Tag: constituents of air

Questions Related to constituents of air

What process replenishes the atmosphere with oxygen?

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. Oxygen Cycle

  2. Water Cycle

  3. Photosynthesis

  4. Both $A$ and $C$

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Correct Option: C
Explanation:

During the process of photosynthesis, the hydrogen is combined with carbon atoms to produce oxygen which is then released into the atmosphere.


Hence the option C is correct.

Oxygen is not a constituent of:

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. urea

  2. cloth

  3. graphite

  4. book

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Correct Option: C
Explanation:

Oxygen is not present in graphite. It is am allotrope of carbon. 

Animals cannot live without :

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. plants

  2. air

  3. oxygen

  4. only A and B

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Correct Option: A,B,C
Explanation:

Plant is necessary for animals for food and shelter,air is important for atmosphere and oxygen is important for breathing.

Plants consumes ____________ and gives _____________.

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. oxygen, carbon dioxide

  2. carbon dioxide, oxygen

  3. sulphur dioxide, oxygen

  4. oxygen, sulphur dioxide

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Correct Option: B
Explanation:

Plants consumes carbon dioxide and gives oxygen.

As in the process of photosynthesis plants consumes carbon dioxide and during photosynthesis plants release oxygen.

How is the percentage of oxygen in an atmosphere maintained?

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. consumption of carbon dioxide by plants

  2. consumption of oxygen by living beings

  3. consumption of oxygen by plants

  4. consumption of carbon dioxide by animals

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Correct Option: A,B
Explanation:

The percentage of oxygen in an atmosphere is maintained by consumption of carbon dioxide by plants and consumption of oxygen by living beings.


Hence the options A and B are correct.

_________ form of water is present in oceans, lakes, rivers and even underground.

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. Liquid 

  2. The gaseous

  3. The solid form

  4. None of the above

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Correct Option: A
Explanation:

Water can be found in liquid form in oceans, rivers, lakes and rain; in solid form in ice and snow; and as a gas (water vapour) in the atmosphere.

Snow and ice, are present as ________ at the poles of the earth, snow-covered mountains, and glaciers.

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. liquid form

  2. the solid form

  3. the gaseous form

  4. none of the above

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Correct Option: B
Explanation:

Water can be found in liquid form in oceans, rivers, lakes and rain; in solid form in ice and snow; and as a gas (water vapour) in the atmosphere.


Hence, option B is correct.

_______ of the earth's surface is covered with water.

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. 71%

  2. 72%

  3. 73%

  4. 74%

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Correct Option: A
Explanation:

$71\%$ of the earth's surface is covered with water. Hence, earth is also known as the Blue Planet.

Which of the following is potable water?

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. A glass of water fit for drinking

  2. Water in a pot

  3. Sea water

  4. Water with bacteria and chemicals

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Correct Option: A
Explanation:

A glass of water is fit for drinking. Water in a pot may contain impurities like dust, sand, etc. Sea contains huge number of impurities including huge levels of salts and water with bacteria and chemicals and is not preferred for drinking. 

How much of the Earth's surface is covered with water?

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. About two-third

  2. About one-fourth

  3. About three-fourth

  4. About one-third

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Correct Option: C
Explanation:

About three-fourth of the Earth's surface is covered with water, i.e., about $71\%$ of the earth's surface has water in it.