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Environmental Engineering in CE

Environmental Engineering in CE
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called

Skimming mill
Cesspool
Septic tank
Lagoon

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Environmental Engineering in CE
Which of the following is the most lethal water pollutant?

Suspended solids
Alkalis
Chlorine
Phenol and cynide

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Environmental Engineering in CE
Turbidity of water is an indication of the presence of

Suspended inorganic matter
Floating solids
Dissolved gases
Dissolved solids

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

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Environmental Engineering in CE
The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).

1500
750
230
20

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Environmental Engineering in CE
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.

10⁹
10¹⁵
10²
10⁵

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