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Physics - Semiconductors

Practise 247 JEE Main previous year questions on Semiconductors, compiled from papers spanning 2002 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Main tests.

Semiconductors has been asked in 24 of the 25 years of JEE Main papers analysed (2002–2026), with 247 questions in all. 51% of them were easy, 41% moderate and 8% tough. Most of its questions came from 2021, with 42 questions that year. In the last three years (2024–2026) it had 49 questions across 49 papers, about 1 per paper.

The chapter's 8 topics are not weighted equally: Diodes (85 questions, 34%), Logic gates (82 questions, 33%), and Junction Transistors (42 questions, 17%) have been asked the most. Over the last five years the most frequent topics have been Logic gates (44), Diodes (37), and Junction Transistors (14). Diodes has produced the most tough questions (11).

  1. 1The output for the given inputs and to the circuit is:08 Apr, 2026 (E)Logic gates
  2. 2The maximum rated power of the LED is mW and it is used in the circuit with input voltage of V as shown in the figure below. The current thr06 Apr, 2026 (M)Diodes
  3. 3Refer to the logic circuit given below. For two inputs and , output will be __________.06 Apr, 2026 (E)Logic gates
  4. 4For the given logic circuit, which of the following inputs combination will make both LED and LED to glow?05 Apr, 2026 (M)Logic gates
  5. 5In a semiconductor p-n diode, the doping concentrations on p-side and n-side are and , respectively. Which one of the following statements i05 Apr, 2026 (E)Diodes
  6. 6Two bits binary numbers, and are given in the inputs of a logic circuit shown in figure below. The output will be:04 Apr, 2026 (M)Logic gates
  7. 7Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: A diode under reverse-bias04 Apr, 2026 (E)Diodes
  8. 8A diode has Zener voltage of V and maximum power dissipation of W, then the minimum resistance to be used in series with this diode for safe04 Apr, 2026 (E)Diodes
  9. 9For the given circuit (shown in part (A)) the time dependent input voltage and corresponding output are shown in part (B) and part (C), resp02 Apr, 2026 (M)Diodes
  10. 10If and are the inputs, the given circuit works as _______.02 Apr, 2026 (E)Logic gates
  11. 11Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon diode, the current through diode in the circuit is mA. 28 Jan, 2026 (M)Diodes
  12. 12Two p-n junction diodes and are connected as shown in figure. and are input signals and is the output. The given circuit will function as a 28 Jan, 2026 (E)Logic Gates
  13. 13A voltage regulating circuit consisting of Zener diode, having break-down voltage of 10 V and maximum power dissipation of 0.4 W, is operate24 Jan, 2026 (M)Diodes
  14. 14Identify the correct truth table of the given logic circuit.24 Jan, 2026 (E)Logic gates
  15. 15The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at and the desired current in load is 5 mA. The u23 Jan, 2026 (M)Diodes
  16. 16For the given logic gate circuit, which of the following is the correct truth table?23 Jan, 2026 (E)Logic gates
  17. 17Find the correct combination of and D inputs which can cause the LED to glow.22 Jan, 2026 (M)Logic gates
  18. 18The correct truth table for the given input data of the following logic gate is : Inputs22 Jan, 2026 (E)Logic gates
  19. 19The given circuit works as :21 Jan, 2026 (M)Logic gates
  20. 20The output voltage in the following circuit is (Consider ideal diode case)08 Apr, 2025 (E)Diodes
  21. 21In the following circuit, the reading of the ammeter will be (Take Zener breakdown voltage07 Apr, 2025 (M)Diodes
  22. 22Consider the following logic circuit. The output is when :07 Apr, 2025 (E)Logic gates
  23. 23The Boolean expression can be realised with which of the following gate configurations. A. One 3-input AND gate, 3 NOT gates and one 2input 04 Apr, 2025 (M)Logic gates
  24. 24Consider a n-type semiconductor in which and are number of electrons and holes, respectively. (A) Holes are minority carriers (B) The dopant04 Apr, 2025 (E)Semiconductors
  25. 25Choose the correct logic circuit for the given truth table having inputs A and B.03 Apr, 2025 (M)Logic gates
  26. 26The truth table corresponding to the circuit given below is03 Apr, 2025 (E)Logic gates
