Environmental Engineering
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is

Safety valve
Scour valve
Sluice valve
Check valve

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Environmental Engineering
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.Reason R: The sand used in slow sand filters is finer than that in rapid sand filtersSelect your answer based on the coding system given below:

A is true but R is false
A is false but R is true
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A

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