Here we are providing Class 6 science Objective Chapter – 15 Air Around Us because its very important for Class 6 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 6 science Objective Chapter – 15 Air Around Us is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 6 science Objective Chapter – 15 Air Around Us 100+ questions so that students practice more and more. If you want class wise Notes Then Click Here
Class 6 Science Objective Chapter – 15 Air Around Us
1.What do plant and animal matter produce on burning ?
( A ) Carbon dioxide
( B ) Few other gases
( C ) Both ( A ) and (b)
( D ) None of these
Ans – ( C )
2.What are the properties of air?
( A ) It occupies space
( B ) It is present everywhere around us
( C ) It has no colour and is transparent
( D ) All of the above
Ans – ( D )
3. Mountaineers carry oxygen cylinders with them because
( A ) oxygen supports combustion.
( B ) oxygen is less at higher altitudes.
( C ) more oxygen is needed to cook food.
( D ) oxygen does not support combustion.
Ans – ( B )
4.What do plant animal matter consume on burning ?
( A ) Carbon dioxide
( B ) Oxygen
( C ) Nitrogen
( D ) None of these
Ans – ( B )
5.Moving air is called
( A ) dust
( B ) smoke
( C ) wind
( D ) nitrogen
Ans – ( C )
6. Which of the following plays a very important role in the oxygen cycle?
( A ) Birds
( B ) Animals
( C ) Plants
( D ) Soil
Ans – ( C )
7.contains few gases and fire dust particle.
( A ) Wind
( B ) Vapour
( C ) Atmosphere
( D ) Smoke
Ans – ( D )
8.Properties of oxygen gas is
( A ) colourless
( B ) tasteless
( C ) odourless
( D ) all of these
Ans – ( D )
9. The balance between carbon dioxide and oxygen is maintained by
( A ) Evaporation and photosynthesis
( B ) Transpiration and respiration
( C ) Photosynthesis and respiration
( D ) Hydrogenation and combustion
Ans – ( C )
10.The composition of nitrogen gas in the atmosphere is
( A ) 21%
( B ) 78%
( C ) 1%
( D ) 0.01%
Ans – ( B )
11.Mountaineers carry cylinders with them.
( A ) Carbon dioxide
( B ) Nitrogen
( C ) Water
( D ) Oxygen
Ans – ( D )
12.Oxygen is a supporter of
( A ) combustion
( B ) nitrogen
( C ) smoke
( D ) dust
Ans – ( A )
13. The layer of air around the earth surface is called
( A ) Hydrosphere
( B ) Lithosphere
( C ) Atmosphere
( D ) Stratosphere
Ans – ( C )
14.The properties of air are:
( A ) It has no colour
( B ) It occupies space
( C ) It is transparent
( D ) All of these
Ans – ( D )
15.The two gases which together make up about 99 per cent of the air are
( A ) nitrogen and carbon dioxide
( B ) nitrogen and ozone
( C ) nitrogen and oxygen
( D ) carbon dioxide and oxygen
Ans – ( C )
16. The active part of air is
( A ) Carbon dioxide
( B ) Oxygen
( C ) Rare gases
( D ) Carbon monoxide
Ans – ( B )
17.When the bottle was tilted, the air was able to come out in the form of.
( A ) Gas
( B ) Smoke
( C ) Vapour
( D ) Bubbles
Ans – ( D )
18.Air is considered to be
( A ) a compound
( B ) a mixture
( C ) an element
( D ) a solvent
Ans – ( B )
19. The components of air which are harmful to living beings are
( A ) Nitrogen and carbon dioxide
( B ) Dust and water vapour
( C ) Smoke and water vapour
( D ) Dust and smoke
Ans – ( D )
20.What is the percentage of nitrogen and oxygen in air ?
( A ) 98%
( B ) 99%
( C ) 97%
( D ) 100%
Ans – ( B )
21.Wind does not help in the movement of
( A ) firki
( B ) weather cock
( C ) ceiling fan
( D ) sailing yacht
Ans – ( C )
22. Which of the following processes need oxygen?
( A ) Combustion
( B ) Respiration
( C ) Oxidation
( D ) All of the above
Ans – ( D )
23.What is percentage of carbon dioxide and few other gases, water vapour, dust particles ?
( A ) 2%
( B ) 1%
( C ) 3%
( D ) None of these
Ans – ( B )
24.Mountaineers carry oxygen cylinder 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 )
25. Atmospheric pressure _____________ with height.
( A ) Increase
( B ) Decrease
( C ) Depends upon season
( D ) Remain same
Ans – ( B )
26.Which component of air is used by green plants to make their food ?
