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Physics - Semiconductors

Practise 37 WBJEE previous year questions on Semiconductors, compiled from papers spanning 2009 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 WBJEE tests.

Semiconductors has been asked in 17 of the 18 years of WBJEE papers analysed (2009–2026), with 37 questions in all. 70% of them were easy, 27% moderate and 3% tough. Most of its questions came from 2026, with 4 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 (14 questions, 38%), Diodes (14 questions, 38%), and Junction Transistors (5 questions, 14%) have been asked the most. Over the last five years the most frequent topics have been Diodes (6), Logic gates (5), and Special purpose diodes (1). Logic gates has produced the most tough questions (1).

  1. 1The I - V characteristics graph shown below is exhibited by2026Special purpose diodes
  2. 2The inputs to a digital circuit are as shown below. The output is2026Logic gates
  3. 3The circuit has two oppositely connected ideal diodes in parallel as shown in the figure. What is the current flowing in the circuit?2026Diodes
  4. 4For Boolean variables and , . Then, which of the following statements is/are correct?2026Logic gates
  5. 5A diode is connected in parallel with a resistance as shown in figure. The most probable current (I) -voltage (V) characteristic is2025Diodes
  6. 6Which logic gate is represented by the following combinations of logic gates?2025Logic gates
  7. 7Manufacturers supply a zener diode with zener voltage and maximum power dissipation . This zener diode is used in the following circuit. Cal2025Diodes
  8. 8A 2 V cell is connected across to points A and B as shown in the figure. Assume that the resistance of each diode is zero in forward bias an2024Diodes
  9. 9In the given network of AND and OR gates, output Q can be written as (assuming n even)2024Logic gates
  10. 10In the given circuit, find the voltage drop \(V_L\) in the load resistance \(R_L\).2023Diodes
  11. 11Consider the logic circuit with inputs A, B, C and output \(Y\). How many combinations of \(A, B\) and \(C\) gives the output \(Y=0\) ?2023Logic gates
  12. 12A Zener diode having break down voltage is used in a voltage regulator circuit as shown in the figure. The minimum current required to pass 2022Diodes
  13. 13What is the value of current through the diode in the circuit given?2021Diodes
  14. 14For the given logic circuit, the output for inputs and respectively are2021Logic gates
  15. 15A common emitter transistor amplifier is connected with a load resistance of . When a small a.c. signal of 15 is added to the base emitter v2020Rectifier
  16. 16In the circuit shown, the value of of the transistor is 48 . If the base current supplied is , what is the voltage at the terminal ?2020Junction Transistors
  17. 17In the circuit shown, what will be the current through the zener?2019Diodes
  18. 18Each of the two inputs and can assume values either 0 or 1. Then which of the following will be equal to2019Logic gates
  19. 19In the circuit shown, inputs and are in states 1 and 0 respectively. What is the only possible stable state of the outputs and2018Logic gates
  20. 20What will be the current flowing through the resistor in the circuit shown, where the breakdown voltage of the Zener is2018Diodes
  21. 21In the given circuit, the binary inputs at and are both 1 in one case and both 0 in the next case. The respective outputs at in these two ca2017Logic gates
  22. 22When a semiconducting device is connected in series with a battery and a resistance, a current is found to flow in the circuit. If however, 2017Diodes
  23. 23A Zener diode having break-down voltage is connected in reverse bias with a battery of emf and a resistance of in series. The current flowin2016Diodes
  24. 24In case of a bipolar transistor . The potential drop across the collector resistance approximately2016Junction Transistors
  25. 25Assume that each diode as shown in the tịgure has a forvard bias resistance of and an infinite reverse bias resistance. The current through 2015Diodes
  26. 26The inputs to the digital circuit are as shown below. The output is2015Logic gates
  27. 27The output Y of the logic circuit given below is2014Logic gates
  28. 28In the bandgap between valence band and conduction band in a material is then the material is2014Energy Bands in Solids
  29. 29In the circuit shown assume the diode to be ideal. When increases from to the change in the current is (in mA)2014Diodes
  30. 30In a transistor output characteristicy commonly used in common emitter configuration, the base current , the collector current and the colle2014Junction Transistors
  31. 31A NOR gate and a NAND gate are connected as shown in the figure. Two different sets of inputs are given to this setup. In the first case, th2013Logic gates
  32. 32In an transistor2013Junction Transistors
  33. 33Which type of Gate the following truth table represents?2011Logic gates
  34. 34In a common emitter configuration, a transistor has and input resistance . If the peak value of a.c. input is then the peak value of collect2010Junction Transistors
  35. 35To write the decimal number 37 in binary, how many binary digits are required?2009Logic gates
  36. 36A junction diode has a resistance of when forward biased and when reverse biased. The current in the diode, for the arrangement shown will b2009Diodes
  37. 37Which of the following materials is the best conductor of electricity?2009Semiconductors

Frequently Asked Questions

1.How many questions are available for Semiconductors?

This chapter includes 37 questions compiled from WBJEE papers spanning 2009 to 2026.

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

These are WBJEE 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 WBJEE Physics?

Semiconductors has appeared in 17 of the 18 years of WBJEE papers covered here, with 37 questions across 17 papers - about 2 per paper it appears in.

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

Of the 37 questions analysed for this chapter, 70% are easy, 27% moderate and 3% tough. 2026 had the most, with 4 questions.

5.Which topics in Semiconductors should I focus on?

These topics have carried the most weightage in Semiconductors:

  • Logic gates - 14 questions (38%)
  • Diodes - 14 questions (38%)
  • Junction Transistors - 5 questions (14%)
  • Logic gates has produced the most tough questions (1).
6.Is Semiconductors's weightage in WBJEE going up or down?

Across all 17 papers analysed, Semiconductors has averaged about 2.2 questions per paper. In the last three years (2024–2026), that average has risen, 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.