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

None of these
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
error due to non-parallelism of the axis of telescope level and line of collimation

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Surveying
The rise and fall method

quicker and less tedious for large number of intermediate sights
provides a check on the reduction of intermediate point levels
is less accurate than height of instrument method
is not suitable for levelling with tilting levels

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