Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to wrong adjustment of line of collimation and trunnion axis
error due to inaccurate graduation
error due to displacement of station signals
error due to eccentricity of verniers

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

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
None of these

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Surveying
The length of a chain is measured from

centre of one handle to centre of other handle
inside of one handle to inside of other handle
outside of one handle to outside of other handle
outside of one handle to inside of other handle

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