Surveying
A ’level line’ is a

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

ANSWER DOWNLOAD EXAMIANS APP

Surveying
For a line AB

the forebearing of AB and back bearing of BA differ by 180°
none is correct
the forebearing of AB and back bearing of AB differ by 180°
both (A) and (B) are correct

ANSWER DOWNLOAD EXAMIANS APP