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On a plain scale the zero is placed

  • A.at the extreme right-hand end of the whole scale
  • B.at the exact centre of the constructed scale
  • C.at the end of the first main division from the left
  • D.at the extreme left-hand end of the whole scale

Answer: C

Correct answer: at the end of the first main division from the left

The first main division is subdivided to give the smaller unit, and the zero is placed at its right-hand end so that the subdivisions read leftward from zero while the whole units read rightward. A distance is then set off by taking whole units to the right of zero and the fraction to the left, in one span of the dividers.

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