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

error due to horizontal axis not being perpendicular to the vertical axis
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

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Surveying
Homologous points are

Corresponding points on the ground and photograph
Plumb points of stereo pair of photographs
Opposite corners of a photograph
Nodal points of the camera lens

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the eight angles of a braced quadrilateral should be 360°
All listed here
The sum of the angles around a station should be 360°
The sum of the three angles of a plane triangle should be 180°

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