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Environmental Engineering in CE

Environmental Engineering in CE
Soluble silica present in boiler feed water can be removed by

Filtration
Coagulation
Preheating it
Anion exchanger

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Environmental Engineering in CE
Most of the bacteria in sewage are

Anerobic
Parasitic
None of these
Saprophytic

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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
120
105
60

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Environmental Engineering in CE
Carcinogenic air pollutants cause

Asphyxiation (suffocation)
Anemia
Cancer
Bone decay

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Environmental Engineering in CE
Radioactive substances present in the polluted water stream can be removed by

None of these
Coagulation and filtration
Biological oxygen treatment
Adsorption in ion exchange materials

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Environmental Engineering in CE
Turbidity of water is an indication of the presence of

Dissolved solids
Floating solids
Suspended inorganic matter
Dissolved gases

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