engineering recuitment BHEL Engineer Trainee Mock Test 2025 Environmental Engineering Quality and Characteristics of Sewage
If a 2% solution of sewage is incubated for 3 days at 27° C, and the dissolved oxygen depletion is 6 mg/L, then the BOD of the sample would
1
30 mg/L
2
600 mg/L
3
500 mg/L
4
300 mg/L