There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

Environmental Engineering in CE
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

1

0.05

6.5

15

1

0.05

6.5

15

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Environmental Engineering in CE
The resistance of water to the passage of light through it is a measure of the

Hardness

Dissolved gases

Turbidity

Color

Hardness

Dissolved gases

Turbidity

Color

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Environmental Engineering in CE
A shallow pond in which the sewage is retained and biologically treated is called

Imhoff tank

Lagoon

Skimming tank

Oxidation

Imhoff tank

Lagoon

Skimming tank

Oxidation

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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

Coagulation and flocculation of colloids

Oxidation of carbonaceous matter to CO₂

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

All of these

Coagulation and flocculation of colloids

Oxidation of carbonaceous matter to CO₂

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

All 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

Oxygen ion concentration

Bacterial stability factor

Biological oxygen demand (BOD)

Relative stability

Oxygen ion concentration

Bacterial stability factor

Biological oxygen demand (BOD)

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Environmental Engineering in CE
The permissible color for domestic water supply is __________ ppm.

100

1

1000

20

100

1

1000

20

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Environmental Engineering in CE

Environmental Engineering in CE The resistance of water to the passage of light through it is a measure of the

Environmental Engineering in CE A shallow pond in which the sewage is retained and biologically treated is called

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 ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Environmental Engineering in CE The permissible color for domestic water supply is __________ ppm.

Environmental Engineering in CE
The resistance of water to the passage of light through it is a measure of the

Environmental Engineering in CE
A shallow pond in which the sewage is retained and biologically treated is called

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 ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Environmental Engineering in CE
The permissible color for domestic water supply is __________ ppm.