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Saturday, 10 October

JEE Main Physics · Class 12

Alternating Current: JEE Main previous year questions

Alternating Current had 37 questions in the 42 JEE Main shifts Lumi analysed, about 0.7 a shift, asked in 28 of 42 shifts. It ranks 18 of 29 Physics chapters by questions; 5% of its questions were hard.

Questions
37
in 28 of 42 shifts
A shift, on average
0.7
of 25 Physics questions
Since 2024
+0.1
0.7 a shift in 2017–23, 0.8 in 2024–26
Numerical answer
14
38% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
05100’172’203’217’224’239’245’257’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 2017
  • 20202
  • 20213
  • 20227
  • 20234
  • 20249
  • 20255
  • 20267
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

5 topics and 19 distinct ideas; 6 ideas were asked more than once. Most questions are single correct and calculation.

Topics, by questions

5 questions had no close topic in our taxonomy and are counted for the chapter only.

Ideas asked most
6 repeat

Study it on Lumi

Alternating Current: the interactive lesson

Every question

All 37 Alternating Current questions

Newest first. Each opens with its options and the official answer.

2026 7 questions

  1. 2 Apr 2026, Shift 2 · Q42The figure given below shows an LCR series circuit with two switches S1S_1 and S2S_2. When switch S1S_1 is closed keeping S2S_2 open, the…HardSingle correctHas a figure
  2. 4 Apr 2026, Shift 1 · Q42Consider a circuit consisting of a capacitor (20 μ20\ \muF), resistor (100 Ω100\ \Omega) and two identical diodes as shown in figure. The…MediumDiagram basedHas a figure
  3. 4 Apr 2026, Shift 1 · Q50An inductor of 1010 mH, capacitor of 0.1 μ0.1\ \muF and a resistor of 100 Ω100\ \Omega are connected in series across an a.ca.c power supply…MediumNumerical value
  4. 5 Apr 2026, Shift 1 · Q44An a.c. source of angular frequency ω\omega is connected across a resistor RR and a capacitor CC in series. The current is observed as…MediumSingle correct
  5. 5 Apr 2026, Shift 2 · Q48A series LCR circuit with R=20 ΩR=20\ \Omega, L=1.6L=1.6 H and C=40 μFC=40\ \mu\mathrm{F} is connected to a variable frequency a.c. source. The…EasyNumerical value
  6. 6 Apr 2026, Shift 1 · Q43An inductor of inductance 10 mH having resistance of 100 Ω\Omega is connected to battery of E.M.F. 1.0 V through a switch as shown in the…MediumSingle correctHas a figure
  7. 6 Apr 2026, Shift 1 · Q45A LCR series circuit driven with Erms=90E_{rms}=90 V at frequency fd=30f_d=30 Hz has resistance R=80 ΩR=80\ \Omega, an inductance with inductive…EasySingle correct

2025 5 questions

  1. 3 Apr 2025, Shift 2 · Q37An electric bulb rated as 100W-220V is connected to an ac source of rms voltage 220V. The peak value of current through the bulb is :EasySingle correct
  2. 4 Apr 2025, Shift 2 · Q48An inductor of self inductance 1 H is connected in series with a resistor of 100 π100\,\pi ohm and an ac supply of 100 π100\,\pi volt, 50 Hz.…MediumNumerical value
  3. 7 Apr 2025, Shift 1 · Q35An ac current is represented as i=52+10cos⁡(650πt+π6)i = 5\sqrt{2} + 10\cos\left(650\pi t + \frac{\pi}{6}\right) Amp The r.m.s value of the current isEasySingle correct
  4. 7 Apr 2025, Shift 1 · Q49For ac circuit shown in figure, R = 100 kΩ\Omega and C = 100 pF and the phase difference between Vin\mathrm{V_{in}} and…HardNumerical valueHas a figure
  5. 7 Apr 2025, Shift 2 · Q48An inductor of reactance 100 Ω100\ \Omega, a capacitor of reactance 50 Ω50\ \Omega, and a resistor of resistance 50 Ω50\ \Omega are connected in…EasyNumerical value

