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.

84

80

88

92

84

80

88

92

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Environmental Engineering in CE
Peroxyacyl nitrate (PAN), a pollutant is found in the

Exhaust of nitric acid plant

Automobile exhaust

Exhaust of sulphuric acid plant

Flue gas of coal based power plant

Exhaust of nitric acid plant

Automobile exhaust

Exhaust of sulphuric acid plant

Flue gas of coal based power plant

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Environmental Engineering in CE
The amount of coagulant needed for coagulation of water increases with(i) Increase in turbidity of water(ii) Decrease in turbidity of water(iii) Increase in temperature of water(iv) Decrease in temperature of waterThe correct answer is

(i)and(iv)

(ii) and (iii)

(i) and (ii)

(ii) and (iv)

(i)and(iv)

(ii) and (iii)

(i) and (ii)

(ii) and (iv)

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Environmental Engineering in CE
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.

140

120

200

170

140

120

200

170

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Environmental Engineering in CE
Aerobic biological oxidation ponds used for the purification of polluted water

Destroys/removes pathogen much more effectively if the sewage is chlorinated

Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents

All of these

Destroys/removes pathogen from the sewage

Destroys/removes pathogen much more effectively if the sewage is chlorinated

Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents

All of these

Destroys/removes pathogen from the sewage

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Environmental Engineering in CE
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

105

95

75

35

105

95

75

35

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Environmental Engineering in CE

Environmental Engineering in CE Peroxyacyl nitrate (PAN), a pollutant is found in the

Environmental Engineering in CE The amount of coagulant needed for coagulation of water increases with(i) Increase in turbidity of water(ii) Decrease in turbidity of water(iii) Increase in temperature of water(iv) Decrease in temperature of waterThe correct answer is

Environmental Engineering in CE Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.

Environmental Engineering in CE Aerobic biological oxidation ponds used for the purification of polluted water

Environmental Engineering in CE Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

Environmental Engineering in CE
Peroxyacyl nitrate (PAN), a pollutant is found in the

Environmental Engineering in CE
The amount of coagulant needed for coagulation of water increases with(i) Increase in turbidity of water(ii) Decrease in turbidity of water(iii) Increase in temperature of water(iv) Decrease in temperature of waterThe correct answer is

Environmental Engineering in CE
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.

Environmental Engineering in CE
Aerobic biological oxidation ponds used for the purification of polluted water

Environmental Engineering in CE
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.