Air


 
 
Concept Explanation
 

Air

Air is All Around Us  :

  A thick blanket of air called the atmosphere, surrounds our Earth. Air is also present in thing which seem to be empty

Composition Of Air

It contains mainly nitrogen and oxygen it also contains carbon dioxide noble gases water vapour, dust particles and traces of other gases.

Nitrogen And Oxygen :  Air contains about 78% nitrogen and 21% oxygen . Oxygen in air supports burring whereas nitrogen does not.

Carbon Dioxide :  Air contains about 0.03% of carbon dioxide .Plant and animals take in oxygen and give out carbon dioxide during respiration

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Sample Questions
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Question : 1

How many gases does air contain?

Right Option : D
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Question : 2

Plants use _________________________  for preparing food which in turn gives food to the entire Living world

Right Option : B
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Question : 3

The dust particles move in a ____________________ way in a beam of light .

Right Option : B
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Explanation
 
 
 


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