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It is advantageous to use the device hav...

It is advantageous to use the device having smaller value of least count". Explain the statement.

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In the measurement of a physical quantity, using device whose least count is very small the value of the absolute error will be smaller. As a result the percentage error will also be smaller. Hence the measurement can be more accurate.
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Internal micrometer is a measuring intrument used to measure internal diameter (ID) of a large cylinder bore with high accuracy. Construction is shown in figure. There is one fixed rod B (to the right in figure) and one moved rod A (to the left in figure). It is based on the particle of advancement of a screw when it is rotated in a nut with internal threads. Main scale reading can be directly seen on the hub which is fixed with respect to rod B. When the cap is rotated rod A moves in or cut depending on direction of rotation. The circular scale reading is seen by checking which division of circular scale coincide with the references line This is to be multiplied by LC to get circular scale reading. Least count = value of 1 circular scale division = ("pitch")/("number of division on circular scale") Length of rod A is chosen to match the ID(PQ) to be measured. Zero error is checked by taking reading between standard blocks fixed at normal value of ID to be measured. Zero error is positive if cap end is one the right of the main scale and negative it is on the left side. In an internal micrometer, main scale division is of 0.5 mm and there are 50 divisions in circular scale. The least count of the instrument is-

KUMAR PRAKASHAN-UNITS AND MEASUREMENT-SECTION -C (OBJECTIVE QUESTIONS (VSQS)
  1. State difference of mass and weight.

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  2. Explain the statement, "The accuracy of the measurement, can be made n...

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  3. It is advantageous to use the device having smaller value of least cou...

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  4. Why are errors expressed as positive and negative?

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  5. 1 gcm^(-3).... Kgm^(-3) (Fill the gaps)

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  6. Why quantities appearing with higher (power) exponent should be measu...

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  7. Write accuracy of atomic clock.

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  8. If f=x^(2) then what will be relative error in measurement of f ?

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  9. Write six physical quantities which have dimension of M^(1)L^(2)T^(-2)

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  10. Are dimension of mass and weight equal ?

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  11. Write physical quantity having dimension of Nm^(-1)s^(2).

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  12. Is it possible that physical quantity has dimension but do not have mo...

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  13. Explain supplementary quantities and their unit of SI system.

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  14. Which are inferior planets ?

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  15. What is elongation ?

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  16. In modern times which method is used to measure the distance between t...

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  17. "Fundamental unit of length is kilometer and fundamental unit of mass ...

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  18. x=a+bt+ct^(2)=x in metre and tis in sec then write unit of a, b, c.

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  19. Light year is unit of …... .

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  20. A physical quantity has unit ("Watt")/(m^(2)) write its dimension.

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