Uses of Air


 
 
Concept Explanation
 

Uses of Air

Air :

Air is the mixture of gases, mainly containing nitrogen and oxygen. Without air life is not possible on Earth.

Uses of Air:

Besides breathing, air is useful to us in many other ways:

  • 1. The wind makes wind mills rotate. The windmills are used to draw water from the tube wells and run flour mills.It is now being used to generate electricity.
  • 2. Aeroplane, helicopters, balloons, parachutes and yachts work because of air.
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    Sample Questions
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    Question : 1

    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.
    Right Option : D
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    Question : 2

    Which of the following are correct :

    (a) Plants require carbon dioxide of the air to make their food by a process called respiration.

    (b) A green house is a glass building used for growing plants that need protection from cold.

    (c) Plants require carbon dioxide of the air to make their food by a process called photosynthesis.

    Right Option : B
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    Question : 3

    How does rusting affect the components of air ?

    Right Option : C
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