Surveying
In a truly vertical photograph,

Plumb point coincides the principal point
All listed here
Iso-centre coincides the plumb point
Principal point coincides the isocenter

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Surveying
The rise and fall method

provides a check on the reduction of intermediate point levels
is not suitable for levelling with tilting levels
quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of the three angles is equal to two right angles
Sum of any two sides is greater than the third
Sum of the three angles less than six right angles and greater than two right angles
Every angle is less than two right angles

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