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GK QUESTION#3095

Assertion (A): The internal jaws of a vernier calliper are used to measure the internal diameter of hollow objects like pipes or cylinders. Reason (R): The external jaws of a Vernier callipers are meant for measuring internal dimensions.

  1. ABoth A and R are true, and R is the correct explanation of A.
  2. BBoth A and R are true, but R is not the correct explanation of A.
  3. CA is true, but R is false.Correct answer
  4. DA is false, but R is true.
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Answer

C. A is true, but R is false.

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Explanation

The internal jaws measure inside dimensions, such as the bore of a hollow cylinder. The external jaws measure outside dimensions, such as the diameter of a solid cylinder. Assertion A is true and Reason R is false.

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