UPSC Civil Service Exam Questions - Civil Engineering Questions and Answers

Home / Civil Engineering / UPSC Civil Service Exam Questions :: Discussion

Discussion :: UPSC Civil Service Exam Questions

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 ?

1 and 3

2 and 4

2 and 3

1 and 2

View Answer