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- 1. Multiple Choice
Which substance give heat and light after combustion
Flame
Fuel
Combustion
None of these
- 2. Multiple Choice
Burning of charcoal in a closed room will produce
Carbon dioxide
Nitrogen dioxide
Carbon monoxide
Sulphur dioxide
- 3. 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
- 4. Multiple Choice
Ignition temperature is
Lowest temperature at catch fire
Higher temperature at catch fire
Any temperature
1000 C
- 5. Multiple Choice
Combustion is a
Natural process
Chemical process
Physical process
None of these processes
- 6. Multiple Choice
Which one of the following is combustible?
Iron nail
Glass
Stone pieces
Paper
- 7. Multiple Choice
Fire extinguisher-
Raise up temperature of fuel
Bring down the temperature of fuel
Cut off the supply of air
None of these
- 8. Multiple Choice
Good fuel is
Readily available
Cheap
Burn easily in air
All of these
- 9. Multiple Choice
Ideal fuel has ____________ calorific value
Zero
Low
Moderate
High
- 10. Multiple Choice
Combustion is a reaction in which a substance reacts with
hydrogen
Nitrogen
Oxygen
Chlorine
- 11. Multiple Choice
What is the main chemical component present in striking surface of a matchbox?
Potassium chlorate
Phosphorus
Potassium
Graphite
- 12. Multiple Choice
An ideal fuel is cheap, readily available, easily combustible and easy to transport. It has high calorific value. It does not produce gases or residues that pollute the environment. Based on the above statements which of the following is closest to being an ideal fuel?
Compressed Natural Gas (CNG)
Kerosene
Petrol
Coal
- 13. Multiple Choice
When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. Identify the type of combustion?
Explosion
Random combustion
Rapid combustion
Spontaneous combustion
- 14. Multiple Choice
The least hot zone of a candle flame is
non-lumious zone
luminous
dark zone
blue zone at the base of the wick
- 15. Multiple ChoiceWhich type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?WaterCarbon DioxideDry ChemicalFoam
- 16. Multiple ChoiceWater is not used to control fires involving electrical appliances.FalseTrue
- 17. Multiple ChoiceThe products of combustion of a hydrocarbon are:hydrogen + oxygencarbon dioxide + watercarbon dioxide + hydrogencarbon + water
- 18. Multiple Choicewhat is the type of combustion
which occurs rapidly and produce heat and light?rapid combustionspontaneous combustionfast combustionexplosion - 19. Multiple Choice
Fire is extinguished by
removing all combustible substance
cutting off supply of air
cooling the burning substance
all the these
- 20. Multiple Choice
matchstick catch fire?
By rubbing a matchstick against a rough surface
By attaining the ignition temperature
None of the above
all of the above
- 21. Multiple Choice
Burning of LPG is an example of
Spontaneous
Rapid
Explosion
None
- 22. Multiple Choice
ignition temperature is
any temperature at which a substance catches fire
highest temperature at which a substances catches fire
lowest temperature at which a substance catches fire
- 23. Multiple Choice
Calorific value is measured in
Kilo joules
Kilo grams
Kilo joules per kg
Kilo metre
- 24. Multiple Choice
Unburnt carbon particles causes
Stomach infection
Respiratory problems
Brain infections
Throat problems
- Answer choicesTagsAnswer choicesTags