Q5 of 33 Page 459

Write two advantages of classifying energy sources as renewable and non-renewable.

By classifying sources of energy as renewable and non-renewable :

• we can have a knowledge of how many sources are left and the proper ways they can be used so that we can pass them to our future generations.


• we can look for different alternates of the fast depleting non-renewable resources of energy.


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(a) Classify the two fuels – CNG and hydrogen – as renewable and non-renewable.

(b) Justify the statement, “Hydrogen is a cleaner and better fuel than CNG”.

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What is the importance of hydropower plants in India? Describe how electric energy is generated in such plants.