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Environmental Engineering in CE

Environmental Engineering in CE
Fresh sewage is __________ in nature.

Neutral
Highly acidic
Alkaline
Acidic

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Environmental Engineering in CE
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?

Sedimentation tank
Chemical coagulation
Circular clarifier
Mechanical flocculation

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Environmental Engineering in CE
__________ is removed from water by lime-soda process.

Permanent hardness
Iron and manganese
Temporary hardness
Foul smell and taste

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Environmental Engineering in CE
The widest explosive limit is of __________ , thereby making it the most explosive gas.

Carbon monoxide
Acetylene
Petrol vapor
Hydrogen

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Environmental Engineering in CE
Smog is

A combination of smoke and fog
Nothing but black smoke
A liquid particle resulting from vapor condensation
A solid particle e.g. flyash

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Environmental Engineering in CE
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the

Burning of domestic fuel
Photochemical reaction in polluted atmosphere
Automobiles exhaust
Industrial chimney exhaust

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