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Multiple Choice Questions

Consider the following statements with regard to atmospheric gases 1 Carbon dioxide i...........

Geography and Environment (HAS) World climates

Consider the following statements with regard to atmospheric gases :

1. Carbon dioxide is opaque to the incoming solar radiation but transparent to the outgoing terrestrial radiation which makes it meteorologically important gas.

2. Water vapour is a variable gas in the atmosphere which increases with altitude.

Which of the statements given above is/are correct?

1 only

2 only

Both 1 and 2

Neither 1 nor 2

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Explanation:

First statement is incorrect as carbon dioxide is meteorologically a very important gas as it is transparent to the incoming solar radiation but opaque to the outgoing terrestrial radiation. It absorbs a part of terrestrial radiation and reflects back some part of it towards the earth’s surface. It is largely responsible for the greenhouse effect.

Second statement is incorrect as water vapour is a variable gas in the atmosphere, which decreases with altitude. Water vapour also decreases from the equator towards the poles.

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