Surveying
The flying height of the camera is 1,000 m above mean ground level, the distance of the top of a building from a nadir point is 10 cm and the relief displacement of building is 7.2 mm. The height of the building, is

72 m
52 m
82 m
62 m

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Surveying
Dumpy level is most suitable when

the instrument is to be shifted frequently
fly levelling is being done over long distance
All of these
many readings are to be taken from a single setting of the instrument

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