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Question 30151
JEE Physics · Hard

Errors and Measurements: Vernier — Backward Reading MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Vernier — Backward ReadingHardQuestion 30151

Question

If the zero mark of a vernier scale is behind the 0 on the main scale when closed (vernier reads −2 divisions), this instrument has:
  1. A
    Positive zero error
  2. B
    Negative zero error
    Correct
  3. C
    No zero error
  4. D
    Random error

Correct answer

Negative zero error

Explanation

When the vernier zero is to the left (behind) the main scale zero when closed, the instrument shows less than the true value — this is negative zero error. Correction: add the magnitude to all readings.

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