Waste Water Engineering Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to First stage demand Carbonaceous demand Initial demand All of these First stage demand Carbonaceous demand Initial demand All of these ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering Facultative bacteria survive in Both cases A and B Neither A nor B The presence of oxygen The absence of oxygen Both cases A and B Neither A nor B The presence of oxygen The absence of oxygen ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering 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 None of these 250 ppm 200 ppm 225 ppm None of these 250 ppm 200 ppm 225 ppm ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering The minimum diameter of sewer to be adopted is 25 cm 10 cm 15 cm 12.5 cm 25 cm 10 cm 15 cm 12.5 cm ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of Citric acid Sulphuric acid Hydrochloric acid Nitric acid Citric acid Sulphuric acid Hydrochloric acid Nitric acid ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is 150 ppm 50 ppm 100 ppm 200 ppm 150 ppm 50 ppm 100 ppm 200 ppm ANSWER DOWNLOAD EXAMIANS APP
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