836Civil EngineeringMedium
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________?
A50 mg/l
B150 mg/l
C100 mg/l
D250 mg/l
Correct answer
D. 250 mg/l
Explanation
The correct answer is 250 mg/l.