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Environmental Engineering in CE

Environmental Engineering in CE
Which is the most practical and economical method for removal of suspended solid matter from polluted water?

Skimming off
Biological oxidation
Sedimentation
Chlorination

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Environmental Engineering in CE
Tolerable limit of nitrogen oxides in air is __________ ppm.

25
1
5
0.1

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Environmental Engineering in CE
What are the methods of treatment & disposal of radioactive wastes?

Evaporation & chemical precipitation
Biological methods & adsorption in ion exchange materials
All of these
Fixing into a solid mass with cement and sinking deep in the sea

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Environmental Engineering in CE
When the concentration of SO₂ in air is greater than __________ ppm, it gives a pungent smell.

1
0.01
4
0.1

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

20
750
1500
230

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Environmental Engineering in CE
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

0.1
100
25
1000

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MORE MCQ ON Environmental Engineering in CE

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