In construction, the term plumb indicates that something is ___.

In construction, the term plumb indicates that something is ___.

• A. Horizontal
• B. Diagonal
• C. Vertical
• D. Flat

Answer: (C)

Plumb indicates vertical alignment. A plumb line uses gravity with a weight hanging from a string to show true vertical; when the line settles, the edge or surface is considered plumb. This is the standard way to ensure walls, studs, and posts run upright. Horizontal would be level, not vertical; diagonal is slanted and not true vertical; flat describes a surface but does not convey up-and-down alignment. So vertical is the correct meaning.

Plumb indicates vertical alignment. A plumb line uses gravity with a weight hanging from a string to show true vertical; when the line settles, the edge or surface is considered plumb. This is the standard way to ensure walls, studs, and posts run upright. Horizontal would be level, not vertical; diagonal is slanted and not true vertical; flat describes a surface but does not convey up-and-down alignment. So vertical is the correct meaning.