Q7 of 13 Page 75

Name the unit in which the calorific value of a fuel is expressed.

The calorific value of a fuel is expressed in kilojoules per kilogram (kJ/kg).


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5

Give reasons.

(a) Water is not used to control fires involving electrical equipment.


(b) LPG is a better domestic fuel than wood.


(c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

 6

Make a labeled diagram of a candle flame.

 8

Explain how CO2is able to control fires.

 9

It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.