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UPSC Civil Service Exam Questions

Q1: In the preliminary treatment of wastewater, skimming tanks are often included in the treatment scheme. Various features of skimming tanks are that these :
1. can remove general floating matter.
2. can remove oily and greasy matter.
3. have detention time of 30 min.
4. employ compressed air blown through diffusers.
Which of these statements are correct ?

A 1 and 3

B 2 and 4

C 2 and 3

D 1 and 2

ANS:B - 2 and 4

No answer description is available.



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