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Environmental Engineering

Environmental Engineering
If the sewage contains grease and fatty oils, these are removed in

Detritus tanks
Sedimentation tanks
Grit chambers
Skimming tanks

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Environmental Engineering
The ratio of 5 day BOD to ultimate BOD is about

43864
43894
43833
1

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Environmental Engineering
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is

Steel
Copper
Reinforced cement concrete
Cast iron

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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

200 ppm
100 ppm
400 ppm
300 ppm

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Environmental Engineering
The most common cause of acidity in water is

Carbon dioxide
Hydrogen
Oxygen
Nitrogen

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Environmental Engineering
The type of valve, which is provided on the suction pipe in a tube-well, is

Sluice valve
Pressure relief valve
Reflux valve
Air relief valve

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MORE MCQ ON Environmental Engineering

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