CBSE 2026 · Region 1 · Set 1 · Q16 · 1 mark
Reason (A) : In Bohr model of hydrogen atom, the energy levels are discrete and quantised.
Reason (R) : In a hydrogen atom, the electrostatic force on the electron provides the necessary centripetal force to it to revolve around the nucleus.
Official answer
From CBSE’s own marking scheme for this paper.
(B)
AtomsBohr Model of the Hydrogen AtomUnderstandmcqmedium
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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.