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)

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP

Environmental Engineering
Assertion A: The consumption of water increases with increase in the distribution pressure.Reason R: Higher distribution pressure causes more loss and waste of waterSelect your answer according to 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
A is true but R is false
Both A and R is true but R is not the correct explanation of A

ANSWER DOWNLOAD EXAMIANS APP

Environmental Engineering
Sludge volume index is defined as the ratio of

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

ANSWER DOWNLOAD EXAMIANS APP