Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.

5

(a)

Manu was heating oil to fry potato chips. The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. Do you think, this action was suitable? If yes, why? If not, why not? In such a condition what should Manu have done?

5

(a)

'Charcoal is a better fuel than wood'. Explain.

5

(a)

Give two examples each for a solid, liquid and gaseous fuel along with some important uses.

5

(a)

How can you burn wood or coal using kerosene oil?

5

(a)

Forest fire produces a lot of air pollution. Write in brief about the reasons of forest fires.

5

(a)

What are the three essential requirements to produce fire? How fire extinguisher is useful for controlling the fire?

5

(a)

Explain the harmful effects of burning fuels.

5

(a)