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Physics - Semiconductors

Practise 64 KCET previous year questions on Semiconductors, compiled from papers spanning 2007 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 KCET tests.

Semiconductors has been asked in 20 of the 20 years of KCET papers analysed (2007–2026), with 64 questions in all. 67% of them were easy, 28% moderate and 5% tough. Most of its questions came from 2017, with 5 questions that year. In the last three years (2024–2026) it had 9 questions across 3 papers, about 3 per paper.

The chapter's 7 topics are not weighted equally: Logic gates (17 questions, 27%), Diodes (14 questions, 22%), and Junction Transistors (11 questions, 17%) have been asked the most. Over the last five years the most frequent topics have been Diodes (5), Semiconductors (4), and Energy Bands in Solids (4). Diodes has produced the most tough questions (1).

  1. 1An n-type and p-type semiconductor can be obtained by respectively doping pure silicon with2026Semiconductors
  2. 2In which of the following figures, diode is reverse biased?2026Diodes
  3. 3A wafer of pure germanium crystal has two parts X and Y. The end X is obtained by doping with arsenic and Y with indium. It is connected to 2026Semiconductors
  4. 4Which of the following statements is correct for an n-type semiconductor?2025Semiconductors
  5. 5The circuit shown in figure contains two ideal diodes and . If a cell of emf 3 V and negligible internal resistance is connected as shown, t2025Diodes
  6. 6Depletion region in an unbiased semiconductor diode is a region consisting of2024Energy Bands in Solids
  7. 7The upper level of valence band and lower level of conduction band overlap in the case of2024Energy Bands in Solids
  8. 8In the diagram shown, the Zener diode has a reverse breakdown voltage of . The current through the load resistance is . The current through 2024Diodes
  9. 9A junction diode is connected to a battery of emf 5.7 V in series with a resistant such that it is forward biased. If the barrier potential 2024Diodes
  10. 10When a - junction diode is in forward bias, which type of charge carriers flows in the connecting wire?2023Diodes
  11. 11A full-wave rectifier with diodes and is used to rectify alternating voltage. The diode conducts .......... times in one second.2023Rectifier
  12. 12The truth table for the given circuit is2023Logic gates
  13. 13The energy gap of an LED is . When the LED is switched ON, the momentum of the emitted photons is2023Energy Bands in Solids
  14. 14The resistivity of a semiconductor at room temperature is in between2022Semiconductors
  15. 15The forbidden energy gap for Ge crystal at is2022Energy Bands in Solids
  16. 16Which logic gate is represented by the following combination of logic gates ?2022Logic gates
  17. 17The circuit given represents which of the logic operations?2021Logic gates
  18. 18Identify the incorrect statement.2021Diodes
  19. 19Three photodiodes and are made of semiconductors having band gaps of and , respectively. Which one will be able to detect light of wavelengt2021Special purpose diodes
  20. 20A AC supply is connected between points and as shown in figure, what will be the potential difference across the capacitor?2020Diodes
  21. 21In the following circuit what are and2020Logic gates
  22. 22A positive hole in a semiconductor is2020Semiconductors
  23. 23The conductivity of semiconductor increases with increase in temperature because2019Semiconductors
  24. 24For a transistor amplifier, the voltage gain2019Junction Transistors
  25. 25In the following circuit, what are \( P \) and \( Q \) ?2019Logic gates
  26. 26In a CE amplifier, the input ac signal to be amplified is applied across2018Junction Transistors
  27. 27If \( A=1 \) and \( B=0 \), then in terms of Boolean algebra, \( {A}+B= \)2018Logic gates
  28. 28The density of an electron -hole pair in a pure germanium is \( 3 10^{16} {~m}^{-3} \) at room temperature . On doping with aluminium, the h2018Semiconductors
  29. 29The dc common emitter current gain of a n-p-n transistor is 50, The potential difference applied across the collector and emitter of a trans2018Junction Transistors
  30. 30The waves set up in a closed pipe are2017Junction Transistors
  31. 31A galvanometer of resistance \( 50 \) is connected to a battery of \( 3 {~V} \) along with a resistance of \( 2950 \) in series shows full-s2017Energy Bands in Solids
  32. 32The working of magnetic braking of trains is based on2017Diodes
  33. 33If \( {E} \) and \( {B} \) represent electric and magnetic field vectors of an electromagnetic wave, the direction of propagation of the wav2017Special purpose diodes
  34. 34According to Cartesian sign convention, in ray optics2017Logic gates
  35. 35Constant DC voltage is required from a variable AC voltage. Which of the following is correct order of operation?2016Rectifier
  36. 36In a transistor, the collector current varies by \( 0.49 {~mA} \) and emitter current varies by \( 0.50 {~mA} \). Current gain \( \) measure2016Junction Transistors
  37. 37Identify the logic operation carried out by the following circuit.2016Logic gates
  38. 38The ratio of the dimensions of Planck constant and that of moment of inertia has the dimensions of2015Diodes
  39. 39A particle is projected with a velocity \( v \) so that its horizontal range twice the greatest height attained. The horizontal range is2015Special purpose diodes
  40. 40The kinetic energy of a body of mass \( 4 {~kg} \) and momentum \( 6 {Ns} \) will be2015Logic gates
  41. 41The ratio of angular speed of a second-hand to the hour-hand of a watch is2015Junction Transistors
  42. 42The maximum kinetic energy of the photo-electrons depends only on2014Semiconductors
  43. 43Which of the following spectral series of hydrogen atom is lying in visible range of electromagnetic wave ?2014Logic gates
  44. 44What is the energy of the electron revolving in third orbit expressed in \( {eV} \) ?2014Junction Transistors
  45. 45In which of the following statements, the obtained impure semiconductor is of -type?2013Semiconductors
  46. 46The width of the depletion region in a junction diode is2013Diodes
  47. 47When the transistor is used as an amplifier2013Junction Transistors
  48. 48The output of an OR gate is connected to both the inputs of a NAND gate. The combination will serve as2013Logic gates
  49. 49For a transistor, . The value of is2012Junction Transistors
  50. 50The following truth table with and as inputs is for ........ gate.2012Logic gates

Frequently Asked Questions

1.How many questions are available for Semiconductors?

This chapter includes 64 questions compiled from KCET papers spanning 2007 to 2026.

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

These are KCET 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 KCET Physics?

Semiconductors has appeared in 20 of the 20 years of KCET papers covered here, with 64 questions across 20 papers - about 3 per paper it appears in.

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

Of the 64 questions analysed for this chapter, 67% are easy, 28% moderate and 5% tough. 2017 had the most, with 5 questions.

5.Which topics in Semiconductors should I focus on?

These topics have carried the most weightage in Semiconductors:

  • Logic gates - 17 questions (27%)
  • Diodes - 14 questions (22%)
  • Junction Transistors - 11 questions (17%)
  • Diodes has produced the most tough questions (1).
6.Is Semiconductors's weightage in KCET going up or down?

Across all 20 papers analysed, Semiconductors has averaged about 3.2 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 3.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.