Class 12 Physics Semiconductor Devices Notes and Important Questions
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Notes for Class 12 Semiconductor Devices (Physics) are shown above.
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Important Questions
During forward biasing of p-n junction diode, the width of depletion layer decreases. Justify.
Write the truth table for the combination of gates given in the figure below.
Identify which gate is obtained from the above combination of gates?
Write the symbol and truth table of NAND gate.
Explain the full wave rectification using two P-N junction diodes.
A diode can be used as a rectifier. What characteristic of a diode is used in rectification?
Draw a circuit diagram of full wave rectifier.
A NOR gate ‘opens’ and gives an output only if both inputs are ‘low’, but an OR gate ‘closes’. An AND gate ‘opens’ only if both inputs are ‘high’, but a NAND gate ‘closes’. Construct a truth table for the circuit shown below including the states at $E$, $F$, and $G$.
What property of a p–n junction diode enables its use in rectifiers?
Explain the construction and working of a full wave rectifier.
Write the truth table of two inputs NAND gate.
When a P-type semiconductor is suitably joined to an N-type semiconductor, a p-n junction is formed.
i) Describe the formation of potential barrier.
ii) When the p-n junction diode is forward biased, a large current flows, why?
For the digital circuit given below, write the truth table showing the outputs Y₁, Y₂ for all possible inputs at A and B.
Sketch the symbol of a p-n junction diode and indicate the polarity of its ends.
Copy the outline of a diode bridge rectifier and complete it by adding diodes in the gaps.
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Past Question Analysis
Historical exam-pattern data from past NEB question papers — not a prediction of future questions.
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Question Items
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Total Marks
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Papers Appeared In
| Year | Question Items | Marks |
|---|---|---|
| 2083 | 2 | 1 |
Semiconductor Devices introduces the basic principles behind semiconductor-based electronic components. Students study P-N junctions, forward and reverse biasing, diode characteristics and full-wave rectification. The chapter also introduces fundamental digital logic gates such as NOT, OR, AND, NAND and NOR, along with their truth tables and operations.
This page covers Semiconductor Devices, chapter 22 of 25 in the Class 12 Physics syllabus set by the National Examination Board (NEB). 9 important questions for this chapter are available, each with a full solution.
For numerical and derivation-based chapters like this one, working through past NEB questions is usually more useful than re-reading notes alone — try solving each important question above before checking the solution, then compare your working step by step.