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Environmental Engineering

Environmental Engineering
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is

100
Zero
1
Infinite

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Environmental Engineering
Orthotolidine test is used for determination of

Dissolved oxygen
Residual chlorine
Dose of coagulant
Biochemical oxygen demand

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Environmental Engineering
Settling velocity increases with

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

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Environmental Engineering
The detention period for oxidation ponds is usually kept as

3 months
10 to 15 days
24 hours
48 hours

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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

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

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Environmental Engineering
Turbidity is measured on

Standard silica scale
Platinum cobalt scale
Standard platinum scale
Standard cobalt scale

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MORE MCQ ON Environmental Engineering

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