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

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

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Surveying
A ’level line’ is a

line passing through the objective lens and the eye-piece of a dumpy or tilting level
line parallel to the mean spheriodal surface of earth
line passing through the center of cross hairs and the center of eye piece
horizontal line

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