NEET UG · Physics · Alternating Current

LCR Circuits: NEET previous year questions

15 questions in ten years of NEET, in 8 of 10 papers. Pattern: Every year. Here is how it is asked and which ideas come back.

Asked in 10 years: 15; about 1.4 per paper
Years asked: 8/10; last asked 2026
Chance of a question next paper: 84%; historical rate, how we compute it
Weighted estimate: 1.5; model; history: 1.4 a paper on average, typically 0–3

Key findings

01
Asked in 8 of 10 papers, 15 questions in all: #35 of 204 topics by ten-year total. It comes back every 1.1 years on average.
02
67% of its questions since 2018 tested an idea never asked before; 2 repeated an idea from the year before.
03
The most repeated idea is Ideal Transformer, asked 3 times (2021, 2023, 2024), usually as “numerical”.
04
NEET has asked 9 of the 93 ideas in this topic; 79 have never been asked, directly or indirectly.
05
Mostly asked as numerical (87%); 53% easy, 7% hard.

Questions per year

Up to 2023: 1.5; per paper
Since 2024: 1.3; -0.2
Usual gap: 1.1 yrs; between papers asking it
Swing: ±0.9; questions, year to year

Recent framings

numerical: current amplitude in series LCR circuit
numerical: current and phase angle in series LCR
numerical: voltage ratio of ideal transformer

Revise first

Series LCR Impedance Calculation (2023 2026); Ideal Transformer (2021 2023 2024); Capacitive Reactance Calculation (2020 2024)

How it is asked

Difficulty, format and skill

Across all 15 questions on LCR Circuits since 2017.

Difficulty

QUESTIONS

Easy8 · 53%
Medium6 · 40%
Hard1 · 7%

Format

Numerical · 13 Q87%
Figure-based · 1 Q7%
One-line MCQ · 1 Q7%

Skill tested

Calculation · 10 Q67%
Multi-step · 3 Q20%
Application · 1 Q7%
Recall · 1 Q7%

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 9 of the 93 ideas in this topic. 79 have never been asked yet.

979

Asked directly9 · 10%
Touched inside another question5 · 5%
Never asked79 · 85%

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

Repeated3 · 20%20%3/10
- 2024 · Q22
  In an ideal transformer, the turns ratio is $\frac{N_p}{N_s} = \frac{1}{2}$ . The ratio $V_s : V_p$ is equal to (the symbols carry their…
  easyNumericalAsked the year before
- 2023 · Q4
  A 12 V, 60 W lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of 220 V. Assuming the…
  easyNumerical
- 2021 · Q39
  A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the…
  easyNumericalNew idea
Repeated2 · 13%13%2/10
Repeated2 · 13%13%2/10
Repeated2 · 13%13%2/10
1 · 7%7%1/10
1 · 7%7%1/10
1 · 7%7%1/10
1 · 7%7%1/10
1 · 7%7%1/10
1 · 7%7%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

10 different ideas were tested; 4 came more than once. Series LCR Impedance Calculation is the foundation for 58 other ideas in the syllabus.

Ideal Transformer3×
numerical
Numerical · 6% next
Series LCR Impedance Calculation2×
numerical
Figure-based · 6% next · foundation for 58
Capacitive Reactance Calculation2×
numerical
Numerical · 6% next · foundation for 13
Resonant Frequency Condition2×
numerical
Numerical · 6% next · foundation for 31
LCR Phase Angle Calculation1×
numerical
Numerical · 6% next · foundation for 2
RMS and Peak Value Conversions1×
relation of peak and rms value
One-line MCQ · 4% next · foundation for 8
Half-Power Frequencies1×
numerical
Numerical · 4% next · foundation for 1
Impedance Triangle Applications1×
numerical
Numerical · 4% next · foundation for 2
Unity Power Factor at Resonance1×
numerical
Numerical · 4% next
Average Power Consumption1×
numerical
Numerical · 4% next · foundation for 6

