A surface which is normal to the direction of gravity at all points, as indicated by a plumb line, is known as
A)datum surface
B)leverl surface
C)horizontal surface
D)vertical surface

Question

Quizplus · Accepted Answer

A level surface is defined as a surface that is perpendicular to the direction of gravity at all points. This means it is always normal to the direction indicated by a plumb line, which is used to establish what is "vertical" and, by extension, what is "level" or horizontal in a gravitational field.

A Surface Which Is Normal to the Direction of Gravity