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UPSC Civil Service Exam Questions - Engineering

Q1:

If the line of sight between two stations A and B, on sea, and 80 km apart, makes tangent at point A, then the minimum elevation of the signal required at B (considering the coefficient of refraction "m" = 0.08 and the mean radius of earth as 6400 km) will be

A 42 m

B 210 m

C 420 m

D 840 m

ANS:C - 420 m

h = D2 x (1-2m)/2R.
= 80*80*(1-2 * 0.08)/2 * 6400.
= 0.42 km.
= 420mtr.