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

84

92

80

88

84

92

80

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Environmental Engineering in CE
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes

Irritation in eyes

All of these

Poor visibility due to sky darkening

Respiratory trouble

Irritation in eyes

All of these

Poor visibility due to sky darkening

Respiratory trouble

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Environmental Engineering in CE
Smog is not formed due to the presence of __________ in the atmosphere.

NOx

Any of these

SO₂

CO₂

NOx

Any of these

SO₂

CO₂

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Environmental Engineering in CE
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

43961

43832

15-20

25-30

43961

43832

15-20

25-30

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Environmental Engineering in CE
Turbidity of water is an indication of the presence of

Suspended inorganic matter

Dissolved solids

Floating solids

Dissolved gases

Suspended inorganic matter

Dissolved solids

Floating solids

Dissolved gases

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Environmental Engineering in CE
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.

Decreases

Remains constant

May increase or decrease ; depends on the chemical characteristics of polluted water

Increases

Decreases

Remains constant

May increase or decrease ; depends on the chemical characteristics of polluted water

Increases

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Environmental Engineering in CE

Environmental Engineering in CE Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes

Environmental Engineering in CE Smog is not formed due to the presence of __________ in the atmosphere.

Environmental Engineering in CE Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

Environmental Engineering in CE Turbidity of water is an indication of the presence of

Environmental Engineering in CE The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.

Environmental Engineering in CE
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes

Environmental Engineering in CE
Smog is not formed due to the presence of __________ in the atmosphere.

Environmental Engineering in CE
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

Environmental Engineering in CE
Turbidity of water is an indication of the presence of

Environmental Engineering in CE
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.