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Environmental Engineering

Environmental Engineering
Settling velocity increases with

Temperature of liquid
Specific gravity of solid particles
Size of particles
Depth of tank

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

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

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Environmental Engineering
Disinfection of water results in

Removal of hardness
Killing of disease bacteria
Complete sterilisation
Removal of turbidity

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Environmental Engineering
Which of the following values of pH represents a stronger acid?

4
3
5
2

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Environmental Engineering
The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally

More and more
Less and less
More and less
Less and more

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Environmental Engineering
Disinfection efficiency is

Highest at pH value equal to 7
Unaffected by pH value of water
Reduced at higher pH value of water
Increased at higher pH value of water

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