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Which of the following is the most preci...

Which of the following is the most precise instrument for measuring length?

A

a vernier callipers with 20 divisions on the sliding scale

B

a screw gauge of pitch 1 mm and 100 divisions on the circular scale

C

an optical instrument that can measure length to within a wavelength of light

D

all the above

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The correct Answer is:
C
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AAKASH SERIES-UNITS AND MEASUREMENTS-EXERCISE -1 A
  1. What is the dimensional formula of angular velocity?

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  2. Solar constant and Stefan's constant have same dimensions in

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  3. Which of the following is the most precise instrument for measuring le...

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  4. For example , the true value of a certain length is near 3.678 cm. In ...

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  5. For example , the true value of a certain length is near 3.678 cm. In ...

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  6. The errors due to imperfect design or calibration of the measuring ins...

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  7. For example, if you , by habit, always hold your head a bit too far to...

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  8. By improving experimental techniques, selecting better instruments and...

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  9. Unpredicatable fluctuations in temperature, voltage supply, mechanical...

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  10. In a measurement, a choice of change of different units

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  11. Zero error in an instrument introduces

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  12. Which of the following is systematic error

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  13. What type of elements are found to occur in the combined state?

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  14. By repeating the same measurement several times, the errors that can b...

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  15. In an experiment if the measured values of a physical quantity are hig...

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  16. In an experiment if the measured values of a physical quantity have a ...

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  17. The measured value of physical quantity expressed to infinite number o...

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  18. The arithmetic mean of several measurements is called

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  19. Zero errors of measuring instruments are called

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  20. The type of errors that can never be completely eliminated are

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