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Waste Water Engineering

Waste Water Engineering
In a sludge tank, the gas mainly produced, is

Carbon dioxide
Oxygen
Nitrogen
Hydrogen

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Waste Water Engineering
Depletion of ozone layer in the outer atmosphere may cause

Skin cancer
Lung cancer
Bronchitis
Heart disorder

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Waste Water Engineering
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Hydrogen sulphide
Carbon dioxide
Methane
Oxygen

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Waste Water Engineering
Maximum permissible velocity 1.5 m/sec, is adopted in drains

Lined with stones
Neither A. nor B.
Both A. and B.
With beds of rocks and gravels

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Waste Water Engineering
In 1000 kg of sewage, the total solids approximate

1 kg to 2.0 kg
5 kg to 7.5 kg
7.5 kg to 10 kg
0.5 to 1.0 kg

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Waste Water Engineering
The rate of accumulation of sludge in septic tanks is recommended as

25 litres/person/month
30 litres/person/month
25 litres/person/year
30 litres/person/year

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