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Multiple Choice Questions
1. If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is
(A): 50 ppm
(B): 100 ppm
(C): 150 ppm
(D): 200 ppm
(E): 250 ppm.
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