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Consider the following statements about scales.

1. A diagonal scale reads three successive units   2. The isometric scale is 0.816 of the true scale   3. A shrunk representative fraction is larger than the nominal one

  • A.1, 2 and 3 are all correct statements about scales
  • B.2 and 3 only are correct
  • C.1 and 3 only are correct
  • D.1 and 2 only are correct

Answer: D

Correct answer: 1 and 2 only are correct

Statements 1 and 2 are correct: a diagonal scale reads three successive units, and the isometric ratio is 0.816. Statement 3 has the direction wrong - the shrunk fraction is obtained by multiplying by a factor less than one, so it is smaller than the nominal fraction, not larger.

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