Surveying
The point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as

Perspective centre
Isocenter
Plumb point
Principal point

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Surveying
Spring tides are caused when

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

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Surveying
Refraction correction

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

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Surveying
The prismatic compass and surveyor’s compass

give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively
both give WCB of a line
both give QB of a line
both give QB of a line and WCB of a line

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