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Teaching Environmental Studies Travel and Communication Question Bank Questions - Travel

  • question_answer
    The situation of depletion of ozone layer is referred as ozone hole. If the ozone level decreases below             (PTET Feb 2011)

    A) 800DU

    B) 400DU

    C) 200DU

    D) None of the above

    Correct Answer: C

    Solution :

    [c] Thickness of ozone layer is measured in Dobson Units (DU). The level above 200 DU is considered as normal, but if this level decreases, it is considered as ozone hole.


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