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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).

7
1
20
3

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Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

Hydrogen
None of these
Carbon dioxide
Ozone

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Environmental Engineering in CE
Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage?

Hydrogen fluoride & nitrogen oxides
Smog & ozone
Carbon monoxide
Sulphur dioxide & spray of weed killers

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Environmental Engineering in CE
Radioactive substances present in the polluted water stream can be removed by

Biological oxygen treatment
Adsorption in ion exchange materials
None of these
Coagulation and filtration

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Environmental Engineering in CE
Algae growth in water is controlled by

Deoxidation
Chlorination
Bleaching
Aeration

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Environmental Engineering in CE
Hydrogen ion concentration in distilled water is

7 x 10⁷
10⁻⁷
10⁷
7 x 10⁻⁷

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