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.
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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.