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- 1. Multiple Choice
Combustion is a reaction in which a substance reacts with
hydrogen
Nitrogen
Oxygen
Chlorine
- 2. Multiple Choice
Ideal fuel has ____________ calorific value
Zero
Low
Moderate
High
- 3. Multiple Choicewhat is the type of combustion
which occurs rapidly and produce heat and light?rapid combustionspontaneous combustionfast combustionexplosion - 4. 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
- 5. Multiple Choice
Fire is extinguished by
removing all combustible substance
cutting off supply of air
cooling the burning substance
all the these
- 6. Multiple Choice
Moderately hot zone in a candle flame
outer zone
middle zone
innermost zone
wax candle
- 7. Multiple Choice
What substance turns into gas and burns?
wax vapor
wick
solid wax
hydrogen in the air
- 8. Multiple ChoiceThe products of combustion of a hydrocarbon are:hydrogen + oxygencarbon dioxide + watercarbon dioxide + hydrogencarbon + water
- 9. Multiple ChoiceWhich of the following fuel has highest calorific value?WoodcoalHydrogenpetrol
- 10. Multiple ChoiceWater is not used to control fires involving electrical appliances.FalseTrue
- 11. Multiple ChoiceWhich type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?WaterCarbon DioxideDry ChemicalFoam
- 12. 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
- 13. Multiple Choice
Good fuel is
Readily available
Cheap
Burn easily in air
All of these
- 14. Multiple Choice
Which is the hottest part in the flame of the candle
Yellow
Wax part
Black
Blue
- 15. Multiple Choice
Which of the following is inflammable Substances?
Petrol
Wood
Paper
Straw
- 16. 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
- 17. 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
- 18. Multiple Choice
What is the main chemical component present in striking surface of a matchbox?
Potassium chlorate
Phosphorus
Potassium
Graphite
- 19. Multiple Choice
The substance which have very low ignition temperature will
Catch fire easily
Will not catch fire
Catch fire after some time
None of these
- 20. Multiple Choice
like fuel the sun also provides heat and light. the process taking place in the sun is called
Combustion
Nuclear Reaction
Burning
None of these
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