Q1 of 32 Page 104

Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is

Oxygen is the gas that is necessary for the survival of human beings. The gases in Earth's atmosphere are:

Nitrogen — 78 percent.


Oxygen — 21 percent.


Argon — 0.93 percent.


Carbon dioxide — 0.04 percent.

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2

Which of the following is not a source of air pollution?

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Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school?

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Which of the following is not a way to conserve water?

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The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is