Chemical Environmental Engineering

Smog is ______________________?

A. Nothing but black smoke
B. A combination of smoke and fog
C. A liquid particle resulting from vapor condensation
D. A solid particle e.g. fly-ash

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Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about ______________ ppm?

A. < 1
B. 10-100
C. 100-200
D. 100-1000

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For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?

A. 10000
B. 5
C. 500
D. 1000

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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 ?

A. CO
B. SO2
C. NOx
D. CFC (chloro fluoro carbons)

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The term Biological Oxygen Demand (BOD) is used in relation to ______________________?

A. Potable water
B. Cooling water
C. Distilled water
D. Industrial effluents

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The upper layer of atmosphere is called the ____________________?

A. Stratosphere
B. Troposphere
C. Ionosphere
D. None of these

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CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?

A. 102
B. 105
C. 109
D. 1015

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The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?

A. 20
B. 230
C. 750
D. 1500

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Chemical Environmental Engineering

Smog is ______________________?

Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about ______________ ppm?

For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?

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 ?

The term Biological Oxygen Demand (BOD) is used in relation to ______________________?

The upper layer of atmosphere is called the ____________________?

CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?

The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?

Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?

Disinfection of water is done to remove ______________________?