Surveying
In the quadrantal bearing system, a whole circle bearing of 293° 30′ can be expressed as

S113°30’N
W23°30’N
N66°30’W
N23°30’W

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

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

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