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Environmental Engineering in CE

Environmental Engineering in CE
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

Highly
Moderately
Very extremely
Extremely

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Environmental Engineering in CE
Which of the following pollutants is not emitted during volcanic eruptions?

CO
SO₂
H₂S
Hydrocarbons

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Environmental Engineering in CE
TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes

Skin disorder
Cancer
Bone disease
Bronchitis

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Environmental Engineering in CE
Beyond what concentration of H₂S in air, acute danger to human life exists?

50 ppm
700 ppm
300 ppm
100 ppm

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Environmental Engineering in CE
COD of raw municipal sewage may be in the range of about __________ mg/litre.

1-2
1500-2500
90-120
5-10

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Environmental Engineering in CE
Which of the following is an adsorbant used for the removal of SO₂ from gas/air?

Silica gel
Bog iron
Limestone powder or alkalised alumina
Active carbon

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