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

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

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Surveying
A ’level line’ is a

line parallel to the mean spheriodal surface of earth
horizontal line
line passing through the objective lens and the eye-piece of a dumpy or tilting level
line passing through the center of cross hairs and the center of eye piece

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