36 past-paper questions on Semiconductor diode from ISC Class 12 Physics papers (2027-2018), newest first, in full. Questions 21-36 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.
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Draw: labelled characteristic curve (I-V graph) for a semiconductor diode during forward bias
Must show: knee voltage / threshold voltage, forward voltage on x-axis, forward current in mA on y-axis
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Draw: labelled circuit diagram of a full wave rectifier and graph of output voltage varying with time
Must show: centre-tapped secondary of transformer, two diodes D1 and D2, load resistor RL, graph showing pulsating dc output voltage with time
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Draw the graph described below.
Draw: I-V characteristic curve for a semiconductor diode during reverse bias
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Draw: Circuit diagram of a Zener diode as a voltage regulator
Must show: Unregulated DC input voltage, Series resistor R_s, Zener diode connected in reverse bias across load, Load resistor R_L, Regulated DC output voltage across R_L
Draw: Logic circuit showing how an AND gate is obtained using only NAND gates
Must show: First NAND gate with inputs A and B, Second NAND gate acting as inverter connected to output of first NAND gate, Final output Y = A \cdot B
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Draw: Energy band diagrams for conductors, semiconductors and insulators
Must show: Valence band, Conduction band, Energy band gap Eg (overlapping for conductor, small for semiconductor, large for insulator)
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