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- 1. Multiple Choice
Which of these are true about combustion
It is a physical process
It has an exothermic reaction
Combustion does not always result in fire
If combustion results as fire it does not create smoke
- 2. Multiple Choice
A good fuel is on which is
Cheap
Produces large number of heat
Readily available
All of these
- 3. Multiple Choice
Combustion always results as flames
True
False
- 4. Multiple Choice
Name combustible substances
Coal
Water
Wood
Sand
- 5. 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
- 6. Multiple Choice
When a magnesium ribbon is burnt, it produces
Magnesium hydroxide
Magnesium oxide
Magnesium chloride
Magnesium sulphate
- 7. Multiple Choice
Which one of the following is combustible?
Iron nail
Glass
Stone pieces
Paper
- 8. Multiple Choice
Which is the hottest part in the candle flame?
Yellow
Wax part
Black
Blue
- 9. Multiple Choice
CNG and LPG are the examples of
Solid fuels
Liquid fuels
Gaseous fuels
They are not fuels
- 10. Multiple Choice
Water cannot be used as a fire extinguisher to put out
Burning coal
Electrical fires
Burning wood
Forest fires
- 11. Multiple Choice
Which substance give heat and light after combustion
Flame
Fuel
Combustion
None of these
- 12. Multiple Choice
Which one of the following is fuel of our body?
Petrol
Diesel
Water
Food
- 13. Multiple Choice
In the presence of water, ignition Temperature of paper is-
Decrease
Increase
Remain constant
None of these
- 14. Multiple Choice
Fire extinguisher-
Raise up temperature of fuel
Bring down the temperature of fuel
Cut off the supply of air
None of these
- 15. Multiple Choice
Good fuel is
Readily available
Cheap
Burn easily in air
All of these
- 16. Multiple Choice
Ideal fuel has ____________ calorific value
Zero
Low
Moderate
High
- 17. Multiple Choice
When water is poured over burning wood, the fire goes off. This is because
temperature of wood decreases
temperature of water goes up
molecules of water reacts with oxygen present in the flame
the flame vapourises
- 18. Multiple Choice
____________________ burns rapidly at room temperature.
Phosphorus
Mercury
LPG
None of these
- 19. Multiple Choice
The previously mentioned burning way or style is a type of combustion named as __________________ Combustion.
Rapid
Spontantaneous
Regular
None of These
- 20. Multiple Choice
Lastly, The sudden reaction that takes place with the evolution of Heat, light and sound, liberating a large amount of Gas along with it is called ____________________.
Explosion
Nuclear Combustion
Explosive Nuclearity
None of These
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