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Which of the following is the most preci...

Which of the following is the most precise device 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 ?

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NCERT BANGLISH-UNITS AND MEASUREMENT-EXERCISE
  1. A new unit of length is chosen such that the speed of light in vacuum ...

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  2. Which of the following is the most precise device for measuring length...

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  3. A student measures the thickness of a human hair by looking at it thro...

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  4. The mean diameter of a thin brass rod is to be measured by vernier cal...

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  5. The photograph of a house occupies an area of 1.75 cm^(2) on a 35 mm s...

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  6. State the number of significant 0.007 m^(2)

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  7. State the number of significant 2.64xx10^(24) kg

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  8. State the number of significant 0.2370 g cm^(-3)

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  9. State the number of significant 6.320 J

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  10. State the number of significant 6.032 N m^(-2)

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  11. State the number of significant 0.0006032 m^(2)

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  12. The length , breadth and thickness of a rectangular sheet of metal are...

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  13. The mass of a box measured by a grocer's balance is 2.30 kg. Two gold ...

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  14. A physical quantity P is related to four observables a,b,c and d as fo...

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  15. A book with many printing errors contains four different formulas for ...

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  16. A famous relation in physics relates 'moving mass' m to the 'rest mass...

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  17. The unit of length convenient on the atomic scale is known as an angs...

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  18. One mole of an ideal gas at standard temperature and pressure occupies...

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  19. Explain this common observation clearly: If you look out of the window...

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  20. The principle of 'parallax' in section 2.3.1 is used in the determinat...

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