Surveying
A star is said to elongate

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

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Surveying
Accidental errors

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

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Surveying
The cross hairs in the surveying telescope are placed

midway between eye piece and objec-tive lens
anywhere between eye-piece and objective lens
much closer to the objective lens than to the eye piece
much closer to the eye-piece than to the objective lens

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