Q1 of 20 Page 89

Which of the following statements is incorrect?

Air is present everywhere. The organisms which live in the soil need oxygen(air) to breath so between the soil particles some amount of air is present.

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2

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

 3

What is not true about air?

 4

Mountaineers carry oxygen cylinders with them because

 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?