Minimum D.O prescribed for a river stream, to avoid fish kill is:
A2 ppm
B4 ppm
C8 ppm
D10 ppm
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Related Questions:
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D of the sewage is:
Both fish life and algae are present in the river zone known as:
Symbiosis, the beneficial association between algae & bacteria is used for treatment of waste water in the following unit:
Zero hardness of water is achieved by ..........................
Maximum consumption of water is noticed in: