Why do mountaineers carry oxygen with them?

There is no air above 5 km.

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The pressure of air is higher than that on ground.

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The temperature of air is higher than that on ground.

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The amount of air available on mountains is less.

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Solution

The correct option is D
The amount of air available on mountains is less.

As height increases the atmospheric pressure decreases. Therefore, when we move up in altitude, the amount of oxygen available for breathing decreases and so the mountaineers face difficulty in breathing. Hence they need to carry oxygen cylinders to ensure a sufficient oxygen supply.

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Similar questions

The mountaineers carry oxygen with them because:

(a) At an altitude of more than 5 km there is no air.

(b) The amount of air available to a person is less than that available on the ground.

(d) The pressure of air is higher than that on the ground.

Statement I: Mountaineers carry oxygen cylinders with them when they climb high mountains.

Statement II: Layer of air gets thinner at higher altitudes and breathing becomes difficult.

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