Semiconductors & Electronic Devices — JEE Main PYQs & Practice Questions

Semiconductors & Electronic Devices is a Physics chapter in the JEE Main syllabus. This page brings together 167 previous-year and practice questions on Semiconductors & Electronic Devices, organised into 7 topics: Energy Bands, Intrinsic and Extrinsic Semiconductors, p-n Junction Diode, Rectifiers, Zener Diode, Transistors and Logic Gates. Most questions come with a step-by-step solution you can work through free in PrepWiser.

Download Semiconductors & Electronic Devices JEE Main PYQs as a free PDF (with answer key)

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Chapter weightage: how many questions each chapter had per shift in the 2024–26 papers.

Energy Bands

• The energy band gap of semiconducting material to produce violet (wavelength = 4000Aᵒ )…
• Match List I with List II: List I | List II; A. | Intrinsic semiconductor | I. |…
• If a semiconductor photodiode can detect a photon with a maximum wavelength of 400 nm…

Intrinsic and Extrinsic Semiconductors

• Statement I : By doping silicon semiconductor with pentavalent material, the electrons…
• The effect of increase in temperature on the number of electrons in conduction band (nₑ)…
• In a semiconductor, the number density of intrinsic charge carries at 27°C is 1.5 ×…
• At absolute zero, an intrinsic semiconductor behaves as:
• The resistivity (ρ) of semiconductor varies with temperature. Which of the following…
• For extrinsic semiconductors; when doping level is increased;
• Consider a n-type semiconductor in which nₑ and nₕ are number of electrons and holes…
• An n-type semiconductor is formed by doping silicon with:
• The acceptor level of a p-type semiconductor is 6 eV. The maximum wavelength of light…

p-n Junction Diode

• Identify the solar cell characteristics from the following options :
• Given below are two statements : one is labelled as Assertion A and the other is…
• Consider a situation in which reserve biased current of a particular P-N junction…
• The maximum rated power of the LED is 2 mW and it is used in the circuit with input…
• A voltage regulating circuit consisting of Zener diode, having break-down voltage of 10…
• Which of the following circuits represents a forward biased diode? Choose the correct…
• A p-n junction diode conducts appreciable current when:
• The I-V characteristics of an electronic device shown in the figure. The device is :
• The photodiode is used to detect the optical signals. These diodes are preferably…
• If each diode has a forward bias resistance of 25 Ω in the below circuit, Which of the…
• Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon…
• Statement I : When a Si sample is doped with Boron, it becomes P type and when doped by…
• Which one of the following statement is not correct in the case of light emitting…
• The circuit contains two diodes each with a forward resistance of 50Ω and with infinite…
• If the potential barrier across a p-n junction is 0.6 V. Then the electric field…
• Both the diodes used in the circuit shown are assumed to be ideal and have negligible…
• In the given figure, each diode has a forward bias resistance of 30Ω and infinite…
• Conductivity of a photodiode starts changing only if the wavelength of incident light is…
• In the given circuit the input voltage Vᵢₙ is shown in figure. The cut-in voltage of p-n…
• A 5V battery is connected across the points X and Y. Assume D₁ and D₂ to be normal…

Rectifiers

• Statement - I : To get a steady dc output from the pulsating voltage received from a…
• A half-wave rectifier using one diode has output frequency equal to input frequency f. A…
• Choose the correct waveform that can represent the voltage across R of the following…
• Match List I with List II. List I | List II; (a) | Rectifier | (i) | Used either for…

