Given below are two statements: one is labelled as Assertion(A) and the other is labelled as Reason (R).
Assertion (A): In Vernier calliper if positive zero error exists, then while taking measurements, the reading taken will be more than the actual reading.
Reason (R): The zero error in Vernier Calliper might have happened due to manufacturing defect or due to rough handling.
In the light of the above statements, choose the correct answer from the options given below:
Assertion (A): In Vernier calliper if positive zero error exists, then while taking measurements, the reading taken will be more than the actual reading.
Reason (R): The zero error in Vernier Calliper might have happened due to manufacturing defect or due to rough handling.
In the light of the above statements, choose the correct answer from the options given below:
- (A)Both (A) and (R) are correct and (R) is the correct explanation of (A)
- (B)Both (A) and (R) are correct but (R) is not the correct explanation of (A)✓ Correct
- (C)(A) is true but (R) is false
- (D)(A) is false but (R) is true
Answer: (B)
Solution
A positive zero error means the vernier scale reads a non-zero value with the jaws fully closed; this offset adds to every subsequent measurement, so the observed reading exceeds the true value — Assertion (A) is correct. Zero error itself arises from manufacturing tolerances or from wear and rough handling of the instrument — Reason (R) is also a true statement. But (R) explains where zero error comes from, not why a *positive* zero error specifically inflates readings (that follows from the correction rule, corrected reading = observed − zero error). So (R), though true, is not the correct explanation of (A).
JEE Main · 2024 · 27 Jan 2024 · Shift 2 · Single correct option