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JEE Main 2009
Exam
JEE Main
Year
2009
Subject
Physics
Chapter
Experimental Physics

JEE Main 2009 · Physics · Experimental Physics

In an experiment the angles are required to be measured using an...

In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree (=0.5∘)\left(=0.5^{\circ}\right), then the least count of the instrument is

Options

  1. Aone minute
  2. Bhalf minute
  3. Cone degree
  4. Dhalf degree

Correct answer

A. one minute

Step-by-step solution

 Least count = value of main scale division  No of divisions on vernier scale =130MSD=130×12∘=160∘=\text{ Least count }=\frac{\text{ value of main scale division }}{\text{ No of divisions on vernier scale }}=\frac{1}{30} \mathrm{MSD}=\frac{1}{30} \times \frac{1}{2}^{{}^{\circ}}=\frac{1}{60}^{{}^{\circ}}=1  minute \text{ minute }
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