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Environmental Engineering in CE

Environmental Engineering in CE
The pH value of oxidised sewage is about

13.4
6.2
7.3
1.8

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Environmental Engineering in CE
Industrial workers working in leather tanning & manufacturing units are prone to suffer from

Skin diseases (e.g. dermatities)
Blurred vision
Respirtory ailments (e.g. bronchitis)
Silicosis

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Environmental Engineering in CE
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Acetylene
Hydrogen
Ammonia
Carbon monoxide

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Environmental Engineering in CE
Which of the following pollutants is not emitted during volcanic eruptions?

SO₂
CO
Hydrocarbons
H₂S

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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

Petroleum refinery
Food industry
Municipal sewage treatment
Iron & steel plant

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

Ferric chloride
Sodium aluminate
Alum (aluminium sulphate)
Lime

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