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Question 30167
JEE Physics · Medium

Errors and Measurements: Zero Error — Screw Gauge MCQ

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Zero Error — Screw GaugeMediumQuestion 30167

Question

A screw gauge has zero error +0.03 mm. The observed reading for a wire diameter is 0.78 mm. The actual diameter is:
  1. A
    0.75 mm
    Correct
  2. B
    0.81 mm
  3. C
    0.78 mm
  4. D
    0.03 mm

Correct answer

0.75 mm

Explanation

Positive zero error means the instrument reads more than true. Actual = observed − zero error = 0.78 − 0.03 = 0.75 mm.

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