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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?

Pulverised limestone
Active carbon
Bog iron (iron oxide)
Silica gel

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Environmental Engineering in CE
Smog is

Nothing but black smoke
A combination of smoke and fog
A liquid particle resulting from vapor condensation
A solid particle e.g. flyash

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Environmental Engineering in CE
Septic tanks are used for the __________ of the deposited solids.

Anaerobic decomposition
Separation
Aerobic decomposition
None of these

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Environmental Engineering in CE
Cleaning is done by(i) Scraping and removal in filters slow sand(ii) Back washing in slow sand filters(iii) Scraping and removal in filters rapid sand(iv) Back washing in rapid sand filtersThe correct answer is

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

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Environmental Engineering in CE
Which of the following is the most major constituents of air pollutants?

Carbon monoxide
Oxides of nitrogen
Oxides of sulphur
Hydrogen sulphide

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Environmental Engineering in CE
Presence of excess flourine in water causes

Fluorosis
Tooth decay
Dental cavity
Respiratory disease

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