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Assertion: an infrared thermometer gives the most accurate temperature measurement available. Reason: it requires no contact with the surface.

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

Answer: D

Freedom from contact is exactly its advantage and is why it is used, but its accuracy depends wholly on the emissivity assumed and on what the surface reflects. A calibrated contact probe is the more accurate instrument by a wide margin.

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