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 length of a chain is measured from

centre of one handle to centre of other handle
outside of one handle to inside of other handle
inside of one handle to inside of other handle
outside of one handle to outside of other handle

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to eccentricity of verniers
error due to wrong adjustment of line of collimation and trunnion axis
error due to inaccurate graduation
error due to displacement of station signals

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