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UPSC Civil Service Exam Questions - Engineering

Q1:

A lighthouse is visible just above the horizon at a certain station at the sea level. The distance between the station and the lighthouse is 40 km. The height of the lighthouse is approximately

A 187 m

B 137.7 m

C 107.7 m

D 87.3 m

ANS:C - 107.7 m

The Combined correction for refraction and curvature = 0.0673D^2.
= 0.0673(40)^2.
H = 107.68m.