railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Sewage

If 1% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 3 ppm, BOD of the sewage is:

1
225 ppm
2
200 ppm
3
300 ppm
4
250 ppm
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