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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

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

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Environmental Engineering
The alum, when added as a coagulant in water

Does not affect pH value of water
Decreases pH value of water
Does not require alkalinity in water for flocculation
Increases pH value of water

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Environmental Engineering
Activated carbon is used for

Removing hardness
Disinfection
Removing corrosiveness
Removing odours

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Environmental Engineering
The velocity of flow of water in a sedimentation tank is about

15 to 30 cm/sec
15 to 30 cm/hour
15 to 30 cm/minute
5 to 10 cm/sec

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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
Reflux valve
Air relief valve
Pressure relief valve

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Environmental Engineering
Which of the following unit works in anaerobic conditions?

Activated sludge treatment
Trickling filters
Sedimentation tank
Sludge digestion tank

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MORE MCQ ON Environmental Engineering

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