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Discussion

The zero error of an instrument is

  • A.a random error reducible only by averaging
  • B.a gross error arising from the observer's mistake
  • C.an environmental error caused by temperature change
  • D.a systematic error correctable by adjustment

Answer: D

A pointer resting off zero shifts every reading by the same amount, which is the definition of a systematic error, and the adjuster exists to remove it. Checking it before and after a set of readings is standard practice.

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