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Air Around Us

Description: Science, Biology, Air
Number of Questions: 15
Created by:
Tags: Science Where is Air Present? Oxygen as a Component of Biotic and Abiotic World Composition of Air Air Around us Air Pollution Vocabulary
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Which of the following is the component of air that is used by green plants to make their food?

  1. Oxygen

  2. Carbon dioxide

  3. Nitrogen

  4. Argon

  5. Ozone

Show answer
Correct Option: B
Explanation:

Yes, it is the correct answer.

Sunny was feeling suffocated in his room when he noticed something was burning. Which of the following gas was causing suffocation in the room?

  1. Oxygen

  2. Carbon dioxide

  3. Nitrogen

  4. Helium

  5. Argon

Show answer
Correct Option: B
Explanation:

Yes, it is correct. The suffocation was due to excess of carbon dioxide that might have been accumulating in the room, as the burning continued.

Which of the above statements is/are incorrect? (A) Air in motion is called wind. (B) Air is absent in water and soil. (C) Aquatic animals use dissolved air in water for respiration.

  1. Only A

  2. Only B

  3. Only C

  4. Both A and C

  5. Both A and B

Show answer
Correct Option: B
Explanation:

Yes, this statement is incorrect.  Air is present in water and soil.

____________, the major component of air does not support burning.

  1. Oxygen

  2. Argon

  3. Nitrogen

  4. Carbon dioxide

  5. Helium

Show answer
Correct Option: C
Explanation:

Correct. Nitrogen, the major component of air does not support burning.

Riya was conducting an experiment and she lit two candles on a table. Then she covered one of the candles with a tall glass. After sometime the candle covered with the glass stopped burning and the other candle continued to burn.

Which of the following reasons will best explain why the covered candle blew out?

  1. Presence of carbon dioxide when the candle is covered.

  2. Presence of nitrogen when the candle is covered.

  3. Absence of carbon dioxide when the candle is covered.

  4. Absence of oxygen when the candle is covered.

  5. Both options 2 and 4.

Show answer
Correct Option: D
Explanation:

Correct. Absence of oxygen in the air for the covered candle caused it to blow out. Burning can occur only in thepresence of oxygen and when most of this oxygen is used up by the burning candle, it can no longer burn and blows out.

What prevents dust particles from getting into the respiratory system?

  1. Fine hair and mucus in the nose

  2. The air pipe in the nose is very thin

  3. There are bends in the air way in the nose

  4. The skin inside the nose acts as dust conditioner

  5. All of the above

Show answer
Correct Option: A
Explanation:

Correct. Fine hair and mucus are present inside the nose to prevent dust particles from getting into the respiratory system.

Which of the following options best describe how is the oxygen in atmosphere replaced?

  1. Through air cycle

  2. Through the ozone layer

  3. Through respiration of plants

  4. Through atmospheric pressure

  5. Through the composition of air

Show answer
Correct Option: C
Explanation:

Correct. Plants take in carbon dioxide present in the atmosphere to make food and release oxygen into the atmosphere. This is how oxygen in atmosphere is replaced.

Mahima was boiling water for making tea when she noticed tiny bubbles well before the water began to boil. She wondered what made the bubbles. Which of the following options will explain to Mahima what were these bubbles?

  1. The heat from the gas causes bubbles in the water at heating.

  2. The carbon dioxide due to burning of the gas causes bubbles in the water when heating.

  3. The dissolved oxygen in the water causes bubbles in the water when heating.

  4. The chemicals in the water escaping due to the heat causes bubbles in the water when heating.

  5. The dissolved carbon dioxide in the water causes bubbles in the water at heating.

Show answer
Correct Option: C
Explanation:

Correct. The bubbles come from the air dissolved in water.

Which gas is essential in animal respiration?

  1. Ozone

  2. Oxygen

  3. Carbon dioxide

  4. Nitrogen

  5. Helium

Show answer
Correct Option: B
Explanation:

Correct. Animals and humans breathe in oxygen and give out carbon dioxide during respiration.

Aquatic animals use ______________ in water for respiration.

  1. dissolved nitrogen

  2. dissolved air

  3. dissolved carbon dioxide

  4. carbon dioxide

  5. dissolved nitrogen

Show answer
Correct Option: B
Explanation:

 Aquatic animals use dissolved oxygen in water for respiration.

Why during a recent incident of fire, the firefighters wrapped a woolen blanket over the girl they rescued from the burning house?

  1. It blocks oxygen in the air from getting to the fire.

  2. It blocks carbon dioxide in the air from getting to the fire.

  3. It helps block the flames from reaching a person.

  4. It blocks the heat from burning a person.

  5. It keeps a shocked person warm.

Show answer
Correct Option: A
Explanation:

Correct. It blocks oxygen in the air from getting to the fire.

Match the gases in column A with their properties in column B:

 
COLUMN A
COLUMN B
A Nitrogen 1 occupies space
B Oxygen 2 supports burning
C Air 3 does not support burning

  1. A - 1, B - 2, C - 3

  2. A - 2, B - 1, C - 3

  3. A - 3, B - 1, C - 2

  4. A - 2, B - 3, C - 1

  5. A - 3, B - 2, C - 1

Show answer
Correct Option: E
Explanation:

Correct. Air occupies space. Oxygen supports burning. Nitrogen does not support burning.

While watering the plants in the garden, Rohan saw earthworms coming out of the soil, where a puddle had formed in the soil. Choose the reason for earthworms coming out of the soil, from the options given below.

  1. Because the earthworm did not like water.

  2. Because the earthworm wanted to bathe in the water.

  3. Because the earthworm wanted to get dry in the air after getting wet.

  4. Because the earthworm could not breathe.

  5. Because the earthworm could not swim.

Show answer
Correct Option: D
Explanation:

Correct. When the water is poured on the lump of soil, it displaces the air which is seen in the form of bubbles. The organisms that live inside the soil and the plant roots respire in this air. The earthworm came out because the water had displaced the air present in the soil and it could not breathe.

Why are there long chimneys in the factories?

  1. So that they can be seen from far.

  2. So that no one can see the smoke coming out of them.

  3. Because of the huge fires inside the factories there is a lot of smoke.

  4. So that they take the harmful smoke and gases away from humans.

  5. Because of the heat generated from the big fires

Show answer
Correct Option: D
Explanation:

Yes, the burning of fuel also produces smoke. Smoke contains a few gases and fine dust particles and is often harmful. The long chimneys take the harmful smoke and gases away from us.

Which of the following roles are played by the air plays in the life cycle on Earth? (a) Air helps in the movements of sailing yachts, gliders, parachutes and airplanes.
(b) Birds, bats and insects can fly due to the presence of air. (c) Air plays an important role in water cycle. (d) Air helps in the dispersal of seeds and pollen of flowers of several plants.

  1. a, b and d

  2. a, b and c

  3. a, c and d

  4. none of them

  5. all of them

Show answer
Correct Option: E
Explanation:

Correct. Air plays an important role in the life cycle of Earth. All these are possible only because of presence of air.

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