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

Plumb point
Principal point
Perspective centre
Isocenter

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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 QB of a line and WCB of a line
both give WCB of a line
both give QB of a line

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Surveying
Spring tides are caused when

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

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to line of collimation not being perpendicular to horizontal axis
error due to imperfect adjustment of plate levels
error due to imperfect graduations
error due to eccentricity of verniers

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