Surveying
The shortest distance between two places measured along the surface of the earth, is

Length of the arc of the great circle passing through them
Length of the equator between their longitudes
None of these
Length of the parallel between their longitudes

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Surveying
Dumpy level is most suitable when

All of these
fly levelling is being done over long distance
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
In triangulation surveys

Control stations are located from which detailed surveys are carried out
All listed here
The area is divided into triangular figures
Sides are not measured excepting the base line

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