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Environmental Engineering

Environmental Engineering
Orthotolidine test is used for determination of

Dose of coagulant
Biochemical oxygen demand
Residual chlorine
Dissolved oxygen

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Environmental Engineering
A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called

Sub-main sewer
Lateral sewer
Main sewer
House sewer

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Environmental Engineering
As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is

(i) and (ii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)

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Environmental Engineering
The suitable method for disinfection of swimming pool water is

Ultra violet rays treatment
By using potassium permanganate
Chlorination
Lime treatment

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Environmental Engineering
The velocity of flow does not depend on

Length of sewer
Hydraulic mean depth of sewer
Grade of sewer
Roughness of sewer

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Environmental Engineering
The rate of filtration in slow sand filters in million litres per day per hectare is about

50 to 60
100 to 150
1400 to 1500
500 to 600

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