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UPSC Civil Service Exam Questions - Engineering

Q1:

The upstream slope of an earth dam under steady seepage condition is

A equipotential line

B phreaticline

C flow-line

D seepage line

ANS:A - equipotential line

B is not correct because phreatic line is perpendicular to the slope of the upstream side of the dam. And equipotential lines are also perpendicular to the phreatic line.

So upstream slop represents an equipotential line. Hence A is the correct answer.