RBSE Class 6 Science Important Questions Chapter 15 Air Around Us

Rajasthan Board  RBSE Class 6 Science Important Questions Chapter 15 Air Around Us Important Questions and Answers.

RBSE Class 6 Science Chapter 15 Important Questions  Air Around Us

Multiple Choice Questions

Question 1. 
Which gas is essential for the survival of all living organisms?
(a) Nitrogen 
(b) Oxygen
(c) Hydrogen 
(d) Carbon dioxide
Answer:
(b) Oxygen

 

Question 2. 
Plants give out which gas during the process of photosynthesis?
(a) Oxygen 
(b) Carbon dioxide
(c) Nitrogen 
(d) Hydrogen
Answer:
(a) Oxygen 

Question 3. 
Which gas is used in breathing?
(a) Carbon dioxide 
(b) Oxygen
(c) Nitrogen 
(d) None of these
Answer:
(b) Oxygen

Question 4. 
Mountaineers carry oxygen cylinders with them because :
(a) There is no oxygen on high mountains.
(b) There is lack of oxygen on high mountains.
(c) Oxygen is used for cooking.
(d) Oxygen gives them warmth.
Answer:
(b) There is lack of oxygen on high mountains.

Question 5. 
The windmill is used to.
(a) generate electricity
(b) run flour mills
(c) draw water from tubewells
(d) all of these
Answer: 
(d) all of these

Fill in the Blanks

Question 1. 
............... is essential for life on Earth.
Answer:
Atmosphere

Question 2. 
Aquatic animals use dissolved air in water for ...............
Answer:
respiration

Question 3. 
The presence of  ...............  in air is important for the water cycle in nature.
Answer:
water vapour

Question 4. 
The burning of fuel produces ...............
Answer:
smoke

Question 5. 
The ............... is used to draw water from tubewells and to rim flour mills. 
Answer: 
windmill

State whether True or False

Question 1. 
Air is not present in water.
Answer:
False

Question 2. 
Air contains water vapours.
Answer:
True

Question 3. 
Plants lose water during photosyn¬thesis.
Answer:
False

Question 4. 
Plants do not respire.
Answer:
False

Question 5. 
Air is necessary for burning.
Answer:
True

 

Match the followings

Column I	Column II
1. Smoke	(a) 99% of air
2. Weather cock	(b) respiration
3. Oxygen and nitrogen	(c) oxygen cylinders
4. Oxygen	(d) the direction of moving air
5. Mountaineers	(e) gases, dust particles
6. Respiration	(f) a thin layer of air surrounding our Earth
7. Windmill	(g) allow air to move around
8. Open areas	(h) process of burning of food to get energy
9. Photosynthesis	(i) change wind energy into electrical energy
10. Atmosphere	(j) the process to prepare food with green plants

Answer:

Column I	Column II
1. Smoke	(e) gases, dust particles
2. Weather cock	(d) the direction of moving air
3. Oxygen and nitrogen	(a) 99% of air
4. Oxygen	(b) respiration
5. Mountaineers	(c) oxygen cylinders
6. Respiration	(h) process of burning of food to get energy
7. Windmill	(i) change wind energy into electrical energy
8. Open areas	(g) allow air to move around
9. Photosynthesis	(j) the process to prepare food with green plants
10. Atmosphere	(f) a thin layer of air surrounding our Earth

Very Short Answer Type Questions

Question 1. 
Define wind.
Answer: 
Moving air is called wind.

Question 2. 
What is a weather cock?
Answer: 
Weather cock shows the direction of moving air at a particular place.

Question 3
many uproot the trees and blow off the rooftops?
Answer: 
The high-speed wind or storms may uproot the trees and blow off the rooftops. 

Question 4. 
Which gases do not support burning?
Answer: 
Nitrogen and carbon dioxide do not support burning.

 

Question 5. 
Why do we feel suffocated in a closed room if something is burning there?
Answer: 
This is due to the production of carbon dioxide which is produced by burning. Its accumulation in a closed room causes suffocation.

