# Ncert exemplar Solutions Class 6 Science Air Around Us

## Ncert exemplar Solutions Class 6 Science Air Around Us

Welcome to NCTB Solutions. Here with this post we are going to help 6th class students for the Solutions of NCERT Exemplar Class 6 Science Book, Chapter 15, Air Around Us. Here students can easily find step by step solutions of all the problems for Air Around Us, Also here our Science teacher’s are solved all the questions with easily understandable language with proper guidance so that all the students can understand easily.

Air Around Us all Questions Solution :

Multiple Choice Questions :

Question no – (1)

Which of the following statements is incorrect?

The correct answer is option – (d)

The incorrect statement is – Air is present everywhere but not in soil.

Question no – (2)

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

The correct answer is option – (c)

Wind does not help in the movement of Ceiling fan.

Question no – (3)

What is not true about air?

It has no role in water cycle is not true about air.

Question no – (4)

Mountaineers carry oxygen cylinders with them because

The correct answer is alternative – (b)

Mountaineers carry oxygen cylinders with them because there is deficiency of oxygen on mountains at high altitude.

Question no – (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.

The correct option is – (a) (i) and (ii)

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

(ii) Some water entered the bottle.

Question no – (6)

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

The correct answer is alternative – (a) Nitrogen

Nitrogen is the largest amount in the atmosphere.

Question no – (7)

The components of air which are harmful to living beings are

The answer is alternative – (c)

The components of air which are harmful to living beings are dust and smoke.

Question no – (8)

Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain

The appropriate option is – (c)

The bubbles contain air.

Question no – (9)

(a) Plants consume oxygen for respiration

This statement is True.

(b) Plants produce oxygen during the process of making their own food

This statement is True.

(c) Air helps in the movements of sailing yachts and glider but plays no role in the flight of birds and Aero planes

This statement is False.

Because, Air helps in the movement of sailing yachts and glider and plays role in the flight of birds and aeroplane.

(d) Air does not occupy any space

This statement is False.

Because, Air occupies space.

Question no – (10)

Air plays an important role in musical instruments like flute, mouth organ, saxophone etc.

Question no – (11)

(a) DILLMWIN Windmill.

(b) YNOGXE Oxygen.

(c) MESKO Smoke .

(d) TUDS Dust.

Question no – (12)

(a) 99%, oxygen, nitrogen, air, together

= Nitrogen and Oxygen together makes up to 99% of the air.

(b) Respiration, dissolved, animals, air, aquatic

= Dissolved air helps aquatic animals in respiration.

(c) Air, wind, motion, called

= Air in motion is called as wind.

Question no – (13)

(a) The Wind makes the windmill rotate.

(b) Air is a Mixture of some gases.

(c) A weather cock shows the Direction in which the air is moving at that place.

(d) Mountaineers carry oxygen Cylinders with them, while climbing high mountains.

Question no – (14)

(a) What is covering the nose and mouth of the police man?

= The nose and the mouth of the police officer is covered by a mask.

(b) Why is he putting a cover on his nose?

= He has put a cover so to protect himself from dust, smoke and polluted air.

(c) Can you comment on air quality of the place shown in the Fig.15.1?

= The air quality of the shown place is not good at all because of the smoke emitted by the vehicles on road.

Question no – (15)

Tiny bubbles forms in the bottle because due to the intense heat the dissolved gases in the bottle try escaping which results in the formation of small bubbles.

Question no – (16)

(a) (iv) Direction of air flow.

(b) (iii) Oxygen cylinders.

(c) (v) Prevent dust particles.

(d) (i) Gases and fine dust particles.

(e)  (ii) Sailing yacht.

Question no – (17)

A firki does not rotates in a closed area due to the lack of moving air.

Question no – (18)

(a) Oxygen :

= If oxygen disappears then the earth would lose all its living creatures as living organisms depend on oxygen to breathe.

(b) Nitrogen :

= If nitrogen disappears from atmosphere then things will catch fire far more easily with the absence of nitrogen.

(c) Carbon Dioxide :

= If carbon dioxide disappears then plant would not be able to make their own food as carbon dioxide is important for photosynthesis.

Question no – (19)

(a) Why did the tiny bubbles appeared?

= The tiny bubbles appeared because it has gases dissolved in it so when the water was boiled the gases escaped in the form of bubbles.

(b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.

= No, the water taken out from the bottle will not show bubbles when boiled because it does not have any gases dissolved in it.

Question no – (20)