NEET UG · Physics · Semiconductor Electronics: Materials, Devices and Simple Circuits

Semiconductor Devices: NEET previous year questions

17 questions in ten years of NEET, in 10 of 10 papers. Pattern: Every year. Here is how it is asked and which ideas come back.

Asked in 10 years: 17; about 1.6 per paper
Years asked: 10/10; last asked 2026
Chance of a question next paper: 84%; historical rate, how we compute it
Weighted estimate: 1.6; model; history: 1.6 a paper on average, typically 1–2

Key findings

01
Asked in 10 of 10 papers, 17 questions in all: #22 of 204 topics by ten-year total.
02
33% of its questions since 2018 tested an idea never asked before; 3 repeated an idea from the year before.
03
The most repeated idea is p-n Junction: Depletion Region and Biasing, asked 4 times (2017, 2020, 2022, 2026), usually as “effect of bias on depletion region”.
04
NEET has asked 0 of the 8 ideas in this topic; 0 have never been asked, directly or indirectly.
05
Mostly asked as figure-based (41%); 53% easy, 0% hard, and down from 1.8 to 1.3 questions a paper since 2024.

Questions per year

Up to 2023: 1.8; per paper
Since 2024: 1.3; -0.5
Usual gap: 1.0 yrs; between papers asking it
Swing: ±0.5; questions, year to year

Recent framings

depletion width of diodes in different biasing
voltage across resistor with Zener diode
diode biasing in full wave rectifier

Revise first

p-n Junction: Depletion Region and Biasing (2017 2020 2022 2026); Rectifiers and Filters (2022 2023 2025); Zener Diode as Voltage Regulator (2021 2026)

How it is asked

Difficulty, format and skill

Across all 17 questions on Semiconductor Devices since 2017.

Difficulty

QUESTIONS

Easy9 · 53%
Medium8 · 47%
Hard0 · 0%

Format

Figure-based · 7 Q41%
One-line MCQ · 7 Q41%
Two statements · 1 Q6%
Other · 1 Q6%
Numerical · 1 Q6%

Skill tested

Recall · 7 Q41%
Concept · 5 Q29%
Application · 3 Q18%
Calculation · 2 Q12%

Repeats

New idea, or one asked before?

Each column is a paper. Blue questions tested an idea NEET had not asked before; navy ones went back to an idea from an earlier paper. 2017 is the first paper, so everything in it counts as new.

’17’18’19’20’21’22’23’24’25’26

Idea asked for the first time
Idea asked in an earlier paper

Coverage of the topic

NEET has asked 0 of the 8 ideas in this topic. 0 have never been asked yet.

Asked directly0 · 0%
Touched inside another question8 · 100%
Never asked0 · 0%

Ideas come from Lumi’s syllabus map of NCERT. A never-asked idea is not a safe skip: most new questions come from exactly these.

Drill down

Idea, year, question

Every idea NEET tested in this topic, with its ten papers. Open one to read the questions.

ideaAskedShareYears’17’18’19’20’21’22’23’24’25’26

Repeated4 · 24%24%4/10
- 2026 · Q42
  Three identical p-n junction diodes $D_1$ , $D_2$ and $D_3$ are connected across a battery as shown in the figure. If the width of the…
  mediumFigure-based
- 2022 · Q23
  [Figure: circuits (a), (b), (c)] In the given circuits (a), (b) and (c), the potential drop across the two p-n junctions are equal in :
  mediumFigure-based
- 2020 · Q153
  The increase in the width of the depletion region in a p-n junction diode is due to :
  easyOne-line MCQ
- 2017 · Q22
  Which one of the following represents forward bias diode ?
  easyFigure-basedNew idea
Repeated3 · 18%18%3/10
Repeated3 · 18%18%3/10
Repeated2 · 12%12%2/10
Repeated2 · 12%12%2/10
Repeated2 · 12%12%2/10
1 · 6%6%1/10

Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.

Ideas

Every idea inside this topic

7 different ideas were tested; 6 came more than once.

p-n Junction: Depletion Region and Biasing4×
effect of bias on depletion region
Figure-based · 11% next
Rectifiers and Filters3×
identify component in rectifier circuit
One-line MCQ · 11% next
Bipolar Junction Transistor3×
numerical
Figure-based · 6% next
Zener Diode as Voltage Regulator2×
statement i/ii on diodes
Figure-based · 6% next
Photodiodes, LEDs and Solar Cells2×
statement i/ii on special purpose diodes
Figure-based · 6% next
Intrinsic and Extrinsic Semiconductors2×
compare currents in n-type and p-type
One-line MCQ · 6% next
p-n Junction V-I Characteristics1×
effect of temperature on p-n junction
One-line MCQ · 4% next

