Surveying
Polaris is usually observed for the determination of the azimuth when it is

At elongation
At culmination
Either at culmination or at elongation
Neither at culmination nor at elongation

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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
For a line AB

none is correct
the forebearing of AB and back bearing of AB differ by 180°
both (A) and (B) are correct
the forebearing of AB and back bearing of BA differ by 180°

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