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Which of the following is the smallest u...

Which of the following is the smallest unit?

A

`overset @ A`

B

fm

C

mm

D

nm

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JBD PUBLICATION-PHYSICAL WORLD AND MEASUREMENT-EXAMPLE
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  7. Can a physicl quantity have dimensions but no units?

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  14. Is SI system a coherent one?

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  15. Dooverset @ A and A.U. stand fo rthe same length?

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  18. What is the shortest disctance measured indirectly so far?

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  20. What is the order of mass of the universe?

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  21. What is the smallest mass measured indirectly so far?

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