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Environmental Engineering

Environmental Engineering
Residual chlorine in water is determined by

Starch iodide method
Orthotolidine method
Both (A) and (B)
None of these

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Environmental Engineering
The distribution mains are designed for

Maximum hourly demand on maximum day
Maximum hourly demand
Maximum daily demand
Average daily demand

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Environmental Engineering
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is

Copper
Cast iron
Reinforced cement concrete
Steel

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Environmental Engineering
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is

Air relief valve
Reflux valve
Pressure relief valve
Sluice valve

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Environmental Engineering
Alum as a coagulant is found to be most effective when pH range of water is

6 to 8
4 to 6
2 to 4
8 to 10

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Environmental Engineering
In water treatment, rapid gravity filters are adopted to remove

Dissolved solids and dissolved gases
Bacteria and colloidal solids
Floating solids and dissolved inorganic solids
Dissolved organic substances

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