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

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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

Left as such without any treatment
Neutralised by alkali treatment
None of these
Diluted with fresh water to reduce its acidity

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

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

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