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Environmental Engineering

Environmental Engineering
Activated carbon is used for

Disinfection
Removing hardness
Removing corrosiveness
Removing odours

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Environmental Engineering
As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is

None of these
Larger
Smaller
Same

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Environmental Engineering
The characteristics of fresh and septic sewage respectively are

Alkaline and acidic
Both acidic
Both alkaline
Acidic and alkaline

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Environmental Engineering
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is

Sluice valve
Pressure relief valve
Air relief valve
Reflux valve

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Environmental Engineering
The maximum discharge of a tube well is about

500 liters/sec
5 liters/sec
50 liters/sec
1000 liters/sec

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

Remains unaffected
Increases
Decreases
None of these

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