alleryThe reference standard used in measurement is chosen and:
AFixed by chance
BAgreed widely
CKept in secret
DChanged often
Answer & Solution
Correct answer: B. Agreed widely
1. A unit is arbitrary in the sense that it is chosen.
2. But it must be the same for everyone using it.
3. So it is internationally accepted.
_Source: syllabus Physics Part I, Chapter 2, Units and Measurement._
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