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

4 mm
10 mm
2 mm
6 mm

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Surveying
Pick up the correct statement for horizontal photographs.

Parallel lines do not appear parallel in central projection
All listed here
The lines parallel to the negative plane are projected as parallel lines
The two sides of a road meet at the vanishing point

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