engineering recuitment KPSC Assistant Engineer Civil Mock Test 2020 Environmental Engineering Water Supply
If the depletion of oxygen is found to be 2 mg/l after incubating 3 ml of sewage diluted to 300 ml at 20°C for 5 days, then the BOD5 of the sewage is
1
500 mg/l
2
200 mg/l
3
550 mg/l
4
300 mg/l