CBSE 12 Physics · U9
Electronic Devices
CBSE Class 12 Physics Unit IX: energy bands, intrinsic and extrinsic semiconductors, p-type and n-type materials, p-n junction, diode I-V characteristics, forward and reverse bias, and diode rectifier circuits.
Test yourself
A focused, distraction-free run through 25 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 9.1
Energy Bands in Solids
Qualitative band-gap model for conductors, semiconductors and insulators
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Topic 9.2
Intrinsic and Extrinsic Semiconductors
Electron-hole pairs, doping, donor and acceptor impurities, p-type and n-type materials
Topic 9.3
p-n Junction and Biasing
Diffusion, depletion region, potential barrier, forward bias and reverse bias
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Topic 9.4
Diode I-V Characteristics
Forward and reverse characteristics of a semiconductor diode and graphical interpretation
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Topic 9.5
Diode as a Rectifier
Half-wave and full-wave rectifier action using the unidirectional conduction of a diode
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