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Standard XII
Biology
Question

Air is composed of gases, water vapours and :
  1. dust particles
  2. rainfall
  3. snowfall
  4. light

A
dust particles
B
light
C
snowfall
D
rainfall
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Solution
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Other than gases and water vapours, air also contains dust particles. Some dust particles are lighter enough to float in air in the form of suspended particles.

Therefore, air is composed of gases, water vapours and dust particles.

Hence, option (A) is the correct answer.

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Q1
Air is a mixture of many gases, dust particles and water vapour.
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Q2
Air is composed of gases, water vapours and :
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Q3

Statement I: Air is a mixture of gases, water vapour and dust particles.

Statement II: Air is composed of only one gas that is nitrogen.

Statement III: Air is composed of two gases, nitrogen and oxygen only.

Which of the above statement is incorrect?


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Q4

What percentage of air is accounted by carbon dioxide, water vapour, dust particles and other gases?


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Q5

John wanted to know about the composition of air. He asked Sam to explain it to him whether air is composed of a single component or more than one component. To reply this query Sam made the following statements:

Statement I: Air is a mixture of gases, water vapour and dust particles.

Statement II: Air is composed of only one gas that is nitrogen.

Statement III: Air is composed of two gases, nitrogen and oxygen only.

Statement IV: Air is made up of more than one components.

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