Surveying
A Nautical mile is

1855.109 m
One minute arc of the great circle passing through two points
All of these
One minute arc of the longitude

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Surveying
Homologous points are

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

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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
None of these
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

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