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

Isocenter
Plumb point
Perspective centre
Principal point

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Surveying
Spring tides are caused when

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

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