Surveying
Refraction correction

has no effect on curvature correction
partially eliminates curvature correction
adds to the curvature correction
completely eliminates curvature correction

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

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

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