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  5. Pollution of Air and Water

Railways General Science & Technology Pollution of Air and Water Sample Paper Water Pollution Sample Test Paper-21

  • question_answer
    In B.O.D. test oxygen plays an important role to

    A)  Destroy inorganic matter

    B)  Destroy pollution

    C)  Destroy waste organic matter

    D)  None of these

    Correct Answer: C

    Solution :

     BOD means number of milligrams of \[{{O}_{2}}\]required for decomposition of one litre of waste by decomposing microorganisms (bacteria).


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