What are JEE Semiconductor Electronics previous years questions?

These are past exam questions that help you understand semiconductors, diodes, transistors, and logic gates.

Is Semiconductor Electronics important for JEE?

Yes, it is a scoring chapter and usually has 2–3 questions in JEE.

Which topics are covered in semiconductor questions?

Topics include p-n junction, diodes, transistors, logic gates, and digital electronics.

How to prepare Semiconductor Electronics for JEE 2026?

Focus on formulas, understand concepts, practice previous years questions, and revise regularly.

What are the important formulas in this chapter?

Key formulas include transistor current relations, current gain (α, β), and logic gate outputs.

Are semiconductor questions easy in JEE?

Yes, most questions are direct and concept-based if your basics are clear.

Where can I download semiconductor previous years questions PDF?

You can download the PDF from trusted JEE preparation platforms.

What mistakes should I avoid in semiconductor electronics?

Avoid confusion in logic gates, transistor relations, and p-type vs n-type concepts.

JEE Semiconductor Electronics PYQs with Video Solutions PDF

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JEE Semiconductor Electronics PYQs

JEE Semiconductor Electronics PYQs help you revise key concepts and understand how they have been tested in previous exams. These questions cover topics such as intrinsic and extrinsic semiconductors, p-n junction diodes, forward and reverse bias, rectifiers, transistors, and logic gates. Check the syllabus for your target exam and year before practising older questions, as the topics covered may differ.

Solving semiconductor electronics questions requires a clear understanding of charge carriers, device behaviour, and circuit connections. Start with the basics, then practise concept-based and numerical JEE Questions to identify where you need more revision. For circuit problems, determine the biasing conditions and trace the current path before calculating the answer.

This page brings together a downloadable PYQ PDF, important formulas, and common mistakes to avoid. Use these resources alongside your JEE Study material to revise the chapter and practise applying each concept.

JEE Semiconductor Electronics Important PYQs PDF

Download the JEE Semiconductor Electronics Important PYQs PDF to practise selected previous year questions from this chapter. While solving, identify the concept being tested, attempt the question independently, and review the solution to understand any errors.

When using JEE Advanced previous papers for additional practice, check whether semiconductor electronics is included in the syllabus for your target year. Older papers can contain topics that are no longer relevant to your exam. Prioritise questions that match the applicable syllabus.

After completing the PDF, revisit questions you answered incorrectly or took too long to solve. This helps you focus your revision on specific gaps, such as diode biasing, charge carriers, or logic gate outputs.

Download Top 40 JEE Semiconductor Electronics PYQs PDF

Important Formulas for JEE Semiconductor Electronics PYQs

Important semiconductor electronics formulas include transistor current relations, current gain expressions, and Boolean expressions for logic gates. Revise the meaning of each symbol and understand when a formula applies. For diode circuits, identifying forward or reverse bias is often the first step.

Download the formula PDF below for revision. The table provides a quick reference; use the transistor and logic gate entries where they are relevant to your prescribed syllabus.

Download JEE Semiconductor Electronics Formula PDF

Concept	Formula
Current Relation in a Transistor	$$I_E = I_B + I_C$$
Current Gain in Common Base	$$\alpha = \frac{I_C}{I_E}$$
Current Gain in Common Emitter	$$\beta = \frac{I_C}{I_B}$$
Relation Between Alpha and Beta	$$\beta = \frac{\alpha}{1-\alpha}$$
Relation Between Beta and Alpha	$$\alpha = \frac{\beta}{1+\beta}$$
Electrical Power	$$P = VI$$
Ohm’s Law for a Resistor	$$V = IR$$
Output of NOT Gate	$$Y = \overline{A}$$
Output of AND Gate	$$Y = A\cdot B$$
Output of OR Gate	$$Y = A+B$$
Output of NAND Gate	$$Y = \overline{A\cdot B}$$
Output of NOR Gate	$$Y = \overline{A+B}$$

Here, emitter current, base current, and collector current are represented by $$I_E$$, $$I_B$$, and $$I_C$$ respectively. In the logic gate expressions, the dot represents AND, the plus sign represents OR, and the bar represents NOT. Boolean operations should not be treated as ordinary arithmetic.

Remember that a diode does not generally obey Ohm’s law. In a diode circuit, use the device model or voltage drop specified in the question, then apply circuit laws to calculate the required quantities.

Top 5 Common Mistakes to Avoid in JEE Semiconductor Electronics PYQs

Common mistakes in JEE Semiconductor Electronics PYQs include confusing charge carriers, identifying diode bias incorrectly, mixing up transistor currents, and misreading logic circuits. Use the following checks to improve your accuracy during practice.

1. Confusing p-type and n-type semiconductors
Holes are the majority charge carriers in p-type semiconductors, while electrons are the majority carriers in n-type semiconductors. Both types remain electrically neutral overall. Do not assume that p-type means positively charged or n-type means negatively charged.

2. Identifying forward and reverse bias incorrectly
A p-n junction is forward biased when the p-side is connected to a higher potential than the n-side. In reverse bias, the polarity is reversed. Check the potential across the diode terminals before deciding whether it conducts under the model given in the question.

3. Mixing up transistor current relations
The emitter current equals the sum of the base and collector currents. Also, common-base current gain uses emitter current in the denominator, while common-emitter current gain uses base current. Write the relevant relation before substituting values.

