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Environmental Engineering in CE

Environmental Engineering in CE
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

Hydrocarbons
Hydrogen sulphides
Hydrogen flouride
Nitrogen dioxide

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Environmental Engineering in CE
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.

Anaerobic
Saphrophytic
Parasitic
Aerobic

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Environmental Engineering in CE
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes

Fading of dyes on textiles
All of these
Reduced strength of textiles
Corrosion, tarnishing & soiling of metals

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Environmental Engineering in CE
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is

(ii) and (iv)
(ii) and (iii)
(i) and (iv)
(i) and (ii)

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Environmental Engineering in CE
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.

80
50
25
120

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Environmental Engineering in CE
Lagooning process is mainly a means of the

Reduction of excessive flow in sewers
Sludge disposal
Biological treatment of wastes
None of these

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MORE MCQ ON Environmental Engineering in CE

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