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Environmental Engineering

Environmental Engineering
Laying of sewers is usually done with the help of

A Theodolite
A compass
A plane table
Sight rails and boning rods

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Environmental Engineering
Standard BOD is measured at

30°C - 5 day
20°C - 1 day
25°C - 3 day
20°C - 5 day

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Environmental Engineering
Which of the following retards the self purification of stream?

Satisfying oxygen demand
Higher temperature
Sunlight
None of these

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Environmental Engineering
The slope of sewer shall be

Given in the direction of natural slope of ground
Steeper than 1 in 20
Given in the direction opposite to natural slope of ground
Zero

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

10 to 15 days
3 months
24 hours
48 hours

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Environmental Engineering
The chemical most commonly used to increase speed of sedimentation of sewage is

Lime
Sodium permanganate
Copper sulphate
Sulphuric acid

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