Question

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

Answer 1

B     The amount of air available to a person is less than that , on ground

Answer 2

"The correct answer is:

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

As the air decreases with increasing altitude, there will be a scarcity of oxygen which is essential for breathing.

Thus, mountaineers carry oxygen cylinders with them to replenish the scarcity of oxygen when they go to higher altitudes.

"