Surveying - Civil Engineering Questions and Answers

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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

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

none of the above

Answer : Option D

Explanation :

Explanation Not Provided

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