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 need to analyze the given assertion (A) and reason (R) separately and then determine their relationship:

1. Assertion (A): In Vernier caliper if positive zero error exists, then while taking measurements, the reading taken will be more than the actual reading. 
   • A positive zero error in a Vernier caliper means that when the jaws are fully closed, the zero of the Vernier scale is to the right of the zero of the main scale. This results in the measurements being larger than the actual measurements since some positive value is added inadvertently to every reading. Thus, the assertion is true.
2. Reason (R): The zero error in Vernier Caliper might have happened due to manufacturing defect or due to rough handling.
   • Zero error can indeed occur in Vernier calipers due to various reasons such as manufacturing defects or mishandling. This can include improper calibration, wear and tear, or physical damage. Hence, the reason is also true.
3. Analysis of A and R:
   • While both statements are true, the reason (R) does not directly explain why having a positive zero error leads to measurements being more than the actual reading. The assertion explains the effect of the error on measurements, while the reason explains the cause of the error. Therefore, (R) is not the correct explanation for (A).

Thus, the correct answer is: Both (A) and (R) are correct but (R) is not the correct explanation of (A).

This understanding is crucial for exams as it tests the ability to discern between causation and correlation, as well as understanding concepts related to measurement instruments.

Answer 2

Both the assertion and reason are correct. The presence of a positive zero error means the Vernier scale is shifted, causing an overestimation of measurements. The reason accurately describes a possible cause for such errors.
The Correct answer is: Both (A) and (R) are correct but (R) is not the correct explanation of (A)