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Physics - Semiconductors

Practise 64 COMEDK previous year questions on Semiconductors, compiled from papers spanning 2012 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 COMEDK tests.

Semiconductors has been asked in 14 of the 15 years of COMEDK papers analysed (2012–2026), with 64 questions in all. 55% of them were easy, 44% moderate and 2% tough. Most of its questions came from 2025, with 11 questions that year. In the last three years (2024–2026) it had 28 questions across 10 papers, about 2.8 per paper.

The chapter's 7 topics are not weighted equally: Diodes (25 questions, 39%), Semiconductors (11 questions, 17%), and Logic gates (9 questions, 14%) have been asked the most. Diodes has also led over the last five years, with 15 questions. Junction Transistors has produced the most tough questions (1).

  1. 1Genetic Engineering is related to the principle of09 May, 2026 (S1)Logic gates
  2. 2A silicon sample is doped simultaneously with donor impurity phosphorus at a concentration of and acceptor impurity boron at a concentration09 May, 2026 (S1)Semiconductors
  3. 3In a PN junction diode, the forward bias is increased gradually from 0 Volt to 1 Volt. Which of the following statements is correct?09 May, 2026 (S1)Diodes
  4. 4In the circuit given, the reverse breakdown voltage of the Zener diode is 4.8 V. The current through the Zener and the power dissipation in 09 May, 2026 (S1)Diodes
  5. 5Pick out the correct statement from the following;09 May, 2026 (S2)Energy Bands in Solids
  6. 6What is the minimum wavelength of radiation required to detect a p-n junction diode made of a semiconductor having band gap 3.3 eV. [Planck'09 May, 2026 (S2)Energy Bands in Solids
  7. 7In the given circuit, if the barrier potential across the diode is 0.5 V , the current in the circuit is:25 May, 2025 (Shift)Diodes
  8. 8A photodiode fabricated from lead Selenide has a band gap energy of 0.27 eV . What is the wavelength of the signal the photodiode can detect25 May, 2025 (Shift)Energy Bands in Solids
  9. 9Which of the following is incorrect? A. Fermi level is the energy possessed by an electron at zero kelvin. B. Fermi level for an extrinsic s25 May, 2025 (Shift)Semiconductors
  10. 10The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than is incident on it. The ba10 May, 2025 (S1)Energy Bands in Solids
  11. 11In the energy band diagram of a material shown below, open circles and filled circles denote holes and electrons respectively. The material 10 May, 2025 (S1)Semiconductors
  12. 12A Si and a Ge diode has identical physical dimensions. The band gap in Si is larger than that in Ge. On applying identical reverse bias acro10 May, 2025 (S1)Diodes
  13. 13Three ideal diodes and resistors connected to the cell of negligible internal resistance is as shown. Find the current passing through the r10 May, 2025 (S2)Diodes
  14. 14Diamond is considered as an insulator because10 May, 2025 (S2)Energy Bands in Solids
  15. 15What is the dc component of the output voltage if a sinusoidal signal of 33 V peak voltage is the input of a half wave diode rectifier circu10 May, 2025 (S3)Rectifier
  16. 16An intrinsic semiconductor has equal concentrations of hole and electron which is equal to . During its conversion to extrinsic semiconducto10 May, 2025 (S3)Semiconductors
  17. 17The zener voltage in the circuit shown is . The load resistance and the resistance . If the input voltage is , then the current through the 10 May, 2025 (S3)Diodes
  18. 18A semiconductor is made by doping silicon with phosphorous. A second semiconductor is made by doping silicon with aluminium. The two are joi2024 (Afternoon Shift)Diodes
  19. 19In intrinsic semiconductors at room temperature, number of electrons and holes are2024 (Afternoon Shift)Semiconductors
  20. 20Preview not available - open to view this question.2024 (Afternoon Shift)Diodes
  21. 21The conductivity of a semiconductor increases with increase in temperature because A) number density of free current carriers increases B) r2024 (Evening Shift)Semiconductors
  22. 22The output of the given circuit is A. Negatively rectified half wave B. Positively rectified half wave C. Negatively rectified full wave D. 2024 (Evening Shift)Diodes
  23. 23The following are the graphs of potential barrier versus width of the depletion region for a p-n junction diode. Which of the following is c2024 (Evening Shift)Diodes
  24. 24In forward biasing of a junction,2024 (Memory Based)Diodes
  25. 25Two diodes of silicon and germanium are connected in series as shown below. The current flowing through the circuit will be around2024 (Memory Based)Diodes
