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:

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
A is false but R is true

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Environmental Engineering
Scour valves are provided

At every summit of rising mains
At street corners to control the flow of water
At every depression and dead ends to drain out the waste water that may collect there
At the foot of rising main along the slope to prevent back running of water

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Environmental Engineering
In lime-soda process

Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness
Only noncarbonated hardness is removed
Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness
Only carbonate hardness is removed

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