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WorksheetsCombustion And Flame
Total questions: 10
Worksheet time: 2mins
Define combustion.
A substance burn while leaving smoke in air.
A physical process in which a substance combines with oxygen to give off heat.
A chemical process in which a substance combines with oxygen to give off heat.
None of these.
Sun also produces heat and light, this process is called
(a)
How many layers of flame are there ?
One.
Two.
Three
Four.
Unlimited.
For combustion, which elements are required ?
Presence of combustible substance.
Presence of air (oxygen).
Reach of ignition temperature (heat).
None of these.
All of these.
Give any one advantage of using CNG and LPG.
They can be burnt directly.
They can be transported through pipe lines.
They are clean fuels, thus do not give off smoke.
All of these.
None of these.
A substance with very low ignition temperature will (a)
Coal burns with (a)
Which substance is a fire extinguisher ?
Oxygen.
Hydrogen.
Carbon doioxide.
Nitrogen.
Name the type of combustion, in which substances suddenly bursts into flames without any apparent applications.
(a)
Which is the hottest zone of a candle ?
Outer zone.
Middle zone.
Inner zone.
