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UPSC Civil Service Exam Questions

Q1: In photogrammetric surveying, the image of the top of the hill is 90 mm, from the principal point of the photograph. If the elevation of the top of the hill is 500 m and the flying height is 5000 m above datum, then the relief displacement is

A 0.9 mm

B 9 mm

C 90 mm

D 900 mm

ANS:B - 9 mm

Relief displacement (d) = rh/H.
r = 90 mm.
H = 5000000 mm.
h = 500000 mm.
d= ( 90 x 500000 )/5000000
Ans is = 9 mm.



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