( A ) Oxygen
( B ) Nitrogen
( C ) Carbon dioxide
( D ) None of these
Ans – ( C )
27.Air is present in
( A ) atmosphere
( B ) soil
( C ) water
( D ) everywhere
Ans – ( D )
28. Finer hair inside the nose
( A ) Filter the microbes
( B ) Prevent the water vapour
( C ) Prevent the carbon dioxide gas
( D ) Filter the dust particle
Ans – ( C )
29.Which gas in the atmosphere is essential for respiration ?
( A ) Oxygen
( B ) Nitrogen
( C ) Carbon dioxide
( D ) None of these
Ans – ( A )
30.Which of the following gas is used for breathing?
( A ) Carbon dioxide
( B ) Nitrogen
( C ) Oxygen
( D ) None of these
Ans – ( C )
31. The presence of air around can be proved by
( A ) Seeing it
( B ) Feeling it when moves
( C ) Smelling it
( D ) Its colour
Ans – ( B )
32..The envelope of air that surrounds the earth is known as:
( A ) Air
( B ) Wind
( C ) Atmosphere
( D ) None of these
Ans – ( C )
33.Which components of air are harmful to living organisms?
( A ) Nitrogen and oxygen
( B ) Dust and smoke
( C ) Oxygen and carbon dioxide
( D ) Smoke and water vapour
Ans – ( B )
34. Density of air ____________ with height.
( A ) Increase
( B ) Remain same
( C ) Decrease
( D ) First increase than decrease
Ans – ( C )
35.Air in motion is called:
( A ) Air
( B ) Wind
( C ) Atmosphere
( D ) None of these
Ans – ( B )
36.Which of the following gases is not found in the atmosphere?
( A ) Oxygen
( B ) Hydrogen
( C ) Nitrogen
( D ) Carbon dioxide
Ans – ( B )
38. Major part of the air is constituted by
( A ) Nitrogen correct
( B ) oxygen
( C ) carbon dioxide
( D ) inert gases
Ans – ( B )
39. Which of the following is combustible?
( A ) Oxygen
( B ) Carbon dioxide
( C ) Hydrogen
( D ) All of these
Ans – ( C )
40.Nitrogen, oxygen, carbon dioxide, water vapour and a few gases are:
( A ) Wind
( B ) Components of air
( C ) Atmosphere
( D ) None of these
Ans – ( B )
41. Which of the following gas helps in burning?
( A ) Nitrogen
( B ) Oxygen correct
( C ) Carbon dioxide
( D ) Carbon monoxide
Ans – ( B )
42.The ratio of nitrogen to oxygen in the air is
( A ) 1:4
( B ) 4:1
( C ) 3:1
( D ) 1:2
Ans – ( B )
43.What makes a firki rotate ?
( A ) Atmosphere
( B ) Moving air
( C ) Water vapour
( D ) None of these
Ans – ( B )
44. The percentage of nitrogen in air is
( A ) 21%
( B ) 0.1%
( C ) 54%
( D ) 78%
Ans – ( D )
45.During storms the wind blows at a very.
( A ) Medium speed
( B ) High speed
( C ) Low speed
( D ) None of these
Ans – ( B )
46. The nitrogen content in air is
( A ) 88%
( B ) 21%
( C ) 78%
( D ) 68%
Ans – ( C )
47.Burning occurs in the presence of which gas ?
( A ) Oxygen
( B ) Nitrogen
( C ) Carbon dioxide
( D ) Water vapour
Ans – ( A )
48. A gas used for welding purpose is
( A ) Neon
( B ) Nitrogen
( C ) Carbon dioxide
( D ) None of these
Ans – ( C )
49.Why do plants and animals consume oxygen ?
( A ) Transpiration
( B ) Evaporation
( C ) Respiration
( D ) Condensation
Ans – ( C )
50. Which of the following gas is found in largest quantity in air?
( A ) Nitrogen
( B ) Carbon dioxide
( C ) Argon
( D ) Oxygen
Ans – ( A )
51.The burning of fuel also produces
( A ) Air
( B ) Fire
( C ) Smoke
( D ) None of these
Ans – ( C )
52. When we heat water, we find bubbles coming from it. This shows that
( A ) water contains air.
( B ) air contains water.
( C ) water itself converts into bubbles.
( D ) water contains dissolved minerals.
Ans – ( A )
53.Why do we feel suffocation if some material is burning in a closed room ?
( A ) Due to excess of carbon-dioxide
( B ) Due to excess of oxygen
( C ) Due to excess of water vapour
( D ) Due to excess of nitrogen
Ans – ( A )
54. Mountaineers carry oxygen ______________ with them, while climbing mountains.
( A ) Filer
( B ) Cylinder
( C ) Mask
( D ) Bag
Ans – ( B )