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JEE Mains · Physics · STD 11 - 1. units,dimensions and measurement
If the screw on a screw-gauge is given six rotations, it moves by \(3\; \mathrm{mm}\) on the main scale. If there are \(50\) divisions on the circular scale the least count of the screw gauge is
- A \(0.001\; mm\)
- B \(0.001\; cm\)
- C \(0.02\; mm\)
- D \(0.01\; cm\)
Answer & Solution
Correct Answer
(B) \(0.001\; cm\)
Step-by-step Solution
Detailed explanation
On six rotation, reading of main scale changes by \(3 \mathrm{mm} .\) 1 rotation corresponds to \(\frac{1}{2} \mathrm{mm}\) Also no. of division on circular scale \(=50 .\) Least count of the screw gauge will be \(\frac{0.5}{50} \mathrm{mm}=0.001 \mathrm{cm}\)
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