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Which of the following is the most preci...

Which of the following is the most precise devise for measuring length ? (a) a Vernier callipers with 20 divisions on the sliding scals, coindiing with 19 main scale divions (b) a screw gauge of pitch 1mm and 100 divisions on the circular scale (c ) an optical instrument that can measure length to within a wave length of light.

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Show that a screw gauge of pitch I mm and 100 divisions is more precise than a vernier caliper with 20 divisions on the sliding scale.

The diameter of the steel ball is measured using a vernier caliper which has divisions of 0.1 cm on its main scale nad 10 division of its vernier scale match 9 division on the main scale. Three such measurements for a ball are as follows. If the zero error is 0.03cm , then mean corrected diameter is ............. cm.

NCERT TAMIL-UNITS AND MEASUREMENT-EXERCISE
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  2. A new unit of length is chosen such that the speed of light in vecuum ...

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  3. Which of the following is the most precise devise for measuring length...

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

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  5. Answer the following : (a) You are given a tread and a metre scale. ...

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  6. Answer the following : (a) You are given a tread and a metre scale. ...

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  7. Answer the following : (a) You are given a tread and a metre scale. ...

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  8. The photograph fo a house occupies an area of 1.7cm^2 on a 35 slide. T...

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  9. The number of significant figures in 0.007 is

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  10. The numebr of significant figures in 2.64xx10^(4)kg is

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

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  12. State the number of significant figures in 6.032 J .

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  13. State the number of significant figures in 6.032 J .

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  14. State the number of significant figures in 6.032 J .

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  15. The length , breadth , and thickness of a metal sheet are 4.234 m , 1....

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  16. The mass of a box measured by a grocer's balance is 2.300kg. Two gold ...

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

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  18. A book with many printing errors contains four different forumlae for...

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  19. A famous relation in phyics relates the moving mass m to the rest mas...

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  20. The unit of length convenint on the atomic scales is known as an angst...

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