Q 1. Define the atomic mass unit.
An atomic mass unit is a unit of mass used to express the weight subatomic particles, where one unit is equal to exactly one-twelfth the mass of a carbon-12 atom.
CBSE Class 10 board exams twice a year ‘relief’ or ‘burden’? Parents, schools share mixed views
CBSE Class 10 exams twice a year from 2026; 64.4% students in favor, second attempt optional
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