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Question 30145
JEE Physics · Medium

Errors and Measurements: Screw Gauge — Negative Zero Error MCQ

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Screw Gauge — Negative Zero ErrorMediumQuestion 30145

Question

A screw gauge (LC = 0.01 mm, pitch = 1 mm) shows zero error = −0.05 mm. For a wire, MSR = 3 mm and CSR = 42. Corrected diameter is:
  1. A
    3.42 mm
  2. B
    3.37 mm
  3. C
    3.47 mm
    Correct
  4. D
    3.38 mm

Correct answer

3.47 mm

Explanation

Observed = 3 + 42×0.01 = 3.42 mm. Correction for negative zero error: +0.05 mm. Corrected = 3.42 + 0.05 = 3.47 mm.

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