Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.

Environmental Engineering in CE
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.

88

80

92

84

88

80

92

84

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Environmental Engineering in CE
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.

9 to 10

4 to 5

1 to 2

15 to 20

9 to 10

4 to 5

1 to 2

15 to 20

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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

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

All of these

Oxidation of carbonaceous matter to CO₂

Coagulation and flocculation of colloids

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Environmental Engineering in CE
In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

t = 0.0035h -15

t = 15 - 0.0065h

t = 15 - 0.0035h

t = 15 + 0.0065h

t = 0.0035h -15

t = 15 - 0.0065h

t = 15 - 0.0035h

t = 15 + 0.0065h

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Environmental Engineering in CE
In sewage treatment, its sedimentation is speeded up by commonly adding

Hydrochloric acid

Sodium sulphate

Copper sulphate

Lime

Hydrochloric acid

Sodium sulphate

Copper sulphate

Lime

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Environmental Engineering in CE
Removal of __________ results from the disinfection of water.

Hardness

Odour

Turbidity

Bacteria

Hardness

Odour

Turbidity

Bacteria

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Environmental Engineering in CE

Environmental Engineering in CE In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.

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 In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

Environmental Engineering in CE In sewage treatment, its sedimentation is speeded up by commonly adding

Environmental Engineering in CE Removal of __________ results from the disinfection of water.

Environmental Engineering in CE
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.

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
In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

Environmental Engineering in CE
In sewage treatment, its sedimentation is speeded up by commonly adding

Environmental Engineering in CE
Removal of __________ results from the disinfection of water.