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Class 8 Science
Combustion And Flame
Quiz 1
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The substances which have very low ignition temperature and can easily catch fire with a flame are called
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Inflammable substances
Explanation
Inflammable substances
In combustion
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Both heat and light is produced
Explanation
Both heat and light is produced
Explosion takes place because of
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Release of large amount of gas under pressure due to sudden reaction
Explanation
Release of large amount of gas under pressure due to sudden reaction
Which one of the following gases is used in combustion?
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Hydrogen
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Oxygen
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Nitrogen
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Carbon dioxide
Explanation
Oxygen
The burning of LPG is an example of
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rapid combustion
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spontaneous combustion
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slow combustion
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explosion
Explanation
rapid combustion
A temperature at which the substance burns is called
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melting
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boiling temperature
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kindling temperature
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evaporation
Explanation
kindling temperature
Which is non-renewable source of energy'?
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Natural gas
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Wind energy
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Tidal energy
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Mechanical energy
Explanation
Natural gas
Which of the following is not a fossil fuel?
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Coal
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Petroleum
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Natural gas
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Water gas
Explanation
Water gas
Which gas helps in the process of combustion?
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Cooking gas
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Nitrogen gas
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Oxygen gas
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Producer gas
Explanation
Oxygen gas
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called
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calorific value
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significant value
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heat value
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internal energy
Explanation
calorific value
Which zone represents the partial combustion in candle flame?
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Outer zone
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Middle zone
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Inner zone
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Lower zone
Explanation
Middle zone
Burning coal in a closed room will produce
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nitrogen oxides
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carbon dioxide
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carbon monoxide
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oxygen
Explanation
carbon monoxide
Substances which catch fire are called
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acids
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bases
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combustible
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burners
Explanation
combustible
Out of these, which is able to control fires?
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NH3
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H2
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CO2
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F2
Explanation
CO2
Which zone of a flame does a goldsmith use for melting gold and silver ?
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Outer zone
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Middle zone
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Inner zone
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Lower zone
Explanation
Outer zone
Calorific value of a fuel is expressed in
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kilojoule per kilogram
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kilojoule per gram
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joule per milligram
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kilojoule per milligram
Explanation
kilojoule per kilogram
Which is non-combustible substance?
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Wood
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Paper
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Iron nails
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Straw
Explanation
Iron nails
Acid rain contains mainly
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oxygen and nitrogen gas
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fluorine and chlorine gas
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magnesium oxide
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nitrogen oxide and sulphur dioxide
Explanation
nitrogen oxide and sulphur dioxide
The hottest zone of the flame is
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Innermost zone
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outermost zone
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Middle zone
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Can't Say
A chemical process in which a substance reacts with oxygen to give off heat is called _______
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combustion.
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Ignition
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Nuclear fission
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Burning
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