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civil engineering waste water engineering
1. If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is
(A): 100 mg/l
(B): 150 mg/l
(C): 200 mg/l
(D): 250 mg/l.
(E): 50 mg/l
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