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.

92

80

84

88

92

80

84

88

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

Aerobic oxidation

Neither A nor B

Using the activities of bacteria and other micro organisms

Both A & B

Aerobic oxidation

Neither A nor B

Using the activities of bacteria and other micro organisms

Both A & B

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Environmental Engineering in CE
Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.

100

400

4000

1000

100

400

4000

1000

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Environmental Engineering in CE
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

Ionosphere

Troposphere

Stratosphere

None of these

Ionosphere

Troposphere

Stratosphere

None of these

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Environmental Engineering in CE
Smoke is produced due to

Insufficient supply of combustion air and insufficient time for combustion

Poor design & overloading of furnace

Poor quality of fuel and improper mixing of fuel & combustion air

All of these

Insufficient supply of combustion air and insufficient time for combustion

Poor design & overloading of furnace

Poor quality of fuel and improper mixing of fuel & combustion air

All of these

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Environmental Engineering in CE
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

(i) and (iv)

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

(i) and (iv)

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Environmental Engineering in CE

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

Environmental Engineering in CE Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.

Environmental Engineering in CE The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

Environmental Engineering in CE Smoke is produced due to

Environmental Engineering in CE As compared to rapid sand filters, slow sand filters give(i) Slower filtration rate(ii) Higher filtration rate(iii) Lesser efficiency in removal of bacteria(iv) Higher efficiency in removal of bacteriaThe correct answer is

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

Environmental Engineering in CE
Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.

Environmental Engineering in CE
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

Environmental Engineering in CE
Smoke is produced due to

Environmental Engineering in CE
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is