The substances which have very low ignition temperature and can easily catch fire with a flame are called
  • Inflammable substances
In combustion
  • Both heat and light is produced
Explosion takes place because of
  • Release of large amount of gas under pressure due to sudden reaction
Which one of the following gases is used in combustion?
  • Hydrogen
  • Oxygen
  • Nitrogen
  • Carbon dioxide
The burning of LPG is an example of
  • rapid combustion
  • spontaneous combustion
  • slow combustion
  • explosion
A temperature at which the substance burns is called
  • melting
  • boiling temperature
  • kindling temperature
  • evaporation
Which is non-renewable source of energy'?
  • Natural gas
  • Wind energy
  • Tidal energy
  • Mechanical energy
Which of the following is not a fossil fuel?
  • Coal
  • Petroleum
  • Natural gas
  • Water gas
Which gas helps in the process of combustion?
  • Cooking gas
  • Nitrogen gas
  • Oxygen gas
  • Producer gas
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called
  • calorific value
  • significant value
  • heat value
  • internal energy
Which zone represents the partial combustion in candle flame?
  • Outer zone
  • Middle zone
  • Inner zone
  • Lower zone
Burning coal in a closed room will produce
  • nitrogen oxides
  • carbon dioxide
  • carbon monoxide
  • oxygen
Substances which catch fire are called
  • acids
  • bases
  • combustible
  • burners
Out of these, which is able to control fires?
  • NH3
  • H2
  • CO2
  • F2
Which zone of a flame does a goldsmith use for melting gold and silver ?
  • Outer zone
  • Middle zone
  • Inner zone
  • Lower zone
Calorific value of a fuel is expressed in
  • kilojoule per kilogram
  • kilojoule per gram
  • joule per milligram
  • kilojoule per milligram
Which is non-combustible substance?
  • Wood
  • Paper
  • Iron nails
  • Straw
Acid rain contains mainly
  • oxygen and nitrogen gas
  • fluorine and chlorine gas
  • magnesium oxide
  • nitrogen oxide and sulphur dioxide
The hottest zone of the flame is
  • Innermost zone
  • outermost zone
  • Middle zone
  • Can't Say
A chemical process in which a substance reacts with oxygen to give off heat is called _______
  • combustion.
  • Ignition
  • Nuclear fission
  • Burning
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