Tag: composition of air

Questions Related to composition of air

Most abundant constituent of dry air in terms of volume is:

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. carbon dioxide

  2. helium

  3. nitrogen

  4. oxygen

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Correct Option: C
Explanation:

The most abundant gas in the Earth's atmosphere is nitrogen, which accounts for about 78% of the mass of dry air. 

Oxygen is the next most abundant gas, present at levels of 20 to 21%. 
Although humid air seems like it contains a lot of water, the maximum amount of water vapour that air can hold is only about 4%.

Hence, the correct option is $\text{C}$

In desert areas, water vapor content is :

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. different

  2. higher

  3. low

  4. constant

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Correct Option: C
Explanation:

In desert areas, water vapour content is low because deserts are hot areas as there is a lack of water and if there is lack of water than there is lack of water vapour.

Evaporation of water in shade is:

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. fast

  2. faster

  3. slower

  4. none of these

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Correct Option: C
Explanation:

Evaporation of water in shade is slower, as the sun's heat increases the energy of water molecules, and they start moving faster, eventually leading to evaporation when the energy is enough to convert into a gas.

Two forms of oxygen found in the atmosphere are:

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. water and oxygen

  2. oxygen and carbon dioxide

  3. carbon dioxide and water

  4. oxygen and ozone

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Correct Option: D
Explanation:

The two forms of oxygen found in the atmosphere are

  1. Oxygen, $O _2$
  2. Ozone, $O _3$ is found upper layer of the atmosphere.

Which of the following constituent gas is not directly used by the living beings?

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. Oxygen

  2. Nitogen

  3. Hydrogen

  4. Carbon dioxide

Show answer
Correct Option: B
Explanation:

Nitrogen gas cannot be used by the human beings directly, breathing pure nitrogen means we're not breathing oxygen, which means that we'll die of oxygen deprivation in a matter of minutes
Hence option B is correct.