The substances which have very low ignition temperature will

• catch fire easily

• will not catch fire

• catch fire after some time

• none of the above

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

Fire produced by oil cannot be controlled by ___________ .

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

Compare LPG and wood as fuels.

Give reasons :

Water is not used to control the fire involving electrical equipment.

Give reasons :

LPG is a better domestic fuel than wood.

Give reasons :

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

Make a labelled diagram of candle flame.

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

Explain how CO₂ is able to control fires.