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ASVAB · Measuring and Marking

What tool is used to check whether a surface is perfectly flat (horizontal)?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

A level — contains a bubble in a liquid-filled vial; when the bubble is centered between the two lines, the surface is perfectly horizontal

  1. A A square
  2. B A level — contains a bubble in a liquid-filled vial; when the bubble is centered between the two lines, the surface is perfectly horizontal
  3. C A compass
  4. D A plumb bob

Why this is the answer

A level (spirit level or bubble level) contains a sealed vial of liquid with a trapped air bubble. When the surface being measured is exactly horizontal, the bubble centers between the two reference lines. Various types: torpedo level (small, used in tight spaces); 4-foot level (standard for construction); laser level (projects a horizontal laser line across a room). The plumb bob checks vertical alignment (plumb), not horizontal.
Source: ASVAB SI, Leveling Tools

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About this topic: Measuring and Marking

Measuring and marking questions cover rulers, tape measures, calipers, micrometers, squares and levels, including reading fractions of an inch and checking that something is square, level or plumb. This is one of 10 Shop Information questions on measuring and marking, each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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