Class 12 Physics — Chapter 14: Semiconductor Electronics
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Practise Class 12 Physics Chapter 14, "Semiconductor Electronics", with 90 NCERT-aligned multiple-choice questions. The set is split into 30 Easy, 30 Medium and 30 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Semiconductor Electronics" is one of the chapters where numerical problem-solving, derivations and conceptual application really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Semiconductor Electronics, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 12 Physics mastery score. A few sample questions are shown below; sign in free to practise all 90.
Key concepts: Semiconductor Electronics (Class 12 Physics)
This chapter covers semiconductors, p-n junction diodes and their applications as rectifiers, and special diodes.
- Semiconductors
- Materials with conductivity between conductors and insulators; intrinsic (pure) vs extrinsic (doped) types.
- n-type & p-type
- Doping with pentavalent atoms gives n-type (electrons as majority carriers); trivalent gives p-type (holes as majority).
- p-n junction
- Formed at the boundary of p and n regions; a depletion layer and barrier potential develop across it.
- Diode biasing
- Forward bias lowers the barrier and conducts; reverse bias widens the depletion layer and blocks current.
- Rectification & special diodes
- Diodes convert AC to DC (half- and full-wave rectifiers); special diodes include the Zener (voltage regulation), LED, photodiode and solar cell.
💡 Exam tips for Semiconductor Electronics
- In n-type, majority carriers are electrons; in p-type, holes — the material stays electrically neutral overall.
- A diode conducts only in forward bias; the Zener diode is used in reverse bias for voltage regulation.
Sample questions
Pure silicon is an example of which type of material?
Pure Si has a moderate band gap (~1.1 eV) and is an intrinsic semiconductor.
A forward-biased pn-junction diode behaves as:
Forward bias narrows depletion region, allowing easy current flow.
A bipolar junction transistor (BJT) consists of how many terminals?
BJT has three regions and two pn-junctions.
Semiconductor Electronics — FAQs
What are the key concepts in Class 12 Physics Semiconductor Electronics?+
This chapter covers semiconductors, p-n junction diodes and their applications as rectifiers, and special diodes. Key ideas include Semiconductors, n-type & p-type, p-n junction, Diode biasing, Rectification & special diodes.
What does Class 12 Physics Chapter 14 (Semiconductor Electronics) cover on XamBaaz?+
It covers 90 NCERT-aligned MCQs on "Semiconductor Electronics" — 30 Easy, 30 Medium and 30 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Semiconductor Electronics" questions free to practise?+
Yes — sign in with Google to practise "Semiconductor Electronics" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Semiconductor Electronics" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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