Q2 of 13 Page 155

Explain.

Fossil fuels are to be used judiciously

Fossil fuels should be used judiciously because they are exhaustible and are present in limited amount in nature. Also the formation of fossil fuels takes millions of years. When the fossil fuels are burnt it causes pollution. The fossil fuels are not present evenly on the earth. Hence the availability of fossil fuels is also less. Therefore, they should be used judiciously.


More from this chapter

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1

Classify the following sources of energy as renewable and nonrenewable. Which among them are sources of green energy? Write them down

•Petroleum •coal • wind


• ocean • wave • hydroelectric power


• solar energy.

 2

Explain.

Hydrogen is not used as a household fuel though it is of very high calorific value.

 2

Explain.

As far as possible avoid burning of biomass

 3

Establish that encouraging the use of green energy is a need of the time.