# The Boundary of Water of a Still Lake Represents

By BYJU'S Exam Prep

Updated on: September 25th, 2023

The boundary of water of a still lake represents-

1. Level surface
2. Horizontal surface
3. Contour line
4. A concave surface

Answer: C. Contour line

## The boundary of water of a still lake represents a contour line.

Solution

Contour line: Counter line is the line joining the points having equal elevation. The boundary of water of a still lake represents equal elevation at all the points, So the boundary of water of a still lake represents the contour line.

Level surface: The level surface is the surface that is parallel to the earth’s curvature at all points. It is always perpendicular to the plumb line.

Horizontal surface: It is a flat surface that is tangential to the level surface. It is perpendicular to the plumb line at the point at which it is tangential to the level surface.

Note: In the case of plain surveying, the level surface and horizontal surface are the same.

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