Q1 of 13 Page 75

List conditions under which combustion can take place.

The conditions required for combustion to take place are:

1) The presence of oxygen.

2) Presence of an inflammable substance (to catch fire)

3) Ignition temperature.

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2

Fill in the blanks:

(a) Burning of wood and coal causes _________of air.


(b) A liquid fuel used in homes is _____________.


(c) Fuel must be heated to its __________ before it starts burning.


(d) Fire produced by oil cannot be controlled by ____________.

 3

Explain how the use of CNG in automobiles has reduced pollution in our cities.

 4

Compare LPG and wood as fuels.

 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.