CBSE  /  Class 9  /  Science  /  Natural Resources

  • 1. 
    The atmosphere of the Earth is heated by radiations which are mainly

  • radiated by the Sun
  • re-radiated by land
  • re-radiated by water
  • re-radiated by land and water

  • 2. 
    If there were no atmosphere around the Earth, the temperature of the Earth will

  • increase
  • go on decreasing
  • increase during day and decrease during night
  • be unaffected

  • 3. 
    What would happen, if all the oxygen present in the environment is converted to ozone?

  • We will be protected more
  • It will become poisonous and kill living forms
  • Ozone is not stable, hence it will be toxic
  • It will help harmful Sun radiations to reach Earth and damage many life forms.

  • 4. 
    One of the following factors does not lead to soil formation in nature

  • the Sun
  • water
  • wind
  • polythene bags

  • 5. 
    The two forms of oxygen found in the atmosphere are

  • water and ozone
  • water and oxygen
  • ozone and oxygen
  • water and carbon dioxide

  • 6. 
    The process of nitrogen-fixation by bacteria does not take place in the presence of

  • molecular form of hydrogen
  • elemental form of oxygen
  • water
  • elemental form of nitrogen

  • 7. 
    Rainfall patterns depend on

  • the underground water table
  • the number of water bodies in an area
  • the density pattern of human population in an area
  • the prevailing season in an area

  • 8. 
    Among the given options, which one is not correct for the use of large amount of fertilisers and pesticides?

  • They are eco-friendly
  • They turn the fields barren after some time
  • They adversely affect the useful component from the soil
  • They destroy the soil fertility

  • 9. 
    The nitrogen molecules present in air can be converted into nitrates and nitrites by

  • a biological process of nitrogen fixing bacteria present in soil
  • a biological process of carbon fixing factor present in soil
  • any of the industries manufacturing nitrogenous compounds
  • the plants used as cereal crops in field

  • 10. 
    One of the following processes is not a step involved in the water-cycle operating in nature

  • evaporation
  • transpiration
  • precipitation
  • photosynthesis
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