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Environmental Engineering in CE

Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

3
20
1
7

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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.

10²
10⁹
10⁵
10¹⁵

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Environmental Engineering in CE
The principal gas evolved from sludge digestion tank is

CO₂
N₂
CH₄
CO

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Environmental Engineering in CE
Presence of high concentration of ozone and smog in atmospheric air causes the

Fading of dye on textiles
Cracking of rubber products
Embrittlement & decrease of folding resistance of paper
Damage of electrical insulator on high tension power line

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Environmental Engineering in CE
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.

100-1000
10-100
100-200

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Environmental Engineering in CE
The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the

Green house effect
Global warming
Both B and C
Catalytic conversion

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