Idea	Times	Format	Chance next	Foundation for
p-n Junction: Depletion Region and Biasingeffect of bias on depletion region	4	Figure-basedConcept	11%	–
Rectifiers and Filtersidentify component in rectifier circuit	3	One-line MCQRecall	11%	–
Bipolar Junction Transistornumerical	3	Figure-basedCalculation	6%	–
Zener Diode as Voltage Regulatorstatement i/ii on diodes	2	Figure-basedApplication	6%	–
Photodiodes, LEDs and Solar Cellsstatement i/ii on special purpose diodes	2	Figure-basedConcept	6%	–
Intrinsic and Extrinsic Semiconductorscompare currents in n-type and p-type	2	One-line MCQConcept	6%	–
p-n Junction V-I Characteristicseffect of temperature on p-n junction	1	One-line MCQConcept	4%	–

Chance next is the historical rate at which an idea with this record came back in the following paper. It is low for every idea, which is why learning the topic beats memorising past questions. All repeated ideas

Every question

Semiconductor Devices questions, year by year

The opening words of each question as it appeared in the official paper, with the idea it tested.

NEET 20262 questions

Q16
An ideal Zener diode with breakdown voltage of $-3$ V is reverse biased with a negative input voltage $V_i=-5$ V. The magnitude of voltage…
Idea: Zener Diode as Voltage Regulator
MediumFigure-based · figure
Q42
Three identical p-n junction diodes $D_1$ , $D_2$ and $D_3$ are connected across a battery as shown in the figure. If the width of the…
Idea: p-n Junction: Depletion Region and Biasing
MediumFigure-based · figure

NEET 20251 question

Q40
A full wave rectifier circuit with diodes ( $D_1$ ) and ( $D_2$ ) is shown in the figure. If input supply voltage $V_{in} = 220\sin(100\pi t)$ …
Idea: Rectifiers and Filters
MediumFigure-based · figure

NEET 20241 question

Q4
Consider the following statements A and B and identify the correct answer : [graph: I vs V axes with quadrants (I)-(IV)] A. For a…
Idea: Photodiodes, LEDs and Solar Cells
Asked last yearMediumFigure-based · figure

NEET 20232 questions

Q5
A full wave rectifier circuit consists of two p-n junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of…
Idea: Rectifiers and Filters
Asked last yearEasyOne-line MCQ
Q16
Given below are two statements: Statement I : Photovoltaic devices can convert optical radiation into electricity. Statement II : Zener…
Idea: Photodiodes, LEDs and Solar Cells
New ideaEasyTwo statements

NEET 20222 questions

Q1
In half wave rectification, if the input frequency is 60 Hz, then the output frequency would be :
Idea: Rectifiers and Filters
New ideaEasyOne-line MCQ
Q23
[Figure: circuits (a), (b), (c)] In the given circuits (a), (b) and (c), the potential drop across the two p-n junctions are equal in :
Idea: p-n Junction: Depletion Region and Biasing
MediumFigure-based · figure

NEET 20212 questions

Q21
The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field…
Idea: Intrinsic and Extrinsic Semiconductors
MediumOne-line MCQ
Q32
Consider the following statements (A) and (B) and identify the correct answer. (A) A zener diode is connected in reverse bias, when used…
Idea: Zener Diode as Voltage Regulator
New ideaEasyOther

NEET 20202 questions

Q153
The increase in the width of the depletion region in a p-n junction diode is due to :
Idea: p-n Junction: Depletion Region and Biasing
EasyOne-line MCQ
Q156
For transistor action, which of the following statements is correct ?
Idea: Bipolar Junction Transistor
EasyOne-line MCQ

NEET 20191 question

Q18
For a p-type semiconductor, which of the following statements is true ?
Idea: Intrinsic and Extrinsic Semiconductors
New ideaEasyOne-line MCQ

NEET 20182 questions

Q15
In the circuit shown in the figure, the input voltage $V_i$ is 20 V, $V_{BE} = 0$ and $V_{CE} = 0$ . The values of $I_B$ , $I_C$ and $\beta$ …
Idea: Bipolar Junction Transistor
Asked last yearMediumFigure-based · figure
Q16
In a p-n junction diode, change in temperature due to heating
Idea: p-n Junction V-I Characteristics
New ideaEasyOne-line MCQ

NEET 20172 questions

Q21
In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 k $\Omega$ .…
Idea: Bipolar Junction Transistor
MediumNumerical
Q22
Which one of the following represents forward bias diode ?
Idea: p-n Junction: Depletion Region and Biasing
EasyFigure-based · figure

Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.