Environmental Engineering
Which of the following unit works in anaerobic conditions?

Sludge digestion tank
Trickling filters
Activated sludge treatment
Sedimentation tank

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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

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

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

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