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UPSC Civil Service Exam Questions - Engineering

Q1:

A person of height 1.65 m standing on a cliff of height 20 m above the water level on sea-shore can sight a ship at a distance of about

A 10 km

B 18 km

C 30 km

D 40 km

ANS:B - 18 km

Use Distance=3.855 √(h);
h = 20+1.65.