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General Knowledge :: Environmental Science

  1. Nitrogen gas returns to the atmosphere by the action of

  2. A.

     Nitrogen fixing bacteria

    B.

     Denitrifying bacteria

    C.

     Nitrifying bacteria

    D.

     Nitrate fertilizers


  3. The most abundant gases in the earth's atmosphere by volume are:

  4. A.

     Carbon dioxide and nitrogen

    B.

     Oxygen and water vapor

    C.

     Nitrogen and oxygen

    D.

     Oxygen and helium

    E.

     Oxygen and ozone


  5. Cigarette smoking exposes one to __________

  6. A.

     Sulphur dioxide

    B.

     Carbon dioxide

    C.

     Nitrogen peroxide

    D.

     Carbon monoxide


  7. Of the gases listed below, which is not believed to be responsible for enhancing the earth's greenhouse effect?

  8. A.

     Chlorofluorocarbons (CFCs)

    B.

     Molecular oxygen (O2)

    C.

     Nitrous oxide (N2O)

    D.

     Carbon dioxide (CO2)

    E.

     Methane (CH4)


  9. The thickness of ozone layer is measured in

  10. A.

     Mm

    B.

     Du

    C.

     Nm

    D.

     Hg


  11. Exponential growth occurs when there is

  12. A.

     A great environmental resistance

    B.

     No environmental resistance

    C.

     No biotic potential

    D.

     A fixed carrying capacity


  13. An increase in albedo would be accompanied by ____ in radiative equilibrium temperature.

  14. A.

     An increase

    B.

     A decrease

    C.

     No change

    D.

     Unstable oscillations


  15. Many wild plant and animals are on the verge of extinction due to

  16. A.

     Habitat destruction

    B.

     Climatic changes

    C.

     Non availability of food

    D.

     None of the above


  17. Most harmful environmental pollutants are

  18. A.

     natural nutrients in excess

    B.

     human organic wastes

    C.

     non-biodegradable chemicals

    D.

     waste animal feed


  19. The destruction of the forest areas by man made efforts is called

  20. A.

     Afforestation

    B.

     Deforestation

    C.

     Non-forestation

    D.

     Bio forestation