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Air Around Us

Description: Air Around Us
Number of Questions: 15
Created by:
Tags: Science Oxygen as a Component of Biotic and Abiotic World Air Pollution Coal - its Discovery and its Products Limited Life of Certain Natural Resources Petroleum and the Process of Refining
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_____________ is not ideally a constituent of air.

  1. Oxygen

  2. Nitrogen

  3. Carbon monoxide

  4. Water vapour

  5. Carbon dioxide

Show answer
Correct Option: C
Explanation:

This is the correct option. Carbon monoxide (CO) is a colourless, odourless and tasteless gas that is slightly less dense than air. It is toxic to humans and animals. 

During photosynthesis, which gas is consumed and which is released by plants?

  1. Carbon dioxide and oxygen

  2. Oxygen and carbon dioxide

  3. Carbon dioxide and nitrogen

  4. Nitrogen and oxygen

  5. Argon and nitrogen

Show answer
Correct Option: A
Explanation:

This is the correct option. During photosynthesis, carbon dioxide is consumed and oxygen is released by plants.

Two labourers died due to asphyxiation when they placed a burning angeethi in their room while sleeping. Which of the following causes asphyxiation?

  1. Lack of nitrogen

  2. Lack of oxygen

  3. Plenty of oxygen

  4. Lack of carbon dioxide

  5. Plenty of helium

Show answer
Correct Option: B
Explanation:

This is the correct option. Asphyxiation is caused due to lack of oxygen.

Trisha's father bought her a gas balloon, but as her grip loosened, the balloon flew away. Which of the following gases was used in the balloon?

  1. Oxygen

  2. Carbon dioxide

  3. Helium

  4. Liquefied petroleum gas

  5. Carbon monooxide

Show answer
Correct Option: C
Explanation:

This is the correct option. As helium is lighter than air, it is used in balloons.

__________ will not add pollutants to the air.

  1. Smoke from factories

  2. Irrigating farmland

  3. Manufacturing of paints

  4. Burning of wood

  5. Use of insecticides

Show answer
Correct Option: B
Explanation:

 This is the correct option. Irrigating farmland and crops will not add in the air pollution.

Nitrogen is one of the useful gases. Which of the following statements is not a correct?

  1. Nitrogen is used in slowing down the process of combustion.

  2. It dilutes the concentration of oxygen.

  3. Nitrogen is used in the manufacture of ammonia.

  4. Aquatic plants use dissolved nitrogen for respiration.

  5. Nitrogen is required in plants and is part of chlorophyll pigment.

Show answer
Correct Option: D
Explanation:

This is the correct option as this statement is not correct. Fishes and aquatic plants do not use dissolved nitrogen for breathing and respiration. Dissolved oxygen is used by fishes and aquatic plants for breathing.

___________ is the lightest gas in the air.

  1. Hydrogen

  2. Helium

  3. Ammonia

  4. Neon

  5. Methane

Show answer
Correct Option: A
Explanation:

This is the correct option. Hydrogen, which is an extremely inflammable gas, is the lightest gas.

Mountaineers carry oxygen cylinders with them. What is the main reason to do so?

  1. Volume of oxygen increases with the altitude.

  2. Volume of oxygen decreases with the altitude.

  3. Due to the presence of nitrogen on high altitudes

  4. As the air becomes thick at high altitudes, breathing becomes difficult.

  5. Due to the presence of poisonous gases at high altitudes

Show answer
Correct Option: B
Explanation:

This is the correct option. The volume of oxygen decreases with the rise in altitude. So, mountaineers carry oxygen cylinders.

Why should we breathe from our nose and not from our mouth?

  1. Becaus fFine hair and mucus present inside the nose prevent dust particles from getting into the respiratory system.

  2. Becaus we loose more water during expiration when we use our nose for breathing.

  3. Because our nose purifies the oxygen and the mouth does not purify oxygen.

  4. Because we can breathe more from our nose because of the shorter pathway of air and larger diameter as compared to the mouth.

  5. None of the above

Show answer
Correct Option: A
Explanation:

This is the correct option. Fine hair and muscus do not allow the harmful dust particles from getting inside our respiratory system.

Which of the following statements is/are incorrect?

(a) We can see and feel air. (b) Atmosphere is essential for life on earth. (c) Oxygen is not necessary for burning and breathing. (d) Plants and animals exchange air and are interdependent on each other.

  1. a and b

  2. b and d

  3. a and c

  4. c and d

  5. a and d

Show answer
Correct Option: C
Explanation:

This is the correct option as both the statements are incorrect, because we cannot see air, but can feel it. Also, oxygen is necessary for burning and breathing.

Why is oxygen, in its purified form, used in hospitals?

  1. For artificial respiration

  2. For burning of medical waste

  3. Oxygen is used in providing pneumatic pressure in medical equipments.

  4. Decomposition of bodies

  5. To clean medical equipment

Show answer
Correct Option: A
Explanation:

This is the correct option. Oxygen in its purified form is used for artificial respiration in hospitals.

Which of the following body parts is used by fishes for respiration?

  1. Skin

  2. Gills

  3. Scales

  4. Fins

  5. Liver

Show answer
Correct Option: B
Explanation:

The gills are respiratory organs for the extraction of oxygen from water and for the excretion of carbon dioxide. 

The atmosphere is made up of four layers. Which of the following is not a layer of the atmosphere?

  1. Troposphere

  2. Thermosphere

  3. Stratosphere

  4. Mesosphere

  5. Biosphere

Show answer
Correct Option: E
Explanation:

The biosphere is the global sum of all ecosystems. It can also be termed the zone of life on Earth. The biosphere is the global ecological system integrating all living beings and their relationships, including their interaction with the elements of the lithosphere, hydrosphere, and atmosphere.

Which of the following is/are the usage(s) of air?

  1. Air helps in the movements of sailing yachts, gliders, parachutes and aeroplanes.

  2. Birds, bats and insects can fly due to the presence of air.

  3. Air is used by humans and other living beings for respiration.

  4. Air plays an important role in water cycle.

  5. All of the above

Show answer
Correct Option: E
Explanation:

This is the correct option as all the above mentioned options are the usages of air.

Match the following.

a. Nitrogen 1. Mixture of gases
b. Carbon dioxide 2. Major part of air
c. Air 3. Burning of fuels
d.Pollution 4. Used by plants to make food

  1. a - 1, b - 2, c - 3, d - 4

  2. a - 4, b - 3, c - 2, d - 1

  3. a - 2, b - 4, c - 1, d - 3

  4. a - 2, b - 4, c - 3, d - 1

  5. a - 4, b - 2, c - 1, d - 3

Show answer
Correct Option: C
Explanation:

This is the correct option. Nitrogen constitutes a major part of air, carbon dioxide is used by plants to make food, air is a mixture of gases and pollution is caused by burning of fuels.

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