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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

Ra-226
Au-198
I-131
Sr-90

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Environmental Engineering in CE
'Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a 'particulate'?

Dust & mists
Photochemical smog & soot
Smoke & fumes
None of these

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Environmental Engineering in CE
Which of the following fine dust removal equipments is the most efficient?

Scrubber
Bag filter
Cyclone separator
Electrostatic precipitator

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Environmental Engineering in CE
__________ substances present in sewage are removed in grit chamber during sewage treatment.

Dissolved
Organic
Inorganic
Fatty

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Environmental Engineering in CE
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in

Municipal sewage treatment
Food industry
Petroleum refinery
Iron & steel plant

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Environmental Engineering in CE
Which is the most widely used coagulant for the treatment of turbid water?

Lime
Alum (aluminium sulphate)
Ferric chloride
Sodium aluminate

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