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Physics - Alternating Current

Practise 68 COMEDK previous year questions on Alternating Current, compiled from papers spanning 2012 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty COMEDK tests.

Alternating Current has been asked in 14 of the 15 years of COMEDK papers analysed (2012–2026), with 68 questions in all. 46% of them were easy, 44% moderate and 10% tough. Most of its questions came from 2025, with 12 questions that year. In the last three years (2024–2026) it had 30 questions across 10 papers, about 3 per paper.

The chapter's 5 topics are not weighted equally: Alternating Current, Voltage and Power (28 questions, 41%), AC Circuits (21 questions, 31%), and Transformers (13 questions, 19%) have been asked the most. Alternating Current, Voltage and Power has also led over the last five years, with 21 questions. AC Circuits has produced the most tough questions (3).

  1. 1If wattless current flows in an AC circuit, then the circuit is:09 May, 2026 (S1)Alternating Current, Voltage and Power
  2. 2A solenoid having resistance and inductance is connected to an AC source . Find the maximum current.09 May, 2026 (S1)AC Circuits
  3. 3An electronic device operates at 2 MHz. The oscillating circuit has an inductance H. What is the capacitive reactance of the resonant circui09 May, 2026 (S2)AC Circuits
  4. 4When a current of 2.5 A passes through the primary coil of a transformer of 200 number turns, the magnetic flux linked with the secondary co09 May, 2026 (S2)Transformers
  5. 5In a given circuit, the instantaneous values of the alternating voltage and current are volt and ampere respectively. Find the average power09 May, 2026 (S2)Alternating Current, Voltage and Power
  6. 6A source of alternating is connected to a capacitor. Then the instantaneous current in the circuit is:09 May, 2026 (S2)Alternating Current, Voltage and Power
  7. 7In a series LCR circuit, the inductive reactance is and the capacitive reactance is . The resistance R in the circuit is . What is the power25 May, 2025 (Shift)Quality and Power Factor
  8. 8A series LCR circuit is connected to an AC source of 120 V and 60 Hz . The value of resistance R in the circuit is .A voltmeter reads the vo25 May, 2025 (Shift)AC Circuits
  9. 9An ideal inductor is connected across a capacitor. Oscillations of energy K are set up in the circuit. The capacitor plates are slowly drawn10 May, 2025 (S1)AC Circuits
  10. 10An LCR series ac circuit is at resonance with 10 V each across and R. If the resistance is halved, the respective voltage across and L are10 May, 2025 (S1)AC Circuits
  11. 11A bulb of resistance 280 Ohm is supplied with a voltage . The peak current is10 May, 2025 (S1)Alternating Current, Voltage and Power
  12. 12What should be the value of the inductance of the coil which is to be connected to 220 V , 50 Hz supply so that maximum current of flows thr10 May, 2025 (S2)Alternating Current, Voltage and Power
  13. 13The ratio of the number of turns of the primary coil to the secondary coil of an ideal transformer is . The primary is connected to 220 V su10 May, 2025 (S2)Transformers
  14. 14In which of the following circuit do we find the current and voltage in phase?10 May, 2025 (S2)Alternating Current, Voltage and Power
  15. 15A series LCR circuit having and is connected to a variable frequency of 220 V . What is the average power transferred to the circuit in one 10 May, 2025 (S3)AC Circuits
  16. 16A power transmission line feeds input power at 2200 V to a step-down transformer with its primary windings having 2000 turns. The output pow10 May, 2025 (S3)Transformers
  17. 17The instantaneous values of alternating current and voltages in a circuit are ampere and volt. What is the average power consumed in the cir10 May, 2025 (S3)Alternating Current, Voltage and Power
  18. 18In a pure inductive circuit, a sinusoidal voltage is applied to a pure inductance of . The current through the coil is:10 May, 2025 (S3)Alternating Current, Voltage and Power
  19. 19A group of devices having a total power rating of 500 watt is supplied by an AC voltage . Assuming the current in the circuit is of the form2024 (Afternoon Shift)Alternating Current, Voltage and Power
  20. 20A transformer has 400 turns in its primary winding and 800 turns in its secondary winding. The primary voltage is and the load in the second2024 (Afternoon Shift)Transformers
