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Environmental Engineering

Environmental Engineering
The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of

1 mg/liter
1000 mg/liter
10 mg/liter
100 mg/liter

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Environmental Engineering
The rate of filtration in slow sand filters in million litres per day per hectare is about

1400 to 1500
50 to 60
100 to 150
500 to 600

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Environmental Engineering
Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the

Residual chlorine in water
Turbidity in water
Hardness in water
Dissolved oxygen in water

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Environmental Engineering
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

0.05 to 0.5 ppm
0.5 to 1.0 ppm
0.01 to 0.05 ppm
1.0 to 5.0 ppm

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Environmental Engineering
Sewage treatment units are normally designed for

15 - 20 years
28 - 30 years
5 - 10 years
15 - 28 years

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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

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

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