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 horizontal axis not being perpendicular to the vertical axis
None of these
error due to non-parallelism of the axis of telescope level and line of collimation

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Surveying
Theodolite is an instrument used for

measurement of both horizontal and vertical angles
measurement of vertical angles only
measurement of horizontal angles only
tightening the capstan-headed nuts of level tube

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