• Air Around Us - II (2016)
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Air Around Us - II (2016)

Description: Air Around Us – II
Number of Questions: 15
Created by:
Tags: Air Around Us – II Writing Decimals as Fractions Writing Fractions as Decimals Composition of Air Properties of Air How Living Things use Air for Survival
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Raj's car is parked outside the house for two days during winter. After two days, he saw that the windscreen of the car has becomes hazy. Which of the following can be the reason for the haziness of the windscreen?

  1. Presence of dust particles

  2. Presence of fog

  3. Presence of smoke particles

  4. All of the above

Show answer
Correct Option: D
Explanation:

Due to presence of dust and smoke particles, the windscreen becomes hazy and presence of fog also affects the windscreen.

What is/are the use(s) of air for plants?

  1. The dispersal of seeds

  2. The dispersal of pollen of flowers

  3. Air is a source of Nitrogen for them

  4. Both (1) and (2)

Show answer
Correct Option: D
Explanation:

Air helps in the dispersal of seeds and pollen of flowers of several plants. Air is not the source of nitrogren for plants which they take from soil alone.

The policeman regulating traffic at a crowded crossing often wears a mask. What is/are the reason(s)? (a) To release oxygen from the mask (b) To prevent himself from the dust and smoke (c) So that he doesn't have to hold a handkerchief when he sneezes as his hands are preoccupied directing the traffic

  1. Only (a)

  2. Only (b)

  3. Only (b) and (c)

  4. Only (c)

Show answer
Correct Option: B
Explanation:

The mask will prevent dust and smoke particles from getting into the respiratory system of the policeman.

Why is one advised to throw a blanket over a burning object during an incident of fire?

  1. To cut off the contact between oxygen and the burning object

  2. To cut off the contact between nitrogen and the burning object

  3. To cut off the contact between noble gases and the burning object

  4. To cut off the contact between water vapours and the burning object

Show answer
Correct Option: A
Explanation:

The  process of combustion cannot take  place in the absence of oxygen. Hence fire can be extinguished by cutting off the supply of oxygen which is the supporter of combustion. 

Which of the following statements is/are true? (a) Air contains water vapours. (b) When air comes in contact with a hot surface, it condenses. (c) When water vapour from the air condenses, the drops of water appear on the surface of an object.

  1. Only (a)

  2. Only (b) and (c)

  3. Only (a) and (c)

  4. Only (b)

Show answer
Correct Option: C
Explanation:

Air contains water vapours and when air comes in contact with a cool surface, water vapour condenses and drops of water appear on the cooled surface of an object.

Sonam went on the roof of her house with a firki and noticed that her firki starts rotating. What is/are the reason(s)? (a) Beacause the side of the firki facing the sun gets hotter and hence becomes lighter which causes it to rotate (b) Because the force of air was rotating the firki (c) Because the structure of a firki is such that it is not alligned with its central rotational axis which causes it to keep on rotating

  1. Only (a) and (b)

  2. Only (b)

  3. Only (c)

  4. Only (a) and (c)

Show answer
Correct Option: B
Explanation:

The force exerted by the moving air helps the firki to rotate.

What happens to a lump of cotton wool when it is put in cold water?

  1. The lump of cotton wool expands.

  2. The lump of cotton wool shrinks.

  3. The lump of cotton wool disintegrates and dissolves in water.

  4. Both (1) and (3)

Show answer
Correct Option: B
Explanation:

The lump of cotton wool shrinks. Air is present in the cotton wool. When it is dipped in water, air present in the cotton wool escapes and it shrinks.

Plants and animals depend on each other for exchange of _______ and ______ from air.

  1. oxygen; carbon dioxide

  2. oxygen; nitrogen

  3. carbon dioxide; water

  4. carbon dioxide; nitrogen

Show answer
Correct Option: A
Explanation:

The plants and animals depend on each other for exchange of oxygen and carbon dioxide from air. Plants use up large amounts of carbon dioxide and give out oxygen during photosynthesis and hence they help to maintain the level of gases in the air. 

Which of the following statements is/are true?

  1. Animals use air for respiration.

  2. Plants use air to prepare their food.

  3. Air helps in power generation by wind turbines.

  4. All of the above

Show answer
Correct Option: D
Explanation:

Animals use air for respiration, plants use air for preparing their food and air helps in power generation by wind turbines.

If there is no oxygen in the room and Rani throws a burning paper inside that room, what will happen to the burning paper?

  1. Paper will start burning rapidly.

  2. Paper will start burning slowly.

  3. Paper will not burn anymore.

  4. Paper will produce oxygen on burning.

Show answer
Correct Option: C
Explanation:

As there is no oxygen in the room, the paper will not burn anymore. Burning can occur only in the presence of oxygen.

Which of the following statements is true?

  1. Air is transparent.

  2. Air does not occupy space.

  3. Air is not so essential for life on earth.

  4. Air is not present in the soil.

Show answer
Correct Option: A
Explanation:

Air is transparent, air occupies space and air is essential for life on earth. Air is present in soil and water also.

Which of the following statements is/are true?

  1. Air helps in the movements of sailing yachts.

  2. Air helps in the movements of a kite.

  3. Air helps in the movements of aeroplanes and gliders.

  4. All of the above

Show answer
Correct Option: D
Explanation:

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

Why does all the oxygen in the atmosphere not get used up though a large number of organisms are consuming it?

  1. Oxygen is produced using oxygen cylinders.

  2. Oxygen is replenished in the air by the plants during photosynthesis.

  3. Oxygen is released in the atmosphere from the oceans by aquatic animals.

  4. Oxygen is released in the atmosphere by respiration of animals.

Show answer
Correct Option: B
Explanation:

Oxygen is replenished in the air by the plants during photosynthesis.

Raju has a beaker filled with water. He started heating the water with a burner. Before the water began to boil, he saw tiny bubbles in the water beaker. What do these bubbles show?

  1. Water is evaporating

  2. Air is dissolved in water

  3. Bubbles of hydrogen are coming out

  4. Both (1) and (3)

Show answer
Correct Option: B
Explanation:

Air dissolved in the water comes out in form of bubbles when it is heated.

The major part of air which does not support burning is _________.

  1. carbon dioxide

  2. oxygen

  3. nitrogen

  4. hydrogen

Show answer
Correct Option: C
Explanation:

Nitrogen is the major part of air which does not support burning and thus, it helps to control the rate of combustion.

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