Surveying
The difference between a level line and a horizontal line is that

level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is a curved line while hori-zontal line is a straight line
both are same

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

linear measurements are more accurate than angular measurements
All of these
angular measurements are more accurate than linear measurements
linear and angular measurements of the traverse are of equal accuracy

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Surveying
A ’level line’ is a

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

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