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
index error i.e. error due to imperfect adjustment of the vertical circle vernier
None of these
error due to horizontal axis not being perpendicular to the vertical axis

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Surveying
Homologous points are

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

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Surveying
In triangulation surveys

Sides are not measured excepting the base line
The area is divided into triangular figures
All listed here
Control stations are located from which detailed surveys are carried out

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