engineering recuitment WBMSC Sub Assistant Engineer Civil Mock Test 2023 Environmental Engineering Sewage
The following data pertain to a sewage sample:
Initial DO = 9.5 mg/l, Final DO = 2 mg/l, Dilution = 1%
The BOD of the given sample is:
1
7.5 mg/l
2
10 mg/l
3
75 mg/l
4
750 mg/l