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

Plumb point
Nadir
Isocenter
Principal point

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

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Surveying
Which of the following methods of theodolite traversing is suitable for locating the details which are far away from transit stations?

Measuring angles to the point from at least two stations
Measuring angle at one station and distance from other
Measuring distance from two points on traverse line
Measuring angle and distance from one transit station

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