CBSE 2025 · Region 1 · Set 2 · Q14 · 1 mark
Assertion (A) : We cannot form a p-n junction diode by taking a slab of a p-type semiconductor and physically joining it to another slab of a n-type semiconductor.
Reason (R) : In a p-type semiconductor $\displaystyle \eta_{\mathrm{e}} \gg \eta_{\mathrm{h}}$ while in a $\displaystyle n$-type semiconductor $\displaystyle \eta_{\mathrm{h}} \gg \eta_{\mathrm{e}}$.
Official answer
From CBSE’s own marking scheme for this paper.
(C)
Assertion (A) is true, but Reason (R) is false.
Semiconductor Electronics: Materials, Devices and Simple Circuitsp-n JunctionAnalyseassertion_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.