NEET Physics Screw Gauge Assertion Reason Question
Assertion (A): The rachet mechanism in a screw gauge prevents undue pressure on the wire. | Reason (R): The rachet mechanism ensures that the screw gauge provides accurate measurements by clicking when the correct pressure is applied.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false.
Correct Answer
Detailed Explanation
The rachet mechanism in a screw gauge is designed to prevent excess pressure, which could alter the wire's diameter, thus ensuring accurate measurements, as indicated in the NCERT context.
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