Surveying
The longitudes of two places at latitude 60° N are 93° E and 97° W. Their departure is

5100 nautical miles
120 nautical miles
5700 nautical miles
500 nautical miles

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Surveying
The cross hairs in the surveying telescope are placed

anywhere between eye-piece and objective lens
much closer to the objective lens than to the eye piece
much closer to the eye-piece than to the objective lens
midway between eye piece and objec-tive lens

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

error due to non-parallelism of the axis of telescope level and line of collimation
None of these
index error i.e. error due to imperfect adjustment of the vertical circle vernier
error due to horizontal axis not being perpendicular to the vertical axis

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