Surveying
A ’level line’ is a

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
line passing through the objective lens and the eye-piece of a dumpy or tilting level

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Surveying
If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated

on its outer spindle with a relative motion between the vernier and graduated scale of lower plate
on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate
on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate
on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate

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Surveying
For a line AB

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°
none is correct

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