Environmental Engineering The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of 1 mg/liter 1000 mg/liter 10 mg/liter 100 mg/liter 1 mg/liter 1000 mg/liter 10 mg/liter 100 mg/liter ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The detention period in coagulation tanks is usually kept as 30 to 45 minutes 1 to 2 minutes 2 to 6 hours 2 to 6 days 30 to 45 minutes 1 to 2 minutes 2 to 6 hours 2 to 6 days ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering If the average daily consumption of a city is 100,000 m³, the maximum daily consumption on peak hourly demand will be 100000 m³ 180000 m³ 270000 m³ 150000 m³ 100000 m³ 180000 m³ 270000 m³ 150000 m³ ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The velocity of flow does not depend on Hydraulic mean depth of sewer Roughness of sewer Grade of sewer Length of sewer Hydraulic mean depth of sewer Roughness of sewer Grade of sewer Length of sewer ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Facultative bacteria are able to work in Absence of oxygen only Presence of oxygen only Presence of water Presence as well as in absence of oxygen Absence of oxygen only Presence of oxygen only Presence of water Presence as well as in absence of oxygen ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be 300 ppm 400 ppm 200 ppm 100 ppm 300 ppm 400 ppm 200 ppm 100 ppm ANSWER DOWNLOAD EXAMIANS APP
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