Surveying
Dumpy level is most suitable when

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

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Surveying
For mapping any country

All listed here
Geodetic triangulation of greatest possible sides and accuracy is carried out
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy

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Surveying
The rise and fall method

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

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