Download Aptitude Crack
img not found img not found

UPSC Civil Service Exam Questions - Engineering

Q1:

Which of the following are associated with alum coagulation ?
1. A decrease of alkalinity in treated water
2. Formation of hydroxide flocs of aluminium
3. A slight decrease of pH in treated water
4. An increase of permanent hardness
Select the correct answer using the codes given below :

A 1, 2 and 3

B 1, 3 and 4

C 1, 2, 3 and 4

D 2 and 4

ANS:C - 1, 2, 3 and 4

No answer description is available.