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

Scour valve
Check valve
Safety valve
Sluice 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 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
A is true but R is false

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Environmental Engineering
The polluted water is one which

Is safe and suitable for drinking and domestic use
Contains pathogenic bacteria
Consists of undesirable substances rendering it unfit for drinking and domestic use
Is contaminated

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