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Air Around Us

Learn about the composition of air, properties of gases like oxygen and nitrogen, and the vital role air plays in respiration, combustion, water cycles, and various natural phenomena on Earth.

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

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
Question 2 Multiple Choice (Single 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
Question 3 Multiple Choice (Single Answer)

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
Question 4 Multiple Choice (Single Answer)

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

  1. Oxygen
  2. Argon
  3. Nitrogen
  4. Carbon dioxide
  5. Helium
Question 5 Multiple Choice (Single Answer)

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.
Question 6 Multiple Choice (Single Answer)

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
Question 7 Multiple Choice (Single Answer)

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
Question 8 Multiple Choice (Single Answer)

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.
Question 9 Multiple Choice (Single Answer)

Which gas is essential in animal respiration?

  1. Ozone
  2. Oxygen
  3. Carbon dioxide
  4. Nitrogen
  5. Helium
Question 10 Multiple Choice (Single Answer)

Aquatic animals use ______________ in water for respiration.

  1. dissolved nitrogen
  2. dissolved air
  3. dissolved carbon dioxide
  4. carbon dioxide
  5. dissolved nitrogen
Question 11 Multiple Choice (Single Answer)

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.
Question 12 Multiple Choice (Single Answer)

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

 
COLUMN A 
        </strong>|<strong>COLUMN B</strong>|

|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
Question 13 Multiple Choice (Single Answer)

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.
Question 14 Multiple Choice (Single Answer)

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
Question 15 Multiple Choice (Single Answer)

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
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