Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

All of these
By subtracting their longitudes if places are in the same hemisphere
By adding their longitudes if places are in the different hemispheres
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres

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Surveying
Dumpy level is most suitable when

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

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