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Assertion: a semiconductor strain gauge is not used for precise stress analysis. Reason: its gauge factor is much smaller than that of a metallic gauge.

  • A.the assertion is true but the reason given for it is false
  • B.both the assertion and the reason are true and the reason explains the assertion
  • C.both the assertion and the reason are true but the reason does not explain the assertion
  • D.the assertion is false although the reason offered is a true statement in itself

Answer: A

Its gauge factor is far larger, not smaller, which is its whole attraction. It is avoided for precise work because that large factor is nonlinear and varies strongly with temperature, so the reason given is simply wrong.

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