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Environmental Engineering

Environmental Engineering
Period of cleaning of slow sand filters is about

2 - 3 months
1 - 2 year
24 - 48 hours
10 - 12 days

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Environmental Engineering
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

BOD > COD > TOD
COD > BOD > TOD
TOD > COD > BOD
TOD > BOD > COD

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Environmental Engineering
As compared to geometrical increase method of forecasting population, arithmetical increase method gives

Same value
Accurate value
Lesser value
Higher value

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Environmental Engineering
Chlorine demand of water is equal to

Sum of applied and residual chlorine
Residual chlorine
Difference of applied and residual chlorine
Applied chlorine

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Environmental Engineering
The settling velocity of a particle in a sedimentation tank depends on

None of these
Surface area of tank
Both depth and surface area of tank
Depth of tank

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Environmental Engineering
The depression of water table in a well due to pumping will be maximum(Where ‘R’ is the radius of influence)

Close to the well
At a distance R from the well
None of these
At a distance R/2 from the well

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