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Physics - Semiconductors

Practise 77 AIIMS previous year questions on Semiconductors, compiled from papers spanning 2001 to 2019. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AIIMS tests.

Semiconductors has been asked in 19 of the 19 years of AIIMS papers analysed (2001–2019), with 77 questions in all. 69% of them were easy, 27% moderate and 4% tough. Most of its questions came from 2005, with 8 questions that year. In the last three years (2017–2019) it had 17 questions across 5 papers, about 3.4 per paper.

The chapter's 7 topics are not weighted equally: Junction Transistors (25 questions, 32%), Diodes (16 questions, 21%), and Logic gates (15 questions, 19%) have been asked the most. Junction Transistors has produced the most tough questions (3).

  1. 1If voltage across zener diode is , then find out the value of maximum resistance in this condition.26 May, 2019Diodes
  2. 2In an transistor (in common emitter mode) electrons enter the emitter in s. Only of the electrons are lost in the base. Calculate the curren26 May, 2019Junction Transistors
  3. 3The waveforms and given below are given as input to a NAND gate. Then its logic output is26 May, 2019Logic gates
  4. 4The given transistor operates in saturation region then what should the be value of volt, volt,25 May, 2019Junction Transistors
  5. 5Assertion : Photodiode and solar cell work on the same principle. Reason : Area is large for solar cell.25 May, 2019Special purpose diodes
  6. 6Assertion : Electron has higher mobility than hole in a semiconductor. Reason : Mass of electron is less than the mass of hole.25 May, 2019Semiconductors
  7. 7Assertion : The logic gate NOT can be built using diode. Reason : The output voltage and input voltage of the diode have phase difference.25 May, 2019Logic gates
  8. 8An unknown transistor needs to be identified as a or type. A multimeter, with +ve and -ve terminals, is used to measure resistance between d27 May, 2018Junction Transistors
  9. 9Assume that each diode shown in the figure has a forward bias resistance of and an infinite reverse bias resistance. The current through the27 May, 2018Diodes
  10. 10Assertion : In a common emitter amplifier, the load resistance of the output circuit is 1000 times the resistance of the input circuit. If 027 May, 2018Junction Transistors
  11. 11Assertion : Gallium arsenide phosphide is used for making LED. Reason: Valanceband overlaps with conduction band in case of semionductor.27 May, 2018Special purpose diodes
  12. 12Output of the given circuit is26 May, 2018Logic gates
  13. 13In a common emitter (CE) amplifier having a voltage gain , the transistor used has transconductance 0.03 mho and current gain 25. If this tr26 May, 2018Junction Transistors
  14. 14If current in diode is five times that in . Breadkdown voltage of diode is 6 volt. Find the value of .26 May, 2018Diodes
  15. 15In the circuit shown in figure, when the input voltage of the base resistance is is zero and is also zero. Value of is2017Junction Transistors
  16. 16In the circuit shown in figure, if the diode forward voltage is , the voltage difference between and is2017Diodes
  17. 17Assertion : An -type semiconductor has a large number of electrons but still it is electrically neutral. Reason: An -type semiconductor is o2017Semiconductors
  18. 18A zener diode is specified as having a breakdown voltage of , with a maximum power dissipation of . What is the maximum current the diode ca2016Diodes
  19. 19A transistor connected at common emitter mode contains load resistance of and an input resistance of . If the input peak voltage is and the 2016Junction Transistors
  20. 20The output for the given, circuit is2016Logic gates
  21. 21If the plate resistance oftriode valve is and amplification factor is 21 . The mutual conductance will be2015Diodes
  22. 22The current gain for a transistor working as common-base amplifier is 0.96 . If the emitter current is , then base current is2015Junction Transistors
  23. 23Assertion : A junction with reverse bias can be used as a photo-diode to measure light intensity. Reason : In a reverse bias condition the c2015Diodes
  24. 24Assertion : The output voltage and the input voltage of the NOT gate have phase difference. Reason : The logic NOT can be built using diode.2015Logic gates
  25. 25Assertion : In a common emitter transistor amplifier, the input current is much less than the output current than output impedance. Reason :2015Junction Transistors
  26. 26Which logic gate is represented by the following combination of logic gates in figure?2014Logic gates
