NCCER Handtools Practice Test

Which term describes a measurement that is perfectly vertical?

Concave Folding Rule Plumb Bob Plumb

Correct Answer:

Plumb

Explanation:

Plumb describes a measurement that is perfectly vertical. A plumb line uses gravity with a weighted string to establish true vertical alignment; when the line settles, it points straight down, showing that the reference is plumb. The other terms don’t fit because concave describes a inward-curving shape, a folding rule is just a measuring tool for lengths, and a plumb bob is the device used to find vertical, while the measurement itself is described as plumb.

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