Question

What is a fuel? Give two examples each of solid, liquid, and gaseous fuels.

Answer 1

A fuel is a substance which produces heat and light on burning. Depending upon the state of existence at room temperature, fuels can be mainly classified into three types:
(i) Solid fuels : Examples include wood and coal.
(ii) Liquid fuels : Examples include kerosene and petrol.
(iii) Gaseous fuels : Examples include petroleum gas and natural gas.