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Environmental Engineering in CE

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

Alum (aluminium sulphate)
Sodium aluminate
Ferric chloride
Lime

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Environmental Engineering in CE
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

105
35
95
75

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Environmental Engineering in CE
Green house effect is accentuated by

Rapid industrialisation
Deforestation
Increased transportation activity
All of these

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

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

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Environmental Engineering in CE
Polyvinyl chloride containers are not suitable for storing

Foodstuffs
None of these
Metallic powder
Woolen clothes

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Environmental Engineering in CE
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

Dust
Powder
Grit
Smoke

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