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Physics · 2025 · 1 mark
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic Semiconductor1 markUnderstandassertion reason
CBSE 2025 · Region 5 · Set 1 · Q13
Assertion (A): The impurities in p-type Si are not pentavalent atoms. Reason (R): The hole density in valance band in p -type semiconductor is almost…
Assertion (A) : The impurities in p-type Si are not pentavalent atoms. Reason $\displaystyle (R)$ : The hole density in valance band in p -type semiconductor is almost equal to the acceptor density.
Official answer
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
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CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.