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Environmental Engineering

Environmental Engineering
The minimum and maximum diameters of sewers shall preferably be

15 cm and 300 cm
30 cm and 450 cm
60 cm and 300 cm
15 cm and 100 cm

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Environmental Engineering
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is

40 ppm
10 ppm
4 ppm
1 ppm

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Environmental Engineering
The effect of increasing diameter of sewer on the self cleansing velocity is

Nil
To increase it
To decrease it
Fluctuating

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Environmental Engineering
In chlorination, with the rise in temperature of water, death rate of bacteria

None of these
Increases
Remains unaffected
Decreases

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Environmental Engineering
The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is

9800
10100
9500
10920

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Environmental Engineering
The characteristics of fresh and septic sewage respectively are

Both acidic
Acidic and alkaline
Both alkaline
Alkaline and acidic

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