Least count of steel rule is ________.

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  1. 0.1 mm
  2. 0.05 mm
  3. 0.01 mm
  4. 0.5 mm

Answer (Detailed Solution Below)

Option 4 : 0.5 mm
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Concept:

Steel Rule

  • It is a straightedge with equally spaced markings along its length.
  • It is used to measure distances or to rule straight lines.
  • It is available in different lengths, the common sizes being 150 mm, 300 mm, and 600 mm.
  • Its reading accuracy (least count) is 0.5 mm.

Important Points

micrometer may have a least count of 0.01 mm while a Vernier scale on a caliper may have a least count of 0.02 mm.

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