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SSC Sample Paper SSC (Group-C) Sample Test Paper-10

  • question_answer
    Clean water would have BOD value of less than:

    A)  5ppm                         

    B)  19ppm

    C)  25ppm            

    D)       50ppm

    Correct Answer: A

    Solution :

     A BOD level of 1-2 ppm is considered very good. A water supply with a BOD level of 3-5 ppm is considered moderately clean. In water with a BOD level of 6-9 ppm, the water is considered some-what polluted. At BOD levels of 100 ppm or greater, the water supply is considered very polluted with organic waste.


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