When the position of a point is to be located accurately by a perpendicular offset, the direction of perpendicular is set out by means of
A)theodolite
B)optical square
C)dumpy level
D)planimeter

Question

Quizplus · Accepted Answer

The optical square is the instrument specifically designed for setting out right angles, which is essential for accurately determining the perpendicular direction when locating the position of a point by a perpendicular offset.

When the Position of a Point Is to Be Located