Surveying
The rise and fall method

quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method
is not suitable for levelling with tilting levels
provides a check on the reduction of intermediate point levels

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Surveying
The cross hairs in the surveying telescope are placed

midway between eye piece and objec-tive lens
anywhere between eye-piece and objective lens
much closer to the eye-piece than to the objective lens
much closer to the objective lens than to the eye piece

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Surveying
Dumpy level is most suitable when

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

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Surveying
The necessary geometrical condition for triangulation adjustment is:

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

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