Surveying
Check lines (or proof lines) in Chain Surveying, are essentially required

To increase the out-turn
To plot the chain lines
To plot the offsets
To indicate the accuracy of the survey work

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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 non-parallelism of the axis of telescope level and line of collimation
error due to horizontal axis not being perpendicular to the vertical axis

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