4. Confusing logic gate outputs
An AND gate gives an output of 1 only when all inputs are 1. An OR gate gives an output of 1 when at least one input is 1. NAND and NOR gates invert the outputs of AND and OR gates respectively. For combined gates, calculate each intermediate output separately.

5. Rushing through circuit diagrams
Check diode orientation, battery polarity, resistor values, and junction connections before solving. After attempting a JEE Advanced mock test, review circuit-reading errors in the relevant questions and note what you overlooked. This makes your analysis more useful than checking the final score alone.

List of JEE Semiconductor Electronics PYQs

Here is a short set of JEE-style semiconductor electronics questions for practice. These include common question types from semiconductors, diodes, transistors, and logic gates. Solving them regularly can help you become faster and more confident.

Question 1

The charge stored by the capacitor C in the given circuit in the steady state is ______ $$\mu C$$.

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Question 2

The given circuit works as:

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Question 3

The correct truth table for the given input data of the following logic gate is:

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Question 4

The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at $$V_{z}=5V$$ and the desired current in load is 5 mA. The unregulated voltage source can supply upto 25 V. Considering the Zener diode can withstand four times of the load current, the value of resistor $$R_{s}$$ (shown in circuit) should be ____ Ω .

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Question 5

Find the correct combination of A, B, C and D inputs which can cause the LED to glow.

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Question 6

A voltage regulating circuit consisting of Zener diode, having break-down voltage of 10 V and maximum power dissipation of 0.4 W, is operated at 15 V. The approximate value of protective resistance in this circuit is ___ Ω.

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Question 7

Identify the correct truth table of the given logic circuit.

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Question 8

Assuming in forward bias condition there is a voltage drop of 0.7V across a silicon diode, the current through diode $$D_{1}$$ in the circuit is ___ mA.
(Assume all diodes in the given circuit are identical)

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Question 9

For the given logic gate circuit, which of the following is the correct truth table?

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Question 10

Two p-n junction diodes $$D_{1}\text{ and }D_{2}$$ are connected as shown in figure. A and B are input signals and C is the output. The given circuit will function as a________.

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Question 11

To obtain the given truth table, following logic gate should be placed at G:

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Question 12

Which of the following circuits represents a forward biased diode?

Choose the correct answer from the options given below :

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Question 13

Consider the following statements: A. The junction area of solar cell is made very narrow compared to a photo diode. B. Solar cells are not connected with any external bias. C. LED is made of lightly doped p-n junction. D. Increase of forward current results in continuous increase of LED light intensity. E. LEDs have to be connected in forward bias for emission of light. Choose the correct answer from the options given below:

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Question 14

The output of the circuit is low (zero) for:

$$(A)\; X=0,\,Y=0 \text{ }(B)\; X=0,\,Y=1 \text{ }(C)\; X=1,\,Y=0 \text{ }(D)\; X=1,\,Y=1$$ Choose the correct answer from the options given below:

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Question 15

Which of the following circuits has the same outpur as that of the given circuit?

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Question 16

For the circuit shown above, equivalent GATE is :

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Question 17

The truth table for the circuit given below is :

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Question 18

In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage $$V_{AB}$$ is correctly represented by :

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Question 19

In the given circuit if the power rating of Zener diode is $$10$$ mW, the value of series resistance $$R_s$$ to regulate the input unregulated supply is:

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Question 20

Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be $$\frac{X}{8}$$ eV. The value of X is: (Given $$h = 6.6 \times 10^{-34}$$ J s, $$e = 1.6 \times 10^{-19}$$ C)

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Question 21

Which of the following circuits is reverse-biased?

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Question 22

The truth table of the given circuit diagram is :

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Question 23

The truth table for this given circuit is:

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Question 24

A Zener diode of breakdown voltage $$10 \text{ V}$$ is used as a voltage regulator as shown in the figure. The current through the Zener diode is

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Question 25

In the given circuit, the voltage across load resistance $$(R_L)$$ is:

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Question 26

Identify the logic operation performed by the given circuit.

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Question 27

The output of the given circuit diagram is

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Question 28

Identify the logic gate given in the circuit:

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Question 29

Which of the diode circuit shows correct biasing used for the measurement of dynamic resistance of p-n junction diode:

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Question 30

The output $$(Y)$$ of logic circuit given below is 0 only when

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Question 31

Following gates section is connected in a complete suitable circuit.

For which of the following combination, bulb will glow (ON) :

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Question 32

Given below are two statements: Statement I : Bromination of phenol in solvent with low polarity such as $$CHCl_3$$ or $$CS_2$$ requires Lewis acid catalyst. Statement II : The Lewis acid catalyst polarises the bromine to generate $$Br^+$$. In the light of the above statements, choose the correct answer from the options given below :

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Question 33

The correct truth table for the following logic circuit is :

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Question 34

Given below are two statements : Statement I : Picric acid is 2,4,6 - trinitrotoluene. Statement II : Phenol - 2,4 - disulphonic acid is treated with Conc. $$HNO_3$$ to get picric acid. In the light of the above statements, choose the most appropriate answer from the options given below :

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Question 35

In Reimer - Tiemann reaction, phenol is converted into salicylaldehyde through an intermediate. The structure of intermediate is _____

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Question 36

The acceptor level of a p-type semiconductor is $$6 \text{ eV}$$. The maximum wavelength of light which can create a hole would be : Given $$hc = 1242 \text{ eVnm}$$.