Question

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 :

• 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)
• C. (A) is true but (R) is false
• D. (A) is false but (R) is true

Answer 1

The Correct Option is B

To determine the correct answer, we must analyze Assertion (A) and Reason (R) individually and then establish their relationship.

1. Assertion (A): If a Vernier caliper exhibits a positive zero error, the measured reading will exceed the actual reading.
   • A positive zero error occurs when the Vernier scale's zero mark is positioned to the right of the main scale's zero mark when the jaws are fully closed. This condition invariably adds a positive value to every measurement, making it larger than the true value. Consequently, the assertion is valid.
2. Reason (R): Manufacturing defects or rough handling can cause zero error in a Vernier caliper.
   • Zero error in Vernier calipers can indeed stem from various sources, including manufacturing flaws, improper calibration, wear and tear, or physical damage resulting from mishandling. Therefore, the reason is also valid.
3. Analysis of (A) and (R):
   • Although both statements are accurate, Reason (R) does not provide a direct explanation for why a positive zero error causes readings to be higher than the actual value. The assertion details the impact of the error on measurements, while the reason explains the origin of the error. As such, (R) does not correctly explain (A).

Therefore, the accurate conclusion is: Both (A) and (R) are correct, but (R) does not correctly explain (A).

This comprehension is vital for examinations, as it assesses the ability to differentiate between causation and correlation and to understand the principles of measurement instruments.