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Environmental Engineering in CE

Environmental Engineering in CE
Most of the atmospheric air pollutants are present in large quantity in

Trophosphere
Stratosphere
Mesosphere
Thermosphere

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Environmental Engineering in CE
Which of the following is not a natural source of air pollution?

Photochemical oxidation of organic matter
Volcanic eruptions and lightening discharges
Biological decay of vegetable matter
None of these

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Environmental Engineering in CE
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Relative stability
Bacterial stability factor
Oxygen ion concentration
Biological oxygen demand (BOD)

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Environmental Engineering in CE
Biological oxidation ponds remove organic matters present in the polluted water by

Aerobic oxidation
Using the activities of bacteria and other micro organisms
Both A & B
Neither A nor B

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Environmental Engineering in CE
Green house effect is accentuated by

Deforestation
Rapid industrialisation
Increased transportation activity
All of these

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Environmental Engineering in CE
Dissolved oxygen content in river water is around __________ ppm.

500
100
5
250

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