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Environmental Engineering

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

Decreases
Remains unaffected
Increases
None of these

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

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

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Environmental Engineering
The process in which the chlorination is done beyond the break point is known as

Break point chlorination
Post chlorination
Pre-chlorination
Super chlorination

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Environmental Engineering
On standard silica scale, the turbidity in drinking water should be limited to

20 ppm
50 ppm
30 ppm
10 ppm

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Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

1,00,000
1000
4,00,000
4000

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Environmental Engineering
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is

Copper
Reinforced cement concrete
Cast iron
Steel

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