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- 1. Multiple Choice
Which substance give heat and light after combustion
Flame
Fuel
Combustion
None of these
- 2. Multiple Choice
Coal burns with ____________________________
Flame
Only glow
Both flame and glow
None of these
- 3. Multiple Choice
Burning of charcoal in a closed room will produce
Carbon dioxide
Nitrogen dioxide
Carbon monoxide
Sulphur dioxide
- 4. 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
- 5. Multiple Choice
Ignition temperature is
Lowest temperature at catch fire
Higher temperature at catch fire
Any temperature
1000 C
- 6. Multiple Choice
Combustion is a
Natural process
Chemical process
Physical process
None of these processes
- 7. Multiple Choice
When magnesium ribbon burnt it produce
Magnesium hydroxide
Magnesium oxide
Magnesium chloride
Magnesium sulphate
- 8. Multiple Choice
Which one of the following is fuel of our body?
Petrol
Diesel
Water
Food
- 9. Multiple Choice
Which one of the following is combustible?
Iron nail
Glass
Stone pieces
Paper
- 10. Multiple Choice
In the presence of water, ignition Temperature of paper is-
Decrease
Increase
Remain constant
None of these
- 11. Multiple Choice
Which of the following is inflammable Substances?
Petrol
Wood
Paper
Straw
- 12. Multiple Choice
Fire extinguisher-
Raise up temperature of fuel
Bring down the temperature of fuel
Cut off the supply of air
None of these
- 13. Multiple Choice
Which is the hottest part in the flame of the candle
Yellow
Wax part
Black
Blue
- 14. Multiple Choice
Good fuel is
Readily available
Cheap
Burn easily in air
All of these
- 15. Multiple Choice
Ideal fuel has ____________ calorific value
Zero
Low
Moderate
High
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