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Units and Measurements question

2008 · Shift 0 · Q62
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Units and Measurements question

2008 · Shift 0 · Q62

JEE MainPhysicsUnits and MeasurementsMCQ+4 / −1
An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distances are measured by
  1. A
    a vernier scale provided on the microscope
  2. B
    a standard laboratory scale
  3. C
    a meter scale provided on the microscope
  4. D
    a screw gauge provided on the microscope
View written solutionFree

Correct answer: A

  1. Understand the instrument

    A travelling microscope is used to measure small distances accurately by moving the microscope along a graduated scale.

  2. How are readings taken in a travelling microscope?

    The travelling microscope has:

    • a main scale, and
    • a vernier scale attached to it.

    The precise measurement of displacement is obtained using the vernier scale reading together with the main scale.

  3. Check the options

    • A: a vernier scale provided on the microscope
      This is correct, because the travelling microscope measures distance using its vernier arrangement.

    • B: a standard laboratory scale
      Incorrect. A separate laboratory scale is not used for the precise measurement in this setup.

    • C: a meter scale provided on the microscope
      Incorrect. The instrument does not measure by a meter scale as the essential precise reading device.

    • D: a screw gauge provided on the microscope
      Incorrect. A travelling microscope does not measure distance using a screw gauge.

  4. Final answer

    Therefore, the correct option is: A\boxed{\text{A}}A​

  5. Comparison with stored correct answer

    Stored correct answer: A
    Derived answer: A
    Hence, they agree.

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