CBSE 2025 · Region 5 · Set 1 · Q13 · 1 mark
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
From CBSE’s own marking scheme for this paper.
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic SemiconductorUnderstandassertion_reasonmedium
Practice Semiconductor Electronics: Materials, Devices and Simple Circuits →All Semiconductor Electronics: Materials, Devices and Simple Circuits questions
More from Semiconductor Electronics: Materials, Devices and Simple Circuits
- With the help of a circuit diagram, explain the working of a p-n junction diode as a full-wave rectifier.…2022 · asked 6×
- Write two points of difference between intrinsic and extrinsic semiconductors.2026 · asked 4×
- State the working principle of an LED. Write any two important advantages and two disadvantages of LED.2022 · asked 3×
- What are majority and minority charge carriers in an extrinsic semiconductor? A p-n junction is forward…2025 · asked 3×
- A pure Si crystal having 5 × 10^28 atoms m^-3 is dopped with 1 ppm concentration of antimony. If the…2024 · asked 3×
- With the help of circuit diagrams, briefly explain the forward biasing and the reverse biasing of a p-n…2026 · asked 3×
- In an intrinsic semiconductor, carrier's concentration is 5 × 10^8 m^-3. On doping with impurity atoms, the…2025 · asked 3×
- Assertion: A hole is an apparent free particle with effective positive electronic charge. Reason ( R ): A…2025 · asked 3×
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.