Idea	Times	Format	Chance next	Foundation for
Ideal Transformernumerical	3	NumericalCalculation	6%	–
Series LCR Impedance Calculationnumerical	2	Figure-basedCalculation	6%	58 ideas
Capacitive Reactance Calculationnumerical	2	NumericalCalculation	6%	13 ideas
Resonant Frequency Conditionnumerical	2	NumericalCalculation	6%	31 ideas
LCR Phase Angle Calculationnumerical	1	NumericalCalculation	6%	2 ideas
RMS and Peak Value Conversionsrelation of peak and rms value	1	One-line MCQRecall	4%	8 ideas
Half-Power Frequenciesnumerical	1	NumericalCalculation	4%	1 ideas
Impedance Triangle Applicationsnumerical	1	NumericalMulti-step	4%	2 ideas
Unity Power Factor at Resonancenumerical	1	NumericalMulti-step	4%	–
Average Power Consumptionnumerical	1	NumericalCalculation	4%	6 ideas

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

LCR Circuits questions, year by year

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

NEET 20261 question

Q30
An ac voltage $V=220\sin(2\times10^3t)$ Volt is applied to a series LCR circuit. Then the current amplitude in this circuit is : (Given :…
Idea: Series LCR Impedance Calculation
EasyNumerical

NEET 20251 question

Q16
To an ac power supply of 220 V at 50 Hz, a resistor of 20 Ω, a capacitor of reactance 25 Ω and an inductor of reactance 45 Ω are connected…
Idea: LCR Phase Angle Calculation
New ideaMediumNumerical

NEET 20242 questions

Q22
In an ideal transformer, the turns ratio is $\frac{N_p}{N_s} = \frac{1}{2}$ . The ratio $V_s : V_p$ is equal to (the symbols carry their…
Idea: Ideal Transformer
Asked last yearEasyNumerical
Q50
A 10 $\mu$ F capacitor is connected to a 210 V, 50 Hz source as shown in figure. The peak current in the circuit is nearly ( $\pi = 3.14$ ):
Idea: Capacitive Reactance Calculation
MediumNumerical · figure

NEET 20233 questions

Q4
A 12 V, 60 W lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of 220 V. Assuming the…
Idea: Ideal Transformer
EasyNumerical
Q20
In a series $LCR$ circuit, the inductance $L$ is 10 mH, capacitance $C$ is 1 $\mu$ F and resistance $R$ is 100 $\Omega$ . The frequency at…
Idea: Resonant Frequency Condition
Asked last yearEasyNumerical
Q38
The net impedance of circuit (as shown in figure) will be :
Idea: Series LCR Impedance Calculation
New ideaMediumFigure-based · figure

NEET 20222 questions

Q19
The peak voltage of the ac source is equal to :
Idea: RMS and Peak Value Conversions
New ideaEasyOne-line MCQ
Q37
A series LCR circuit with inductance 10 H, capacitance 10 μF, resistance 50 Ω is connected to an ac source of voltage, V = 200 sin(100 t)…
Idea: Resonant Frequency Condition
New ideaMediumNumerical

NEET 20213 questions

Q34
An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance 'R' are connected in series to an ac source of…
Idea: Impedance Triangle Applications
New ideaEasyNumerical · figure
Q37
A series LCR circuit containing 5.0 H inductor, 80 $\mu$ F capacitor and 40 Ω resistor is connected to 230 V variable frequency ac source.…
Idea: Half-Power Frequencies
New ideaHardNumerical
Q39
A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the…
Idea: Ideal Transformer
New ideaEasyNumerical

NEET 20202 questions

Q154
A 40 $\mu$ F capacitor is connected to a 200 V, 50 Hz ac supply. The rms value of the current in the circuit is, nearly :
Idea: Capacitive Reactance Calculation
New ideaEasyNumerical
Q169
A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and…
Idea: Unity Power Factor at Resonance
New ideaMediumNumerical

NEET 20181 question

Q28
An inductor 20 mH, a capacitor 100 $\mu$ F and a resistor 50 $\Omega$ are connected in series across a source of emf, V = 10 sin 314 t. The…
Idea: Average Power Consumption
New ideaMediumNumerical

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