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
2 mm
10 mm
6 mm

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Surveying
Contour interval is

Larger for accurate works
Directly proportional to the flatness of ground
Inversely proportional to the scale of the map
Larger if the time available is more

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