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
horizontal line
line passing through the center of cross hairs and the center of eye piece

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Surveying
In the prismatic compass

the magnetic needle moves with the box
the magnetic needle and graduated circle do not move with the box
the line of the sight does not move with the box
the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction

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Surveying
Spring tides are caused when

None of these
Solar tidal force acts opposite to lunar tidal force
Solar tidal force and lunar tidal force both coincide
Sun and moon are in line with earth

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Surveying
Refraction correction

completely eliminates curvature correction
has no effect on curvature correction
partially eliminates curvature correction
adds to the curvature correction

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