Zener Diode

• In the following circuit, the reading of the ammeter will be ( Take Zener breakdown…
• For the given circuit, the power across Zener diode is .............. mW.
• Zener breakdown occurs in a p - n junction having p and n both :
• Take the breakdown voltage of the zener diode used in the given circuit as 6V. For the…
• A zener of breakdown voltage V z = 8 V and maximum zener current, I ZM = 10 mA is…
• The value of power dissipated across the zener diode (V z = 15V) connected in the…
• The zener diode has a V z = 30V. The current passing through the diode for the following…
• A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener…
• A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input…
• The circuit diagram used to study the characteristic curve of a zener diode is connected…
• In the circuit shown below, maximum zener diode current will be _________ mA.
• In the given circuit, the breakdown voltage of the Zener diode is 3.0 V. What is the…
• For the circuit shown below, calculate the value of I z :
• A zener diode having zener voltage 8 V and power dissipation rating of 0.5 W is…
• In a given circuit diagram, a 5 V zener diode along with a series resistance is…
• The circuit shown below is working as a 8 V dc regulated voltage source. When 12 V is…
• A 8 V Zener diode along with a series resistance R is connected across a 20 V supply (as…
• A zener diode of power rating 2W is to be used as a voltage regulator. If the zener…
• In the given circuit if the power rating of Zener diode is 10 mW, the value of series…
• A Zener diode of breakdown voltage 10 V is used as a voltage regulator as shown in the…

Transistors

• An n.p.n transistor with current gain β=100 in common emitter configuration is shown in…
• The typical transfer characteristics of a transistor in CE configuration is shown in…
• A circuit is arranged as shown in figure. The output voltage V₀ is equal to…
• In an NPN transistor operating in active region, the base-emitter junction is forward…
• The correct relation between α (ratio of collector current to emitter current) and β…
• A transistor is connected in common emitter circuit configuration, the collector supply…
• For a transistor in CE mode to be used as an amplifier, it must be operated in :
• From the given transfer characteristic of a transistor in CE configuration, the value of…
• For a given transistor amplifier circuit in CE configuration V_(CC)=1 V, R_C=1 k Ω…
• The typical output characteristics curve for a transistor working in the common-emitter…
• Given below are two statements : Statement I: In a typical transistor, all three regions…
• In an n-p-n common emitter (CE) transistor the collector current changes from 5 mA to 16…
• A transistor is used in an amplifier circuit in common emitter mode. If the base current…
• For a transistor α and β are given as α = I_C/I_E and β = I_C/I_B. Then the correct…
• The positive feedback is required by an amplifier to act an oscillator. The feedback…
• A transistor is used in common-emitter mode in an amplifier circuit. When a signal of 10…
• In a common-emitter NPN transistor amplifier, the input and output voltages differ in…
• For a constant collector-emitter voltage of 8 V, the collector current of a transistor…
• In an experiment of CE configuration of n-p-n transistor, the transfer characteristics…
• An npn transistor operates as a common emitter amplifier with a power gain of 10⁶. The…

Logic Gates

• Identify the correct output signal Y in the given combination of gates (as shown) for…
• Identify the logic gate given in the circuit :
• Identify the logic operation carried out by the given circuit :-
• Identify the operation performed by the circuit given below :
• In the logic circuit shown in the figure, if input A and B are 0 to 1 respectively, the…
• In the following circuit, the correct relation between output (Y) and inputs A and B…
• If X and Y are the inputs, the given circuit works as _________.
• If V A and V B are the input voltages (either 5V or 0V) and V₀ is the output voltage…
• For the given logic circuit, which of the following inputs combination will make both…
• The output Y for the inputs A and B of circuit is given by Truth table of the shown…
• Identify the correct truth table of the given logic circuit.
• Find the truth table for the function Y of A and B represented in the following figure.
• The outputY for the given inputsA andB to the circuit is:
• The output of the given combination gates represents :
• The logic circuit shown above is equivalent to :
• The truth table for the circuit given below is:
• The correct truth table for the following logic circuit is :
• The truth table for the following logic circuit is :
• Draw the output signal Y in the given combination of gates.
• In the circuit, the logical value of A=1 or B=1 when potential at A or B is 5 V and the…

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Frequently asked questions

How many Semiconductors & Electronic Devices questions are there for JEE Main?

PrepWiser has 167 Semiconductors & Electronic Devices questions for JEE Main, grouped into 7 topics such as Energy Bands, Intrinsic and Extrinsic Semiconductors and p-n Junction Diode.

Are these Semiconductors & Electronic Devices questions from previous-year JEE Main papers?

Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.

Where can I see the answers and solutions to these Semiconductors & Electronic Devices questions?

Open any Semiconductors & Electronic Devices question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.