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Air Around Us-III

Description: Air
Number of Questions: 19
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Tags: Air Properties of Air How Living Things use Air for Survival Air Around us Composition of Air
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Which components of air are present in the air exhaled by humans during breathing?

  1. Only CO2

  2. More CO2 and less O2

  3. N2, CO2, O2 and water vapour

  4. CO2, O2 and water vapour

Show answer
Correct Option: C

Which of the following statements is correct?

  1. Carbon dioxide allows the earth to radiate heat rapidly at night.

  2. Percentage of carbon dioxide in air varies form 3% to 4%.

  3. Argon is a noble gas which is used for filling electric bulbs.

  4. A combustible substance combines with nitrogen to liberate heat energy.

Show answer
Correct Option: C
Explanation:

Argon is used to fill light bulbs to inhibit the evaporation of the tungsten filaments and increase bulb life.

Which of the following gases is not a greenhouse gas?

  1. Carbon dioxide

  2. Water vapour

  3. Methane

  4. Nitrogen dioxide

Show answer
Correct Option: D
Explanation:

Nitrogen dioxide is not a greenhouse gas.

Which of the following does not cause air pollution?

  1. Thermal power station

  2. Hydroelectric plant

  3. Nuclear plant

  4. Cement factories

Show answer
Correct Option: B

Which of the following statements about air is correct?

  1. Air can be seen.

  2. Air can be smelt

  3. Air can be tasted

  4. Air can be felt

Show answer
Correct Option: D

Welding is a source of which air pollutant?

  1. SO2

  2. CO

  3. O3

  4. CO2

Show answer
Correct Option: C
Explanation:

During welding air pollutants are released and ozone is the most abundant of all of theses pollutants. 

Which of the following terms correctly defines air?

  1. Compound

  2. Element

  3. Mixture

  4. Atom

Show answer
Correct Option: C
Explanation:

Air is a mixture of various gases. The main gases present in air are nitrogen (78.1% by volume) and oxygen (20.9% by volume). These two gases together form 99% of the air. Besides these two, air contains small amounts of carbon dioxide (0.03 to 0.04%), water vapour (variable), noble gases (0.94%), and dust particles.

Consider the following activity: Invert a gas jar containing nitric oxide over the jar containing air. Reddish brown gas will be observed in the two jars. The presence of which of the following gases in air is proved by the above activity?

  1. Nitrogen

  2. Argon

  3. Oxygen

  4. Krypton

Show answer
Correct Option: C
Explanation:

Oxygen present in air reacts wiyh nitric oxide results of form reddish brown gas.

Consider the following activity: When a beaker full of lime water is kept in air for about one hour, the lime water turns milky. The presence of which of the following gases in air is proved by the above activity?

  1. Nitrogen

  2. Carbon dioxide

  3. Argon

  4. Xenon

Show answer
Correct Option: B
Explanation:

Carbondioxide turns lime water milky.

What happens when a glass full of ice cold water is placed on a table for 10 minutes?

  1. All water changes into ice.

  2. Color of the water turns milky

  3. Drops of water collect on the outer surface of the glass

  4. Water evaporates immediately

Show answer
Correct Option: C

Consider the following statements about the components of air: a. Nitrogen helps in diluting the effect of oxygen. b. Oxygen does not support combustion and burning. c. Noble gases are present in trace quantities in air. d. Water vapours are always presents in large quantities in air.

Which of the given statements about components of air are correct?

  1. a and b

  2. b and c

  3. a and c

  4. b and d

Show answer
Correct Option: C
Explanation:

The main gas present in the air is nitrogen (78.1% by volume) and it helps in diluting the effect of oxygen. The noble gases present in the air are helium, neon, argon, krypton and xenon. Since the percentage of these gases is very small, so, these gases are also called "rare gases".

Which of the following statements is not correct about the respiration in living things?

  1. When living things breathe, they take air which contains oxygen.

  2. Plants and animals that live in water get oxygen from the air dissolved in water.

  3. The process of respiration uses carbon dioxide and produce oxygen and water vapors along with energy

  4. Respiration is a slow process and takes place at body temperature.

Show answer
Correct Option: C

Which of the following statements is not correct about the characteristics of air?

  1. The composition of air is variable

  2. The components retain their original properties

  3. Air can be represented by a chemical formula

  4. Components of air do not react with each other

Show answer
Correct Option: C

Which of the following facts justifies the given characteristics of air? � The components retain their original properties�

  1. Amount of water vapors in air is higher in monsoon than that in the summer.

  2. Oxygen element support burning. Oxygen present in air support burning too.

  3. There is no release or absorption of energy a sample of air is prepared.

  4. Nitrogen and oxygen can be separated by boiling and condensing the liquid air.

Show answer
Correct Option: B

Which of the following facts justifies the given characteristic of air? “The composition of air is variable”.

  1. Air on plains contains more amount of oxygen as compared to air at very high altitudes.

  2. The element oxygen supports burning. Oxygen present in the air support burning too.

  3. Nitrogen and oxygen can be separated by boiling and condensing the liquid air.

  4. Molecule of carbon dioxide can turn lime water milky.

Show answer
Correct Option: A
Explanation:

Oxygen is abundant in the plains as compared to high altitudes.

Consider the following statement about inhaled air and exhaled air:

  1. Exhaled air contains more carbon dioxide than inhaled air.
  2. Exhaled air is cooler than inhaled air.
  3. Inhaled air contains more moisture than exhaled air.
  4. Inhaled air contains more oxygen than exhaled air.
    Which of the above statements are correct?

  1. 1 & 2

  2. 2 & 3

  3. 3 & 4

  4. 1 & 4

Show answer
Correct Option: D

Match the components of air given under left column with their characteristics given under right column in the table given below.

 
Components of air Characteristics
1. Nitrogen a. cause rain on condensing
2. Oxygen b. used by green plants to manufacture food
3. Inert gases c. very unreactive
4. Carbon dioxide d. used in the process of respiration
5 Water vapours e. major component of air

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

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

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

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

Show answer
Correct Option: A
Explanation:

Nitrogen is the main component of air and oxuygen is used in the process of respiration and green plants used carbon dioxide for food manufacturing.

Which of the following is the correct order of components of air in terms of their composition in air?

  1. Oxygen > nitrogen > argon > carbon dioxide > other gases

  2. Carbon dioxide > argon > nitrogen > oxygen > other gases

  3. Nitrogen > oxygen > argon > carbon dioxide > other gases

  4. Argon > nitrogen > oxygen > carbon dioxide > other gases

Show answer
Correct Option: C
Explanation:

Nitrogen > oxygen > argon > carbon dioxide > other gases is the correct answer.

In which layer of the atmosphere is most of the air present?

  1. Troposphere

  2. Stratosphere

  3. Mesosphere

  4. Thermosphere

Show answer
Correct Option: A
Explanation:

Air is present in the troposphere layer of atmosphere. 

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