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

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Environmental Engineering
The polluted water is one which

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

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