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Assertion (A): Sample variation usually exceeds instrument repeatability.
Reason (R): Real materials are less uniform than a modern instrument is unstable.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the reason gives the comparison, and averaging addresses the larger source of error. Chasing instrument precision beyond that point yields little benefit. Averaging addresses the larger source of error.

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