Question

Plumb bob lines at two different places in geodetic surveying will _____.

• A. Perpendicular to each other
• B. Intersect at the center of the earth
• C. Parallel to each other
• D. Intersect at the surface of the earth

Answer 1

The correct option is B Intersect at the center of the earth

When curvature of the earth is taken into account and the line lying on that curved surface is known as a level line normal to that line is called a plumb bob line.

Since the Plumb bob line lies in the direction of gravity thus it intersects at the center of the earth.



Note: Since in plane surveying, it is assumed that the surface is flat and does not take into account the special shape of the earth so the level line is considered as straight and all plumb lines are considered parallel.