CBSE  /  Class 7  /  Social Science  /  Geography Air

  • 1. 
    Which gas released in the atmosphere creates a greenhouse effect trapping the heat?

  • Carbon dioxide
  • Oxygen
  • Nitrogen
  • All of these

  • 2. 
    Excess amount of CO2 is responsible for

  • global cooling
  • global warming
  • both (a) and (b)
  • none of these

  • 3. 
    What are the important objects for survival of plants and animals?

  • Rainfall
  • Sun light
  • Oxygen
  • All of these

  • 4. 
    Which one of the following gases is present in the atmosphere in the highest amount?

  • Oxygen
  • Carbon dioxide
  • Nitrogen
  • Lithium

  • 5. 
    Which gas is used by the green plants to make their food?

  • Oxygen
  • Carbon dioxide
  • Nitrogen
  • None of these

  • 6. 
    Which is the important gas used by human beings for breathing?

  • Nitrogen
  • Carbon dioxide
  • Oxygen
  • Sodium chloride

  • 7. 
    When the air is heated it becomes

  • Lighter?
  • Heavier?
  • Colder?
  • None of these

  • 8. 
    What is the average height of the troposphere?

  • 3 km
  • 6 km
  • 9 km
  • 13 km

  • 9. 
    As we go up in troposphere layer of the atmosphere the pressure

  • increases
  • decreases
  • no change
  • all of these

  • 10. 
    Which one of the following gases protects us from harmful sun’s rays?

  • Ozone
  • Nitrogen
  • Carbon dioxide
  • Oxygen
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