CBSE 2025 · Region 5 · Set 1 · Q14 · 1 mark
Assertion (A) : During formation of a nucleus, the mass defect produced is the source of the binding energy of the nucleus. Reason ( $\displaystyle R$ ) : For all nuclei, the value of binding energy per nucleon increases with mass number.
Official answer
From CBSE’s own marking scheme for this paper.
(C)
Assertion (A) is true, but Reason (R) is false.
NucleiMass-Energy and Nuclear Binding EnergyAnalyseassertion_reasonmedium
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.