Q4 of 20 Page 89

Mountaineers carry oxygen cylinders with them because

When we go higher and higher the oxygen and pressure decreases. At higher altitude the amount of oxygen decreases and it become difficult to breath so the mountaineers carry oxygen cylinders with them.

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2

Wind does not help in the movement of which of the following?

 3

What is not true about air?

 5

Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.

(i) Bubbles of air came out from the bottle.


(ii) Some water entered the bottle.


(iii) Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water.


(iv) No bubbles formed, only water entered the bottle. Which observations is/are correct?

 6

Which of the following components of air is present in the largest amount in the atmosphere?