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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 grow
both flame and glow
none of these
- 3. Multiple Choice
like fuel the sun also provides heat and light. the process of taking place in the sun is called?
combustion
nuclear process
burning
all of these
- 4. Multiple Choice
which of these is not required for combustion ?
oxygen
combustible substance
carbon dioxide
ignition temperature
- 5. Multiple Choice
which of these shows spontaneous combustion ?
CNG
LPG
Diesel
Sodium
- 6. Multiple Choice
which of these shows slow combustion ?
firewood
petrol
kerosene
LPG
- 7. Multiple Choice
which of these gases is evolved on incomplete combustion of a fuel ?
sulphur dioxide
nitrogen oxide
carbon monoxide
hydrogen
- 8. Multiple Choice
what is the colour of the innermost zone of the flame ?
dark black
blue
yellow
red
- 9. Multiple Choice
CNG & LPG are the examples of
solid fuels
gaseous fuels
liquid fuels
they are not fuels
- 10. Multiple Choice
how many zones of flame are there ?
two
three
four
no zones are there
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