2024 9 questions

  1. 6 Apr 2024, Shift 2 · Q59For a given series LCR circuit it is found that maximum current is drawn when value of variable capacitance is 2.5 nF. If resistance of…EasyNumerical value
  2. 8 Apr 2024, Shift 1 · Q50A LCR circuit is at resonance for a capacitor C, inductance L and resistance R. Now the value of resistance is halved keeping all other…EasySingle correct
  3. 9 Apr 2024, Shift 1 · Q43A bulb and a capacitor are connected in series across an ac supply. A dielectric is then placed between the plates of the capacitor. The…MediumSingle correct
  4. 9 Apr 2024, Shift 1 · Q58When a coil is connected across a 2020 V dc supply, it draws a current of 55 A. When it is connected across 2020 V, 5050 Hz ac supply, it…MediumNumerical value
  5. 9 Apr 2024, Shift 2 · Q53A capacitor of reactance 43 Ω4\sqrt{3}\ \Omega and a resistor of resistance 4 Ω4\ \Omega are connected in series with an ac source of peak…MediumNumerical value
  6. 29 Jan 2024, Shift 1 · Q43A capacitor of capacitance 100 μ100\ \muF is charged to a potential of 12 V and connected to a 6.4 mH inductor to produce oscillations. The…EasySingle correct
  7. 30 Jan 2024, Shift 2 · Q43An alternating voltage V(t)=220sin⁡100πtV(t) = 220\sin 100\pi t volt is applied to a purely resistive load of 50 Ω50\ \Omega. The time taken for the…MediumSingle correct
  8. 30 Jan 2024, Shift 2 · Q58A power transmission line feeds input power at 2.3kV2.3kV to a step down transformer with its primary winding having 3000 turns. The output…EasyNumerical value
  9. 31 Jan 2024, Shift 2 · Q43An AC voltage V=20sin⁡200πtV=20\sin 200\pi t is applied to a series LCR circuit which drives a current I=10sin⁡(200πt+π3)I=10\sin\left(200\pi t+\frac{\pi}{3}\right).…EasySingle correct

2023 4 questions

  1. 6 Apr 2023, Shift 1 · Q54An ideal transformer with purely resistive load operates at 12 kV on the primary side. It supplies electrical energy to a number of nearby…MediumNumerical value
  2. 8 Apr 2023, Shift 2 · Q58A series combination of resistor of resistance 100 Ω\Omega, inductor of inductance 1 H and capacitor of capacitance 6.25 μ\muF is…EasyNumerical value
  3. 11 Apr 2023, Shift 1 · Q36As per the given graph, choose the correct representation for curve A and curve B. {Where XCX_C = reactance of pure capacitive circuit…EasyDiagram basedHas a figure
  4. 13 Apr 2023, Shift 2 · Q44Given below are two statements: Statement I : An AC circuit undergoes electrical resonance if it contains either a capacitor or an…MediumTwo statements

2022 7 questions

  1. 25 Jul 2022, Shift 1 · Q42To increase the resonant frequency in series LCR circuit,EasySingle correct
  2. 25 Jul 2022, Shift 1 · Q44The rms value of conduction current in a parallel plate capacitor is 6.9 μ6.9\ \muA. The capacity of this capacitor, if it is connected to…MediumSingle correct
  3. 28 Jul 2022, Shift 1 · Q44The equation of current in a purely inductive circuit is 5sin⁡(49πt−30∘)5\sin(49\pi t-30^\circ). If the inductance is 30 mH then the equation for the…MediumSingle correct
  4. 28 Jul 2022, Shift 1 · Q54The frequencies at which the current amplitude in an LCR series circuit becomes 12\frac{1}{\sqrt{2}} times its maximum value, are 212 rad…MediumNumerical value
  5. 24 Jun 2022, Shift 1 · Q41A resistance of 40 Ω40\ \Omega is connected to a source of alternating current rated 220 V, 50 Hz. Find the time taken by the current to…EasySingle correct
  6. 24 Jun 2022, Shift 1 · Q54As shown in the figure an inductor of inductance 200 mH is connected to an AC source of emf 220 V and frequency 50 Hz. The instantaneous…MediumNumerical valueHas a figure
  7. 29 Jun 2022, Shift 1 · Q40For a series LCR circuit, I vs ω\omega curve is shown : (a) To the left of ωr\omega_r, the circuit is mainly capacitive. (b) To the left…EasyOtherHas a figure

2021 3 questions

  1. 16 Mar 2021, Shift 2 · Q11For the given circuit, comment on the type of transformer used.EasyDiagram basedHas a figure
  2. 18 Mar 2021, Shift 1 · Q6An AC source rated 220 V, 50 Hz is connected to a resistor. The time taken by the current to change from its maximum to the rms value is :EasySingle correct
  3. 18 Mar 2021, Shift 1 · Q15In a series LCR resonance circuit, if we change the resistance only, from a lower to higher value :MediumSingle correct

2020 2 questions

  1. 9 Jan 2020, Shift 2 · Q15In LC circuit the inductance L=40L = 40 mH and capacitance C=100 μC = 100\ \muF. If a voltage V(t)=10sin⁡(314 t)V(t) = 10\sin(314\,t) is applied to the circuit,…MediumSingle correct
  2. 6 Sep 2020, Shift 2 · Q23In a series LR circuit, power of 400 W is dissipated from a source of 250 V, 50 Hz. The power factor of the circuit is 0.8. In order to…MediumNumerical value

Pattern: Asked most years.