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Accuracy of an instrument describes

  • A.how close its reading is to the true value
  • B.how closely repeated readings of the same quantity agree
  • C.the smallest change in input it can detect
  • D.the ratio of its output change to its input change

Answer: A

Correct answer: how close its reading is to the true value

Accuracy is a statement about correctness, and it requires a reference - the true value, or the best available approximation to it from a standard. An instrument reading consistently 2 per cent high is inaccurate however repeatable its readings are, which is the distinction from precision.

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