Surveying
The orthogonal projection of the perspective centre on a tilted photograph, is called

Nadir
Principal point
Plumb point
Isocenter

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

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