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Saturday, 31 October

JEE Main · Physics · Semiconductor Electronics: Materials, Devices and Simple Circuits

Current Gains Alpha and Beta

JEE Main asked Current Gains Alpha and Beta 4 times in 4 of the 108 shifts Lumi analysed, in 2021 and 2023. It belongs to Transistors, in Semiconductor Electronics: Materials, Devices and Simple Circuits (Physics). The longest wait between two years asking it was 2 years. In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
2 of 8
First asked
2021
last in 2023
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021 and 2023. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.050.10’170’200.10’210’220.07’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 3 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20250 of 8
  • 20240 of 18
  • 20231 of 12
  • 20220 of 24
  • 20213 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: calculation.

  • Current gain from collector and base change
  • Relation between alpha and beta

Difficulty

Easy 4Medium 0Hard 0

Every question was multiple choice.

Every question

All 4 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 12 Apr 2023, Shift 1 · Q49In an n-p-n common emitter (CE) transistor the collector current changes from 5 mA to 16 mA for the change in base current from 100 μ\muA…EasySingle correct
  2. 18 Mar 2021, Shift 2 · Q15The correct relation between α\alpha (ratio of collector current to emitter current) and β\beta (ratio of collector current to base…EasySingle correct
  3. 24 Feb 2021, Shift 1 · Q16If an emitter current is changed by 4 mA, the collector current changes by 3.5 mA. The value of β\beta will be :EasySingle correct
  4. 27 Aug 2021, Shift 2 · Q17For a transistor α\alpha and β\beta are given as α=ICIE\alpha=\frac{I_C}{I_E} and β=ICIB\beta=\frac{I_C}{I_B}. Then the correct relation between…EasySingle correct

Shifts: 24 Feb 2021, Shift 1, 18 Mar 2021, Shift 2, 27 Aug 2021, Shift 2, 12 Apr 2023, Shift 1.

Same topic

Other ideas in Transistors

Transistors has 10 ideas JEE Main has asked; 4 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas