Q11 of 25 Page 106

In a few years the fuels on earth will be exhausted. Think, what would happen to human civilization?

When fuels on earth will be exhausted, it will be a huge loss to human civilization. But also inexhaustible biofuels and alternate (non-conventional) sources of energy would be available to fulfill our basic energy requirements. So we need to develop ways to extract maximum energy out of alternate sources and need to maximize the use of biofuels such as biodiesel, biogas, hydrogen gas etc.


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9

It is difficult to burn a heap of green leaves but not a heap of dry leaves. Explain why?

 10

Give supporting arguments for both the statements (1) fire is useful (2) fire is harmful

 12

What would happen if oxygen stops to support combustion? – Make a guess. And if it is the situation for what other works fuels are useful.

 13

Use of more fuels in our daily life causes air pollution and it is harmful to human being and the other life on earth. Suggest some remedies to avoid this.