  27. 27A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a resistor connected in series, the ze02 Apr, 2025 (M)Diodes
  28. 28In the digital circuit shown in the figure, for the given inputs the P and Q values are :02 Apr, 2025 (E)Logic gates
  29. 29For the circuit shown above, equivalent GATE is :29 Jan, 2025 (M)Logic gates
  30. 30The truth table for the circuit given below is :29 Jan, 2025 (E)Logic gates
  31. 31Which of the following circuits has the same outpur as that of the given circuit?28 Jan, 2025 (M)Logic gates
  32. 32In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage is correctly represented by :28 Jan, 2025 (E)Diodes
  33. 33Consider the following statements: A. The junction area of solar cell is made very narrow compared to a photo diode. B. Solar cells are not 24 Jan, 2025 (M)Special purpose diodes
  34. 34The output of the circuit is low (zero) for : (A) (B) (C) (D) Choose the correct answer from the options given below :24 Jan, 2025 (E)Logic gates
  35. 35Refer to the circuit diagram given in the figure. which of the following observations are correct? A. Total resistance of circuit is B. Curr23 Jan, 2025 (M)Diodes
  36. 36Which of the following circuits represents a forward biased diode? Choose the correct answer from the options given below :22 Jan, 2025 (M)Diodes
  37. 37{array}{c|c|c} A & B & Y \\ 0 & 0 & 1 \\0 & 1 & 1 \\1 & 0 & 0 \\1 & 1 & 1 {array} To obtain the given truth table, following logic gate shou22 Jan, 2025 (E)Logic gates
  38. 38A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is . The wavelength of light emitted from the L09 Apr, 2024 (M)Energy Bands in Solids
  39. 39The characteristics of an electronic device shown in the figure. The device is:09 Apr, 2024 (E)Special purpose diodes
  40. 40In the truth table of the above circuit the value of and are :09 Apr, 2024 (E)Logic gates
  41. 41The output of following circuit for given inputs is :08 Apr, 2024 (M)Logic gates
  42. 42A potential divider circuit is connected with a dc source of , a light emitting diode of glow in voltage and a zener diode of breakdown volt08 Apr, 2024 (E)Diodes
  43. 43The correct truth table for the following logic circuit is :06 Apr, 2024 (M)Logic gates
  44. 44The acceptor level of a p-type semiconductor is . The maximum wavelength of light which can create a hole would be : Given .06 Apr, 2024 (E)Energy Bands in Solids
  45. 45Following gates section is connected in a complete suitable circuit.05 Apr, 2024 (M)Logic gates
  46. 46The output of logic circuit given below is 0 only when :05 Apr, 2024 (E)Logic gates
  47. 47The value of net resistance of the network as shown in the given figure is :04 Apr, 2024 (M)Diodes
  48. 48Identify the logic gate given in the circuit:04 Apr, 2024 (E)Logic gates
  49. 49Which of the diode circuit shows correct biasing used for the measurement of dynamic resistance of p-n junction diode :04 Apr, 2024 (E)Diodes
  50. 50In 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 supp01 Feb, 2024 (M)Diodes

Frequently Asked Questions

1.How many questions are available for Semiconductors?

This chapter includes 247 questions compiled from JEE Main papers spanning 2002 to 2026.

2.Are these questions only from JEE Main, or from other exams too?

These are JEE Main questions specifically for the Semiconductors chapter. Questions from other exams like NTA Abhyas (JEE Main) or JEE Advanced are organised separately under their respective exam sections.

3.Is Semiconductors an important chapter for JEE Main Physics?

Semiconductors has appeared in 24 of the 25 years of JEE Main papers covered here, with 247 questions across 192 papers - about one per paper it appears in.

4.What is the difficulty level of Semiconductors questions in JEE Main?

Of the 247 questions analysed for this chapter, 51% are easy, 41% moderate and 8% tough. 2021 had the most, with 42 questions.

5.Which topics in Semiconductors should I focus on?

These topics have carried the most weightage in Semiconductors:

  • Diodes - 85 questions (34%)
  • Logic gates - 82 questions (33%)
  • Junction Transistors - 42 questions (17%)
  • Diodes has produced the most tough questions (11).
6.Is Semiconductors's weightage in JEE Main going up or down?

Across all 192 papers analysed, Semiconductors has averaged about 1.3 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.