JEE Main 2026 — Experimental Physics Question with Solution
JEE Main 2026 (02 April Shift 2)
Question
In a screw gauge the zero of main scale reference line coincides with the fifth division of the circular scale when two studs are in contact. There are divisions in circular scale and pitch of screw gauge is mm. When diameter of a sphere is measured, the reading of main scale is mm and division of circular scale coincides with the reference line of main scale. The diameter of sphere is _______ mm.
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
Least count of the screw gauge is given by:
When the two studs are in contact, the division of the circular scale coincides with the reference line. This indicates a positive zero error.
For the measurement of the sphere's diameter:
The true diameter is obtained by subtracting the zero error from the measured value:
Answer:
When the two studs are in contact, the division of the circular scale coincides with the reference line. This indicates a positive zero error.
For the measurement of the sphere's diameter:
The true diameter is obtained by subtracting the zero error from the measured value:
Answer:
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This is a previous-year question from JEE Main 2026, covering the Experimental Physics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.