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Explain accuracy and precision in measur...

Explain accuracy and precision in measurement.

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The accuracy of a measurement is a measure of how close the measured value is to the true value of the quantity.
Precision tells us to what resolution or limit the quantity is measured.
For example any digital watch that shows the time as 10:11:12 AM is very precise because it has least count of 1 second.
Any other digital clock has no second hand and it gives the time as 10:13 AM.The least count of watch is 1 minute which means that is less precise.
If the digital watch runs several minutes slow then time measured with this watch has no accuracy but it is precise
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What is error in measurement ?

Time for 20 oscillations of a pendulum is measured as t_(1)= 39.6 s, t_(2) = 39.9 s and t_(3) = 39.5 s . What is the precision in the measurements ? What is the accuracy of the measurement ?

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KUMAR PRAKASHAN-UNITS AND MEASUREMENT-SECTION -C (OBJECTIVE QUESTIONS (VSQS)
  1. Solve sqrt(6.5-6.32) by using significant figure.

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  2. Why parallax method is not used for distance between star and earth wh...

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  3. Explain accuracy and precision in measurement.

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  4. State difference of mass and weight.

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

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

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  7. Why are errors expressed as positive and negative?

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  8. 1 gcm^(-3).... Kgm^(-3) (Fill the gaps)

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

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  10. Write accuracy of atomic clock.

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

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

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  13. Are dimension of mass and weight equal ?

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

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

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

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  17. Which are inferior planets ?

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  18. What is elongation ?

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

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

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