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- 1. Multiple Choice
which one of the following gases is used in combustion?
Hydrogen
Oxygen
Carbon-dioxide
Nitrogen
- 2. Multiple Choice
The minimum temperature at which a material ignites is called
ignition Temperature
burning point
highest temperature
melting point
- 3. Multiple Choice
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called
heat value
internal value
significant value
calorific value
- 4. Multiple Choice
which zone represents the partial combustion in candle flame?
inner zone
lower zone
middle zone
outer zone
- 5. Multiple Choice
Substances which catch fire are called
burners
combustible
bases
non of these
- 6. Multiple Choice
Which is the hottest part of a flame
lower
inner
middle
outer
- 7. Multiple Choice
Which zone of a flame does a goldsmith use for melting gold and silver?
top part
outer part
middle part
inner part
- 8. Multiple Choice
choose any two combustible substances
wood
glass
stone
charcoal
- 9. Multiple Choice
in what type of matter can a fuel exist
solid
liquid
gas
all three
- 10. Multiple Choice
Is water combustible?
Yes
No
- 11. Multiple Choice
What are the three essential requirements for combustion?
Fuel
Oxygen
Heat
Light
- 12. Multiple Choice
__________of fuel forms poisonous carbon monoxide gas.
Incomplete combustion
complete combustion
heating
cooling
- 13. Multiple Choice
combustion gives__________
heat
light
oxygen
none of these
- 14. Multiple Choice
Burning of charcoal in a closed room will produce
Carbon monoxide
Hydrogen
Nitrogen dioxide
Methene
- 15. Multiple Choice
Combustion is a ____________
Physical process
Chemical process
Both of these processes
None of these
- 16. Multiple Choice
The substance which have very low ignition temperature will
Catch fire easily
Will not catch fire
Catch fire after sometime
None of these
- 17. Multiple Choice
Calorific value is measured in
Kilo joules
Kilo grams
Kilo joules per kg
Kilo metre
- 18. Multiple Choice
Unburnt carbon particles causes
Stomach infection
Respiratory problems
Brain infections
Throat problems
- 19. Multiple Choice
Global warming is caused due to ___________ concentration of CO2 in air
Decreased
Increased
purified
None of these
- 20. Multiple Choice
Which chemical is used in the rubbing surface provided for matchsticks?
Red Phosphorus
White Phosphorus
copper
sulphur
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