CBSE 2026 · Region 5 · Set 1 · Q15 · 1 mark
Assertion (A) : Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
Reason (R) : For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei, it decreases with increasing Z.
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 EnergyUnderstandassertion_reasonmedium
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.