Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

Environmental Engineering in CE
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

CFC (chloro fluoro carbons)

CO

SO₂

NOx

CFC (chloro fluoro carbons)

CO

SO₂

NOx

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Environmental Engineering in CE
Which of the following acts as a natural source of air pollution?

None of these

Volcanic eruption

Forest fire

Deforestation

None of these

Volcanic eruption

Forest fire

Deforestation

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Environmental Engineering in CE
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

Both A & B

Photosynthetic action of algae

Neither A nor B

Natural aeration of water stream

Both A & B

Photosynthetic action of algae

Neither A nor B

Natural aeration of water stream

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Environmental Engineering in CE
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.

Hydrocarbon fuel

Low amount of excess combustion air

Large quantity of excess combustion air

Pulverised coal as fuel

Hydrocarbon fuel

Low amount of excess combustion air

Large quantity of excess combustion air

Pulverised coal as fuel

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Environmental Engineering in CE
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

All of these

Oxidation of carbonaceous matter to CO₂

Coagulation and flocculation of colloids

Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate

All of these

Oxidation of carbonaceous matter to CO₂

Coagulation and flocculation of colloids

Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate

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Environmental Engineering in CE
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Pipe vibrations

Boundary layer separation

Fluctuation in liquid flow

Cavitation

Pipe vibrations

Boundary layer separation

Fluctuation in liquid flow

Cavitation

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Environmental Engineering in CE

Environmental Engineering in CE Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

Environmental Engineering in CE Which of the following acts as a natural source of air pollution?

Environmental Engineering in CE Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

Environmental Engineering in CE Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.

Environmental Engineering in CE Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

Environmental Engineering in CE The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Environmental Engineering in CE
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

Environmental Engineering in CE
Which of the following acts as a natural source of air pollution?

Environmental Engineering in CE
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

Environmental Engineering in CE
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.

Environmental Engineering in CE
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

Environmental Engineering in CE
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is