A 'level line' is a-
-
A.
Horizontal line
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B.
Line passing through the center of cross
hairs and the center of eye piece
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C.
Line parallel to the mean spheriodal
surface of earth
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D.
Line passing through the objective lens and the eye-piece of a dumpy or tilting level
Correct Answer:
C. Line parallel to the mean spheriodal
surface of earth
Explanation:
A level line is defined as a curved line that is equidistant from the Earth's center at every point, making it parallel to the mean spheroidal surface of the Earth. In surveying, this line is perpendicular to the direction of gravity (plumb line) at any given point along its length. It differs from a horizontal line, which is a straight line tangential to a level line at a specific point.
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