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UPSC Civil Service Exam Questions - Engineering

Q1:

In a trigonometric levelling, the height of the signal used is 4.62 m and the instrument height is 1.25 m. If the horizontal distance of the target from the instrument is 5780 m, then the axis-signal correction is

A
seconds

B
seconds

C
seconds

D
seconds

ANS:D -

seconds

Axis angle correction = (s2 - h1) / (D sin 1") = (s2 - h1) * 206265/ D.

A is the correct answer.