Surveying
If the image of a triangulation station of R.L. 500 m is 4 cm from the principal point of a vertical photo taken from an altitude of 2000 m, above datum, the height displacement will be

2 mm
4 mm
10 mm
6 mm

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the three angles of a plane triangle should be 180°
The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the angles around a station should be 360°
All listed here

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Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

taking both face observations and taking the mean of the two
taking mean of several readings distributed over different portions of the graduated circle
double sighting
reading both verniers and taking the mean of the two

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