Air Around Us
Multiple Choice Questions
1. Which of the following statements is incorrect?
(a) All living things require air to breathe.
(b) We can feel air but we cannot see it.
(c) Moving air makes it possible to fly a kite.
(d) Air is present everywhere but not in soil.
2. Wind does not help in the movement of which of the
following?
(a) Firki
(b) Weather cock
(c) Ceiling fan
(d) Sailing yacht
3. What is not true about air?
(a) It makes the windmill rotate.
(b) It helps in the movements of aeroplanes.
(c) Birds can fly due to presence of air.
(d) It has no role in water cycle.
4. 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?
(a) (i) and (ii)
(b) (iv) only
(c) (iii) and (iv)
(d) (i) only
5. Mountaineers carry oxygen cylinders with them because
(a) there is no oxygen on high mountains.
(b) there is deficiency of oxygen on mountains at high
altitude.
(c) oxygen is used for cooking.
(d) oxygen keeps them warm at low temperature.
Ans (b)
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Science