Worksheet : Combustion & flame Class 8 Notes | EduRev

Class 8 : Worksheet : Combustion & flame Class 8 Notes | EduRev

 Page 1


53
L-6
Combustion and Flame
Q.1 Label the various zones of candle flame and answer following questions
i) The hottest part of the flame _________________.
ii) Unburnt wax - vapours are found in which part of the flame ____________.
Q.2
by observing the above two figures, explain why candle extinguishes in case (A)
and is still burning in case (B)
.............................................................................................................................
.............................................................................................................................
3. Match the suitable and appropriate equipment you will use to control fire in dif-
ferent cases.
a) Short Circuit b) Water
c) A man caught with fire d) Blanket
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Page 2


53
L-6
Combustion and Flame
Q.1 Label the various zones of candle flame and answer following questions
i) The hottest part of the flame _________________.
ii) Unburnt wax - vapours are found in which part of the flame ____________.
Q.2
by observing the above two figures, explain why candle extinguishes in case (A)
and is still burning in case (B)
.............................................................................................................................
.............................................................................................................................
3. Match the suitable and appropriate equipment you will use to control fire in dif-
ferent cases.
a) Short Circuit b) Water
c) A man caught with fire d) Blanket
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54
4. The gas helpful in combustion is
a) Oxygen b) Carbondioxide
c) Nitrogen d) Hydrogen
5. combustion, which produces both heat and light :
a) Spontaneons combustion b) Explosion
c) Rapid Combustion d) None of these
6. The fuel with highest calorific value is :
a) L.P.G. b) Petrol
c) kerosene Oil d) Hydrogen
7. Of the following inflammable substance is :
a) Petrol b) Coal piece
c) Wood d) All of these
8. Cleaner fuel is :
a) Diesel b) Petrol
c) C.N.G. d) L.P.G.
9. Write one word for the following :
i) The lowest temperature at which a substance catches fire.___________
ii) Oxides of sulphur and nitrogen are dissolved in rain water, such rain is
Called _____________.
iii) The amount of heat energy produced on complete combustion of 1 kg. of
a fuel _____________.
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