Question 6. 
Which two gases make up major part of the air?
Answer: 
Nitrogen and oxygen together make up 99% of the air.

Short Answer Type Questions

Question 1. 
List the properties of air.
Answer: 

1. Air is present everywhere around us.
2. Air is colourless and transparent.
3. It occupies space.
4. It supports burning.
5. It is essential for the survival of living organisms.

Question 2. 
Define atmosphere.
Answer: 
The blanket of air that surrounds the Earth is known as atmosphere. This layer extends up to many kilometres above the surface of the Earth.

Question 3. 
Why do mountaineers carry oxygen cylinders with them while climbing high mountains?
Answer: 
Mountaineers carry oxygen cylinder while climbing high mountains because as we go up in the atmosphere, the level of oxygen goes on decreasing. Hence, to avoid suffocation they carry oxygen.

Question 4. 
What is the source of carbon dioxide in the air?
Answer: 
Plants and animals consume oxygen for respiration and produce carbon dioxide. Plants and animals matter on burning consume oxygen and produce carbon dioxide.

Question 5. 
Show the role of long chimneys in factories?
Answer: 
The burning of fuels in factories produces smoke. Smoke contains a few gases and fine dust particles which are often harmful to us. Hence, long chimneys take the harmful gases and smoke away from us.

Question 6. 
Do you see some tiny shining particles moving in the beam of sunlight? What are these particles? Answer: Yes, we see some tiny shining particles moving in the beam of sunlight. These are dust particles which are present in the air and we see them floating in the beam of light.

Question 7. 
Do you recall being scolded by your parents when you breathe through your mouth?
Answer:
Yes, our parents scolded us when we breathe through our mouth because if we do so, harmful dust particles may enter to our body through the mouth and cause snoring, gum disease, etc.

Question 8. 
What is a windmill? Mention its uses.
Answer: 
A windmill is a structure with long pieces of wood on the outside which turn around as the wind blows. Windmill is used to generate electricity, to pump water, run flour mills, etc.

Question 9. 
Make meaningful sentences using the given set of words :
(a) Air, wind, is motion, called, in.
(b) Space, air, occupies.
(c) Respiration, water, for, the air in, dissolved, use, aquatic, animals.
(d) On Earth, the atmosphere, essential, is, for life.
(e) 99%, Oxygen, nitrogen, air, together, and, form.
Answer:
(a) Air in motion is called wind.
(b) Air occupies space.
(c) Aquatic animals use dissolved air in water for respiration.
(d) Atmosphere is essential for life on Earth.
(e) Oxygen and nitrogen together form 99% of air.

Long Answer Type Questions

Question 1. 
Why do living things need air to survive?
Answer: 
Living things cannot survive without air. We breathe in oxygen and breathe out carbon dioxide. Plants use carbon dioxide to make their food through a process called photosynthesis. They release oxygen in the air in this process. Thus, air is important for all living things.

Question 2. 
How do the organisms that live in soil get the air for respiration?
Answer: 
The organisms which are living under the soil such as in the roots of a plant respire by taking oxygen present in the soil. Some organisms make deep burrows and holes in the soil through which the air reaches them for respiration. When it rains heavily and water fills up all the spaces occupied by the air in the soil, then these animals come out for respiration.

 

Question 3. 
Why air is essential to us?
Answer: 
Apart from breathing, air is essential in many ways such as :

1. Air helps the windmill to rotate and produce electricity to draw water from tube wells and to run flour mills.
2. Air helps birds and insects to fly.
3. Air helps in the dispersal of seeds and pollen grains.
4. Air helps in the movements of sailing yachts, gliders, parachutes and aeroplanes.
5. Air contains water vapour which is an essential part of water cycle.

Question 4. 
How does the balance of oxygen and carbon dioxide maintain in the atmosphere?
Answer: 
The balance of oxygen and carbon dioxide in the atmosphere is maintained through respiration in plants and animals and by the photosynthesis in plants. Animals take in oxygen and gives out carbon dioxide which is used by the plants in the process of photosynthesis. Plants produce more oxygen than they consume during transpiration.