Surveying
The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called

All of these
True horizon
Celestial horizon
Rational horizon

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Surveying
For mapping any country

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

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Surveying
A ’level line’ is a

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

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