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

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

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