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

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Environmental Engineering
Sludge volume index is defined as the ratio of

Percentage of sludge by volume to percentage of total solids by weight
Percentage of total solids by weight to percentage of sludge by volume
Percentage of suspended solids by weight to percentage of sludge by volume
Percentage of sludge by volume to percentage of suspended solids by weight

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