  27. 27Which of the given statements about transistor is not true?2014Junction Transistors
  28. 28Assertion : The resistance of a junction of a spoiled transistor is low when forward biased or reverse biased. Reason: The resistance of a j2014Junction Transistors
  29. 29In an intrinsic semiconductor band gap is then ratio of number of charge carriers at and is2013Energy Bands in Solids
  30. 30The circuit as shown in figure, the equivalent gate is2013Logic gates
  31. 31Which of the following current must be zero in an unbiased junction diode?2012Diodes
  32. 32In the given circuit, the voltage across the load is maintained at . The current in the zener diode varies from . What is the maximum wattag2012Diodes
  33. 33For a common-emitter transistor, input current is circuit is operated at load resistance of , then voltage across collector emitter will be2012Junction Transistors
  34. 34Direction of electric field in junction diode is2011Diodes
  35. 35Assertion : Photodiode and photovoltaic cell are based on the same principle. Reason : Both use same method of operations to work.2011Special purpose diodes
  36. 36Assertion : Transistor can be used as a switch. Reason: Both linear and non-linear voltage bias dependance occurs in it.2011Junction Transistors
  37. 37The logic gate represented in following figure is2010Logic gates
  38. 38Assertion : A pure semiconductor has negative temperature coefficient of resistance. Reason : On raising the temperature, more charge carrie2010Semiconductors
  39. 39Assertion : At a fixed temperature, silicon will have a minimum conductivity when it has a smaller acceptor doping. Reason : The conductivit2010Semiconductors
  40. 40When the inputs of a two input logic gate are 0 and 0 , the output is 1 . When the inputs are 1 and 0 , the output is zero. The type of logi2009Logic gates
  41. 41In the given circuit, the potential difference between and is2009Diodes
  42. 42Assertion : A photocell is called an electric eye. Reason : When light is incident on some semiconductor its electrical resistance is reduce2009Special purpose diodes
  43. 43Assertion : In a common-emitter amplfier, the load resistance of the output circuit is 1000 times the load resistance of the input circuit. 2009Junction Transistors
  44. 44Assertion : Most amplifiers use common emitter circuit configuration. Reason : Its input resistance is comparatively higher.2009Junction Transistors
  45. 45A Ge specimen is doped with Al. The concentration of acceptor atoms is \( 10^{21}\) atoms \(/ {m}^3\). Given that the intrinsic concentratio2008Semiconductors
  46. 46The forbidden gap in the energy bands of silicon is2008Energy Bands in Solids
  47. 47Which of the following gates correspond to the truth table given below? \[ {array}{|c|c|c|} A & B & Y \\ 0 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 0 & 02008Logic gates
  48. 48If collector current is \(120 {~mA}\) and base current is \(2 {~mA}\) and resistance gain is 3 , what is power gain?2007Junction Transistors
  49. 49Zener diode acts as a/an2007Diodes
  50. 50In the half wave rectifier circuit operating from \(50 {~Hz}\) mains frequency, the fundamental frequency in the ripple would be2007Rectifier

Frequently Asked Questions

1.How many questions are available for Semiconductors?

This chapter includes 77 questions compiled from AIIMS papers spanning 2001 to 2019.

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

These are AIIMS questions specifically for the Semiconductors chapter. Questions from other exams like NEET or JIPMER are organised separately under their respective exam sections.

3.Is Semiconductors an important chapter for AIIMS Physics?

Semiconductors has appeared in 19 of the 19 years of AIIMS papers covered here, with 77 questions across 21 papers - about 4 per paper it appears in.

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

Of the 77 questions analysed for this chapter, 69% are easy, 27% moderate and 4% tough. 2005 had the most, with 8 questions.

5.Which topics in Semiconductors should I focus on?

These topics have carried the most weightage in Semiconductors:

  • Junction Transistors - 25 questions (32%)
  • Diodes - 16 questions (21%)
  • Logic gates - 15 questions (19%)
  • Junction Transistors has produced the most tough questions (3).
6.Is Semiconductors's weightage in AIIMS going up or down?

Across all 21 papers analysed, Semiconductors has averaged about 3.7 questions per paper. In the last three years (2017–2019), that average has stayed about the same, at about 3.4 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.