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 true but R is false
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 false but R is true

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Environmental Engineering
Sludge volume index is defined as the ratio of

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

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