engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Environmental Engineering Waste Water
A sewage sample of 20 ml is diluted with 200 ml of distilled water. The initial and final dissolved oxygen after 5 days is 15 mg/l and 5 mg/l respectively. What is the ultimate BOD value? (Take e-k × 5 = 0.3)
1
10 mg/l
2
110 mg/l
3
160 mg/l
4
200 mg/l