Civil Engineering - UPSC Civil Service Exam Questions - Discussion

32. 

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

Answer: Option C

Explanation:

No answer description available for this question.

Tarun said: (Nov 2, 2015)  
How? Please solve.

Bharath said: (May 26, 2017)  
The formula goes like this,

0.0673D^2.
And D = 40km,
Hence 0.0673 * 40^2 = 107.68.

Prasad said: (May 26, 2017)  
0.0673 x D^2.
0.0673 x 40^2.
107.68.

Ushakiran said: (Nov 25, 2017)  
I don't know how you get .0673D^2?

Please explain.

Rachayya said: (Jan 6, 2018)  
0.0673D^2 is the combined correction for curvature and refraction in the survey.

Diwkar said: (Aug 29, 2021)  
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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