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UPSC Civil Service Exam Questions - Engineering

Q1:

If a descending gradient of 1 in 25 meets an ascending gradient of 1 in 40, then the length of valley curve required for a headlight sight distance of 100 m will be

A 30 m

B 130 m

C 310 m

D 630 m

ANS:B - 130 m

L = NS^2/(1.5 + 0.035S).
B is the answer.