NEET UG · Physics · Class 12

Semiconductor Electronics: Materials, Devices and Simple Circuits: NEET previous year questions

27 questions in ten years of NEET, asked in 10 of 10 years. Here is what this chapter tests and how.

Asked in 10 years: 27; 10 of 10 papers
10-year average: 2.6; a paper · 2.2 since 2024 -0.5
Typical range: 2–3; questions a paper; fewest 2, most 3
Weighted estimate: 2.5; model, recent papers count more · about 10 marks

Typical range (fact)
10-year average (fact)
Weighted estimate (model)

Typical range: questions per paper in the middle eight of the ten papers, leaving out the single highest and lowest year (about the 10th to 90th percentile), each paper scaled to 180 questions. The ten-year average and the range are historical fact. The weighted estimate is a model: each paper's share, with recent papers counting more (half-life three years), and dropped syllabus removed. It is a guide to effort, not a forecast.

What to do

How to spend time on Semiconductor Electronics: Materials, Devices and Simple Circuits

Priority

Must do

Among the chapters that held the first half of all NEET questions in ten years. How bands are set

Past questions: 27in 10 of 10 papers
Study plan gives it: 17 hover 12 months; 13 h over 6

Study this chapter →Practise →

Ideas asked most often

Combined Circuit Truth Tables5×
p-n Junction: Depletion Region and Biasing4×
Rectifiers and Filters3×
Bipolar Junction Transistor3×
Zener Diode as Voltage Regulator2×

73 of the 85 ideas in Lumi’s map of this chapter have not been asked or touched in ten years. New questions often come from ideas like these, so learn the whole chapter, not just the list above.

Questions per year

Kind of question

SHARE OF 10 YEARS

Figure-based59%
Recall22%
Concept7%
Calculation4%
Application4%
Two statements4%

Most common asks: truth table of combined gate circuit (5); numerical (2); output waveform of combined gate circuit (1).

Profile

This chapter in numbers

Where it ranks, how steady it is, and what it costs to study.

Rank, all NEET chapters: #28; of 80 by weighted estimate
Rank in Physics: #3; of 27 chapters
Share of the paper: 1.4%; ten-year average
Busiest year: 2017; 3 questions
Year to year: Steady; varies by about 0.4 questions
Long-run direction: -0.08; questions per paper, per year
Easy questions: 52%; 48% of ideas rated hard
With a figure: 63%; graph, diagram or structure
Study time: 17 h; 13 h on a 6-month plan
Marks per study hour: 0.58; #34 of 80 chapters
Foundation for others: 63%; of its ideas are used in other chapters

Difficulty, year by year

Each question rated easy, medium or hard against NCERT.

20173
20183
20192
20203
20213
20223
20233
20243
20252
20262

Easy
Medium
Hard

What it asks you to do

SHARE OF QUESTIONS

Application30%
Recall26%
Concept19%
Figure reading11%
Calculation7%
Data or graph4%
Multi-step4%

Coverage

How much of the chapter NEET has used

We split the chapter into 85 ideas. In ten years NEET built a question around 6 of them. Most of the chapter has never been asked, which is why learning it whole beats memorising past questions.

Asked as the main idea: 6
Touched on in a question: 6
Never asked: 73

Topics

What repeats, topic by topic

Questions per topic in each year's paper. Topics that come every year are worth learning first.

Semiconductor Devices · Every year17
2212222112
Logic Gates · Every year10
111111121

’17’18’19’20’21’22’23’24’25’26

Topic	2017	’18	2019	’20	2021	’22	2023	’24	2025	’26	Total
Semiconductor DevicesEvery year	2	2	1	2	2	2	2	1	1	2	17
Logic GatesEvery year	1	1	1	1	1	1	1	2	1	·	10

02+questions in that year’s paper

Semiconductor Devices
Expect a diagram-based item (read or label a figure/graph, then answer) about Semiconductor Devices; a one-line factual recall item is the next most likely shape. Past framings centre on: numerical; effect of temperature on p-n junction.

Drill down

Topic, idea, question

Open a topic to see every idea NEET tested inside it, then open an idea to read the questions. Each row shows its ten papers.

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

Open17 · 63%63%10/102222222
7 ideas inside
- Repeated4 · 24%24%4/10
- 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
Open10 · 37%37%9/102

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

Ideas

The exact ideas NEET has asked

Inside the topics, 13 different ideas were tested. These came more than once, or are new since 2024.

