The carpenter's ___ is used to test both level and plumb surfaces.

The carpenter's ___ is used to test both level and plumb surfaces.

• A. Line
• B. Chalk
• C. Square
• D. Level

Answer: (D)

To ensure both horizontal and vertical alignment, the carpenter's level is the tool built for testing those surfaces. It has vials with a liquid and an air bubble. When you lay it on a surface, the bubble centers between the marks if that surface is level. To check plumb, you hold the level vertically; the vertical vial’s bubble centers when the edge is perfectly upright. So the level can verify both level and plumb, which is why it’s the best choice for this purpose. The other items aren’t used to confirm horizontal or vertical alignment: a line is for marking straight paths, chalk is for marking marks, and a square checks right angles.

To ensure both horizontal and vertical alignment, the carpenter's level is the tool built for testing those surfaces. It has vials with a liquid and an air bubble. When you lay it on a surface, the bubble centers between the marks if that surface is level. To check plumb, you hold the level vertically; the vertical vial’s bubble centers when the edge is perfectly upright. So the level can verify both level and plumb, which is why it’s the best choice for this purpose. The other items aren’t used to confirm horizontal or vertical alignment: a line is for marking straight paths, chalk is for marking marks, and a square checks right angles.