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UPSC Civil Service Exam Questions

Q1: How high should a helicopter pilot rise at a point. A just to see the horizon at point B, if the distance AB is 40 km ?

A 101.75 m

B 110.50 m

C 107.75 m

D 105.50 m

ANS:C - 107.75 m

Curvature correction = d^2/2r,
Refraction correction = d^2/14r,
Combined correction = cc+rc,
= -d^2/2r+d^2/14r.
= 0.0673d^2.



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