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Environmental Engineering in CE

Environmental Engineering in CE
Nitrogen oxides (NOx) is not produced in the __________ industry.

Any of these
Nitric acid making
Detergent
Nitrogenous fertiliser

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Environmental Engineering in CE
Presence of nitrates in water in excess of 50 ppm causes

Mathenoglobenemia
Asphyxiation
Tooth decay
Gastroentetitis

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Environmental Engineering in CE
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.

Parasitic
Anaerobic
Aerobic
Saphrophytic

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Environmental Engineering in CE
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

90
105
60
120

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Environmental Engineering in CE
The commonest form of iron & manganese found in ground water as pollutant is in the form of their

Chlorides
Carbonates
Bi-carbonates
Sulphides

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Environmental Engineering in CE
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Fluctuation in liquid flow
Cavitation
Pipe vibrations
Boundary layer separation

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