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Alternating Current

JEE Mains Physics. Try each one first, then open its answer.

Top 10 JEE Mains PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 10 times: 2021 Paper 17, 2021 Paper 18, 28 Jun 2022, 29 Jun 2022, 25 Jan 2023, 29 Jan 2023, 6 Apr 2024, 23 Jan 2025, 23 Jan 2026 S1, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 10 of this type

    23
    A series LCR circuit with R =20Ω, L=1.6H= 20\Omega,\text{ }L = 1.6H and C=40μ FC = 40\mu\text{ }F is connected to a variable frequency a.c. source. The inductive reactance at resonant frequency is ____\_\_\_\_ Ω\Omega.

  2. Question 2

    This type asked 7 times: 2021 Paper 10, 25 Jun 2022, 25 Jan 2023, 27 Jan 2024, 24 Jan 2026 S1, 4 Apr 2026 S1, 6 Apr 2026 S1. This one: 6 Apr 2026 S1 See all 7 of this type

    20
    A LCR series circuit driven with Erms=90 VE_{rms}= 90\text{ }V at frequency fd=30 Hzf_{d}= 30\text{ }Hz has resistance R=80ΩR = 80\Omega, an inductance with inductive reactance XL=20.0ΩX_{L}= 20.0\Omega and capacitance with capacitive reactance XC=80.0ΩX_{C}= 80.0\Omega. The power factor of the circuit is ____\_\_\_\_ .

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  3. Question 3

    This type asked 5 times: 25 Jun 2022, 27 Jul 2022, 29 Jul 2022, 31 Jan 2023, 4 Apr 2025. This one: 4 Apr 2025 See all 5 of this type

    100
    An inductor of self inductance 1 H connected in series with a resistor of 100πohm100\pi ohm and an ac supply of 100π100\pi volt, 50 Hz . Maximum current flowing in the circuit is ____\_\_\_\_ A.

  4. Question 4

    This type asked 5 times: 2021 Paper 26, 26 Jun 2022, 31 Jan 2023, 8 Apr 2024, 22 Jan 2025. This one: 22 Jan 2025 See all 5 of this type

    79
    A series LCR circuit is connected to an alternating source of emf EE. The current amplitude at resonant frequency is I0I_{0}. If the value of resistance RR becomes twice of its initial value then amplitude of current at resonance will be

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  5. Question 5

    This type asked 5 times: 29 Jun 2022, 29 Jan 2023, 10 Apr 2023, 12 Apr 2023, 6 Apr 2024. This one: 6 Apr 2024 See all 5 of this type

    12
    Given below are two statements: Statement I: In an LCR series circuit, current is maximum at resonance. Statement II: Current in a purely resistive circuit can never be less than that in a series LCR circuit when connected to same voltage source. In the light of the above statements, choose the correct from the options given below:

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  6. Question 6

    This type asked 5 times: 2021 Paper 9, 2021 Paper 15, 14 Jun 2022, 27 Jun 2022, 30 Jan 2024. This one: 30 Jan 2024 See all 5 of this type

    98
    An alternating voltage V(t)=220sin⁡100πtV(t) = 220\sin100\pi t volt is applied to a purely resistive load of 50Ω50\Omega. The time taken for the current to rise from half of the peak value to the peak value is:

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  7. Question 7

    This type asked 5 times: 2021 Paper 9, 2021 Paper 25, 28 Jul 2022, 24 Jan 2023, 8 Apr 2023. This one: 8 Apr 2023 See all 5 of this type

    111
    A series combination of resistor of resistance 100 Ω\Omega, inductor of inductance 1H1H and capacitor of capacitance 6.25μF6.25\mu F is connected to an ac source. The quality factor of the circuit will be___

  8. Question 8

    This type asked 5 times: 2021 Paper 8, 14 Jun 2022, 28 Jul 2022, 29 Jul 2022, 31 Jan 2023. This one: 31 Jan 2023 See all 5 of this type

    107
    An alternating voltage source V=260sin⁡(628t)V = 260\sin(628t) is connected across a pure inductor of 5mH5mH. Inductive reactance in the circuit is:

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  9. Question 9

    This type asked 4 times: 25 Jul 2022, 6 Apr 2023, 5 Apr 2024, 8 Apr 2024. This one: 8 Apr 2024 See all 4 of this type

    115
    An alternating emf E=1102E = 110\sqrt{2} sin 100t100t volt is applied to a capacitor of 2μF2\mu F, the rms value of current in the circuit is ____\_\_\_\_ mAmA.

  10. Question 10

    This type asked 4 times: 28 Jul 2022, 6 Apr 2023, 27 Jan 2024, 30 Jan 2024. This one: 30 Jan 2024 See all 4 of this type

    11
    Primary coil of a transformer is connected to 220 V220\text{ }V ac. Primary and secondary turns of the transforms are 100 and 10 respectively. Secondary coil of transformer is connected to two series resistance shown in shown in figure. The output voltage (V0)\left( V_{0} \right) is:

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