Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Environmental Engineering in CE
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Diluted with fresh water to reduce its acidity

None of these

Neutralised by alkali treatment

Left as such without any treatment

Diluted with fresh water to reduce its acidity

None of these

Neutralised by alkali treatment

Left as such without any treatment

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Environmental Engineering in CE
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because

It forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen

It forms CO₂ by combining with oxygen present in the blood

Of jamming of respiratory tract

Of clotting of blood

It forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen

It forms CO₂ by combining with oxygen present in the blood

Of jamming of respiratory tract

Of clotting of blood

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Environmental Engineering in CE
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?

Cruising

Acceleration

Deaccelaration

Idle running

Cruising

Acceleration

Deaccelaration

Idle running

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Environmental Engineering in CE
Which of the following is the most detrimental for water used in high pressure boiler?

Phenol

Dissolved oxygen

Silica

Turbidity

Phenol

Dissolved oxygen

Silica

Turbidity

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Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

None of these

Ozone

Hydrogen

Carbon dioxide

None of these

Ozone

Hydrogen

Carbon dioxide

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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.

80

92

84

88

80

92

84

88

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Environmental Engineering in CE

Environmental Engineering in CE Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Environmental Engineering in CE On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because

Environmental Engineering in CE During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?

Environmental Engineering in CE Which of the following is the most detrimental for water used in high pressure boiler?

Environmental Engineering in CE A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

Environmental Engineering in CE
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Environmental Engineering in CE
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because

Environmental Engineering in CE
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?

Environmental Engineering in CE
Which of the following is the most detrimental for water used in high pressure boiler?

Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.