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Physics · 2026 · 2 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsIntrinsic Semiconductor2 marksUnderstandvery short answer
CBSE 2026 · Region 3 · Set 1 · Q21
How are charge carriers created in an intrinsic semiconductor? Explain.
How are charge carriers created in an intrinsic semiconductor ? Explain.
Marking-scheme solution
At low temperatures, all the covalent bonds in an intrinsic semiconductor remain intact. As temperature increases, thermal energy becomes available and electrons may break away, becoming free electrons available for conduction.
The neighbourhood from which the free electron has come out leaves a vacancy with an effective positive charge. This vacancy is called a hole. Hence charge carriers are created.
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.