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Environmental Engineering in CE

Environmental Engineering in CE
Tri-sodium phosphate is used in boiler water treatment to reduce

Dissolved oxygen
Turbidity
Caustic embrittlement
Suspended silica

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Environmental Engineering in CE
Persons working in cement plants and limestone quarries are more prone to disease like

Asthma
Cancer
Silicosis
Flourosis (bone disease)

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Environmental Engineering in CE
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

Ionosphere
Stratosphere
Troposphere
None of these

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Environmental Engineering in CE
Which of the following sources is responsible for maximum air pollution?

Industrial chimney exhaust
Photochemical oxidation of organic matter
Automobiles exhaust
Forest fire

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Environmental Engineering in CE
Siderosis is a disease caused by the inhalation of __________ dust.

Iron
None of these
Coal
Silica

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Environmental Engineering in CE
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?

Activated carbon adsorption
Chemical coagulation
Biological oxidation pond
Lagooning

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