Combined Circuit Truth Tables5×
truth table of combined gate circuit
p-n Junction: Depletion Region and Biasing4×
effect of bias on depletion region
Rectifiers and Filters3×
identify component in rectifier circuit
Bipolar Junction Transistor3×
numerical
Zener Diode as Voltage Regulator2×
statement i/ii on diodes
Photodiodes, LEDs and Solar Cells2×
statement i/ii on special purpose diodes
Intrinsic and Extrinsic Semiconductors2×
compare currents in n-type and p-type
Boolean Algebra ExpressionsNew1×
boolean expression from truth table
NAND to NOT ConversionNew1×
truth table of combined gate circuit

Idea	Times	Usually asked as
Combined Circuit Truth Tablestruth table of combined gate circuit	5	Figure-based
p-n Junction: Depletion Region and Biasingeffect of bias on depletion region	4	Figure-based
Rectifiers and Filtersidentify component in rectifier circuit	3	One-line MCQ
Bipolar Junction Transistornumerical	3	Figure-based
Zener Diode as Voltage Regulatorstatement i/ii on diodes	2	Figure-based
Photodiodes, LEDs and Solar Cellsstatement i/ii on special purpose diodes	2	Figure-based
Intrinsic and Extrinsic Semiconductorscompare currents in n-type and p-type	2	One-line MCQ
Boolean Algebra Expressionsboolean expression from truth table	1	One-line MCQNew
NAND to NOT Conversiontruth table of combined gate circuit	1	Figure-basedNew

Every question

Semiconductor Electronics: Materials, Devices and Simple Circuits questions, year by year

The opening words of each question as it appeared in the official paper.

NEET 20262 questions

Q16An 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…Figure-based · figure
Q42Three 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…Figure-based · figure

NEET 20252 questions

Q8The output (Y) of the given logic implementation is similar to the output of an/a _______ gate.Figure-based · figure
Q40A full wave rectifier circuit with diodes ( $D_1$ ) and ( $D_2$ ) is shown in the figure. If input supply voltage $V_{in} = 220\sin(100\pi t)$ …Figure-based · figure

NEET 20243 questions

Q4Consider the following statements A and B and identify the correct answer : [graph: I vs V axes with quadrants (I)-(IV)] A. For a…Figure-based · figure
Q15The output ( $Y$ ) of the given logic gate is similar to the output of an/a :Figure-based · figure
Q33A logic circuit provides the output $Y$ as per the following truth table A | B | Y 0 | 0 | 1 0 | 1 | 0 1 | 0 | 1 1 | 1 | 0 The expression…One-line MCQ · figure

NEET 20233 questions

Q5A full wave rectifier circuit consists of two p-n junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of…One-line MCQ
Q16Given below are two statements: Statement I : Photovoltaic devices can convert optical radiation into electricity. Statement II : Zener…Two statements
Q39For the following logic circuit, the truth table is:Figure-based · figure

NEET 20223 questions

Q1In half wave rectification, if the input frequency is 60 Hz, then the output frequency would be :One-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 :Figure-based · figure
Q45[Figure: logic circuit with inputs A, B and output C] The truth table for the given logic circuit is :Figure-based · figure

NEET 20213 questions

Q21The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field…One-line MCQ
Q32Consider the following statements (A) and (B) and identify the correct answer. (A) A zener diode is connected in reverse bias, when used…Other
Q46For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal $y$ ?Figure-based · figure

NEET 20203 questions

Q153The increase in the width of the depletion region in a p-n junction diode is due to :One-line MCQ
Q156For transistor action, which of the following statements is correct ?One-line MCQ
Q180For the logic circuit shown, the truth table is :Figure-based · figure

NEET 20192 questions

Q18For a p-type semiconductor, which of the following statements is true ?One-line MCQ
Q39[Circuit diagram: switches A and B with LED (Y)] The correct Boolean operation represented by the circuit diagram drawn is :Figure-based · figure

NEET 20183 questions

Q15In 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 $\beta$ …Figure-based · figure
Q16In a p-n junction diode, change in temperature due to heatingOne-line MCQ
Q17In the combination of the following gates the output Y can be written in terms of inputs A and B asFigure-based · figure

NEET 20173 questions

Q21In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 k $\Omega$ .…Numerical
Q22Which one of the following represents forward bias diode ?Figure-based · figure
Q24The given electrical network is equivalent to :Figure-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.

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