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Environmental Engineering in CE

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?

Hydrogen
Carbon monoxide
Acetylene
Ammonia

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Environmental Engineering in CE
Polluted water having low BOD are most economically treated in

Clarifier
Sludge digester
Oxidation ponds
Sedimentation tanks

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Environmental Engineering in CE
Reingleman chart is used for the evaluation of __________ pollution.

Water
Radioactive
Air
Noise

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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)
Silicosis
Respirtory ailments (e.g. bronchitis)
Blurred vision

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Environmental Engineering in CE
Inorganic impurities causing water pollution is

Salts of metals
Carbohydrates
Fats
Protein

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Environmental Engineering in CE
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

1
0.05
15
6.5

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