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One atomic mass unit is defined as a mass equal to what share of a carbon 12 atom?
AOne twentieth
BOne fourteenth
COne twelfth
DOne sixteenth
Answer & Solution
Correct answer: C. One twelfth
1. The carbon 12 atom is split into equal reference parts.
2. One unit equals one of those twelve parts.
3. So it is one twelfth.
_Source: syllabus Science Class IX, Chapter 3, Atoms and Molecules._
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