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- 1. Multiple Choice
Burning of charcoal in a closed room will produce
Carbon dioxide
Nitrogen dioxide
Carbon monoxide
Sulphur dioxide
- 2. Multiple Choice
The substances which have very low ignition temperature will
Catch fire easily
Will not catch fire
Catch fire after some time
None of these
- 3. Multiple Choice
Ignition temperature is
Lowest temperature at which a substance catches fire
Highest temperature at which a substance catches fire
Any temperature
1000 C
- 4. Multiple Choice
Combustion is a
Natural process
Chemical process
Physical process
None of these processes
- 5. Multiple Choice
When a magnesium ribbon is burnt, it produces
Magnesium hydroxide
Magnesium oxide
Magnesium chloride
Magnesium sulphate
- 6. Multiple Choice
Which one of the following is combustible?
Iron nail
Glass
Stone pieces
Paper
- 7. Multiple Choice
Which is the hottest part in the candle flame?
Yellow
Wax part
Black
Blue
- 8. Multiple Choice
Fuel may be
Solid
Liquid
Gas
All of the three
- 9. Multiple Choice
Combustion is a reaction in which a substance reacts with
hydrogen
Nitrogen
Oxygen
Chlorine
- 10. Multiple Choice
CNG and LPG are the examples of
Solid fuels
Liquid fuels
Gaseous fuels
They are not fuels
- 11. Multiple Choice
Water cannot be used as a fire extinguisher to put out
Burning coal
Electrical fires
Burning wood
Forest fires
- 12. Multiple ChoiceWood is a better fuel than LPG.TrueFalse
- 13. Multiple Choice
Which of the following fuels has the highest calorific value?
Wood
Coal
Hydrogen
Petrol
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