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

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

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Environmental Engineering
In lime-soda process

Only carbonate hardness is removed
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

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