Q2 of 20 Page 89

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

Wind help in the movement of firki, weather cock and sailing yacht but it does not play any role in the movement of ceiling fan. Fan rotate with the help of electricity.

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1

Which of the following statements is incorrect?

 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?