Surveying
Accidental errors

Do not follow any definite mathematical law
All of these
Are generally small
Cannot be removed by applying corrections to the observed values

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

None of these
error due to horizontal axis not being perpendicular to the vertical axis
index error i.e. error due to imperfect adjustment of the vertical circle vernier
error due to non-parallelism of the axis of telescope level and line of collimation

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