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Question 30137
JEE Physics · Hard

Errors and Measurements: Screw Gauge — Backlash MCQ

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

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Screw Gauge — BacklashHardQuestion 30137

Question

Backlash error in a screw gauge occurs due to:
  1. A
    Incorrect calibration of the pitch
  2. B
    Loose mechanical coupling between screw and nut
    Correct
  3. C
    Zero error
  4. D
    Thermal expansion of the metal

Correct answer

Loose mechanical coupling between screw and nut

Explanation

Backlash arises when there is play (looseness) between the screw and nut, so reversing direction doesn't immediately move the thimble. Always rotate in one direction during measurement.

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