JEE Mains · Physics · STD 11 - Units,dimensions and measurement
- JEE Mains 2024
- Hard
- MCQ
There are \(100\) divisions on the circular scale of a screw gauge of pitch \(1 \mathrm{~mm}\). With no measuring quantity in between the jaws, the zero of the circular scale lies \(5\) divisions below the reference line. The diameter of a wire is then measured using this screw gauge. It is found the \(4\) linear scale divisions are clearly visible while \(60\) divisions on circular scale coincide with the reference line. The diameter of the wire is _______.
Pick an option to check your answer.
Answer & Solution
Correct Answer
(B) \(4.55 \mathrm{~mm}\)
Step-by-step Solution
Detailed explanation
\(\text { Least count }=\frac{1}{100} \mathrm{~mm}=0.01 \mathrm{~mm}\)
\(\text { zero error }=+0.05 \mathrm{~mm}\)
\(\text { Reading }=4 \times 1 \mathrm{~mm}+60 \times 0.01 \mathrm{~mm}-0.05 \mathrm{~mm}\)
\(=4.55 \mathrm{~mm}\)
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