  26. 26In a given semiconductor, the ratio of the number density of electron to number density of hole is . If th of the total current is due to th2024 (Morning Shift)Semiconductors
  27. 27Though and are group elements, is a metal while is a semiconductor because2024 (Morning Shift)Energy Bands in Solids
  28. 28An ideal diode is connected in series with a capacitor. The free ends of the capacitor and the diode are connected across a ac source. Now t2024 (Morning Shift)Diodes
  29. 29In the given circuit, assuming the battery is oriented with its positive terminal on the right, the diode and have the forward resistance an2023 (Evening Shift)Diodes
  30. 30The reverse current in the semiconductor diode changes from to when the reverse potential is changed from to , then the reverse resistance o2023 (Evening Shift)Diodes
  31. 31The energy gap between valance band and the conduction band for a given material is , then the material is :2023 (Evening Shift)Energy Bands in Solids
  32. 32A transistor is connected in configuration. The collector supply is and the voltage drop across a resistor of in the collector circuit is . 2023 (Memory Based)Junction Transistors
  33. 33Which logic gate is represented by the following combination of logic gates?2023 (Memory Based)Logic gates
  34. 34An LED is constructed from a junction diode using GaAsP. The energy gap is . The wavelength of the light emitted will be equal to2023 (Memory Based)Energy Bands in Solids
  35. 35A transistor is connected in CE configuration. The collector supply is and the voltage drop across a resistor of in the collector circuit is2023 (Morning Shift)Junction Transistors
  36. 36Which logic gate is represented by the following combination logic gates?2023 (Morning Shift)Logic gates
  37. 37An LED is constructed from a - junction diode using GaAsP. The energy gap is . The wavelength of the light emitted will be equal to2023 (Morning Shift)Special purpose diodes
  38. 38For CE transistor amplifier, the audio signal voltage across the collector resistance of is . If the current amplification factor of the tra2022Junction Transistors
  39. 39Which of the following gate give the similar output as the output of circuit diagram shown in the figure?2022Logic gates
  40. 40Choose the incorrect statements.2022Special purpose diodes
  41. 41Find the logic gate, when both the inputs are high but the output is low and vice-versa.2021Logic gates
  42. 42What is the minimum band-gap of the LED diode?2021Diodes
  43. 43An optical fibre communication system works on a wavelength of . The number of subscribers it can feed, if a channel requires are2021Semiconductors
  44. 44When a - junction diode is connected in forward bias, its barrier potential2020Semiconductors
  45. 45The emitter-base junction of a transistor is ....... biased, while the collector-base junction is ....... biased.2019Diodes
  46. 46In a forward biased -n junction diode, the potential barrier in the depletion region is of the form2019Diodes
  47. 47In an unbiased - junction2018Diodes
  48. 48To get an output from the circuit shown, the inputs and must be respectively2018Logic gates
  49. 49If the forward voltage in a diode is increased, then the width of the depletion region2017Diodes
  50. 50Identify the property which is not characteristic for a semi-conductor.2017Semiconductors

Frequently Asked Questions

1.How many questions are available for Semiconductors?

This chapter includes 64 questions compiled from COMEDK papers spanning 2012 to 2026.

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

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

3.Is Semiconductors an important chapter for COMEDK Physics?

Semiconductors has appeared in 14 of the 15 years of COMEDK papers covered here, with 64 questions across 23 papers - about 3 per paper it appears in.

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

Of the 64 questions analysed for this chapter, 55% are easy, 44% moderate and 2% tough. 2025 had the most, with 11 questions.

5.Which topics in Semiconductors should I focus on?

These topics have carried the most weightage in Semiconductors:

  • Diodes - 25 questions (39%)
  • Semiconductors - 11 questions (17%)
  • Logic gates - 9 questions (14%)
  • Junction Transistors has produced the most tough questions (1).
6.Is Semiconductors's weightage in COMEDK going up or down?

Across all 23 papers analysed, Semiconductors has averaged about 2.8 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 2.8 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.