compare LPG and wood as fuels.
• Q.6. Give reasons. (a) Water is not used to control fires involving electrical equipment. (b) LPG is a better domestic fuel than wood.
• (c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
• Q.7. Make a labelled diagram of a candle flame and write a few lines on the same. Q..8. Name the unit in which the calorific value of a fuel is expressed.
• Q.9. Explain how CO2 is able to control fires. Q.10. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
• Q.11. Which zone of a flame does a goldsmith use for melting gold and silver and why?
• Q.12. Can the process of rusting be called combustion? Discuss. + 53 Multiple Choice Questions with Answers