Environmental Engineering
The major disadvantage of lime soda process of water softening is that

It is unsuitable for softening the water of excessive hardness
Huge amount of precipitate is formed which creates a disposal problem
It is unsuitable for turbid and acidic water
The effluent cannot be reduced to zero hardness

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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
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 true but R is false

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