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  1. 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the DO. concentration was 5 mg/l. The BOD of raw sewerage is

    2. A.

    100 mg/l
    B.

    200 mg/l
    C.

    300 mg/l
    D.

    400 mg/l.

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    Answer : Option C

    Explanation :

    No answer description available for this question.

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