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The figure below shows part of a vernier caliper when the jaws are closed without an object between the jaws.
         Figure showing part of a vernier calipers

  1. What is the value of the zero error of the calipers?
  2. A student used the same vernier calipers in (a) above to measure the diameter of a test tube whose actual diameter is 2.15cm. What was the reading shown by the calipers

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  1. −0.02mm
  2. 2.15=reading − error
    2–15=reading + 0.02
    Reading = 2.13mm
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