Surveying
A star is said to elongate

All of these
When the star momentarily moves vertically
When the star
When the angle at the star of the spherical triangle is 90°

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

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

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