  21. 21An AC voltage source of variable angular frequency and fixed amplitude is connected in series with a capacitance and an electric bulb of res2024 (Afternoon Shift)Alternating Current, Voltage and Power
  22. 22When an A.C. source is connected to a inductive circuit,2024 (Evening Shift)Alternating Current, Voltage and Power
  23. 23A transformer of efficiency has 200 turns in the primary and 40000 turns in the secondary. It is connected to a main supply and secondary fe2024 (Evening Shift)Transformers
  24. 24In the A. C. circuit given below, an inductor, capacitor, and resistor ( ) are in series with a source. Voltmeters (across the inductor) and2024 (Evening Shift)AC Circuits
  25. 25When an alternating voltage source is applied to a pure capacitor of , then the instantaneous value of current through capacitor is2024 (Memory Based)AC Circuits
  26. 26A step down transformer is used to reduce the main supply of 220 V to 10 V . If the primary draws 5 A and secondary 88 A current, calculate 2024 (Memory Based)Transformers
  27. 27Output of an source is . Which of these are correct?2024 (Memory Based)Alternating Current, Voltage and Power
  28. 28A coil of inductance and resistance is connected to an alternating current source of frequency . What will be the phase difference between t2024 (Morning Shift)LR Circuits
  29. 29A coil offers a resistance of for a direct current. If we send an alternating current through the same coil, the resistance offered by the c2024 (Morning Shift)Alternating Current, Voltage and Power
  30. 30A transformer which steps down to is to operate a device having impedance . The current drawn by the primary coil of the transformer is :2024 (Morning Shift)Transformers
  31. 31ac is more dangerous than dc Why?2023 (Evening Shift)Alternating Current, Voltage and Power
  32. 32The current drawn by the primary coil of an ideal transformer, which steps up into , to operate a device having a load resistance is:2023 (Evening Shift)Transformers
  33. 33What should be the inductance of an inductor connected to source so that the maximum current of A flows through it?2023 (Evening Shift)Alternating Current, Voltage and Power
  34. 34The instantaneous values of alternating current and voltages in a circuit given as The average power (in watts) consumed in the circuit is2023 (Memory Based)Alternating Current, Voltage and Power
  35. 35In the series circuit shown, the impedance is2023 (Memory Based)AC Circuits
  36. 36In the case of an inductor2023 (Memory Based)Alternating Current, Voltage and Power
  37. 37In an electrical circuit and voltage source are all connected in series. When is removed from the circuit, the phase difference between the 2023 (Memory Based)Quality and Power Factor
  38. 38In the case of an inductor2023 (Morning Shift)Alternating Current, Voltage and Power
  39. 39In the series L-C-R circuit shown, the impedance is2023 (Morning Shift)AC Circuits
  40. 40The instantaneous values of alternating current and voltages in a circuit given as The average power (in watts) consumed in the circuit is2023 (Morning Shift)Alternating Current, Voltage and Power
  41. 41In an electrical circuit and voltage source are all connected in series. When is removed from the circuit, the phase difference between the 2023 (Morning Shift)AC Circuits
  42. 42A DC ammeter and a hot wire ammeter are connected to a circuit in series. When a direct current is passed through circuit, the DC ammeter sh2022Alternating Current, Voltage and Power
  43. 43A series circuit is connected to an source of and shown in figure. If the readings of the three voltmeters and are and respectively, the val2022AC Circuits
  44. 44An alternating voltage is applied to a series combination of and an inductor of . The power factor of the circuit is,2022Quality and Power Factor
  45. 45The AC voltage across a resistance can be measured using a2022Alternating Current, Voltage and Power
  46. 46For the same resonant frequency, if is changed from to , then capacitance should change from to2021AC Circuits
  47. 47What should be the value of self-inductance of an inductor that should be connected to supply, so that a maximum current of A flows through 2021Alternating Current, Voltage and Power
  48. 48If reactance is times the resistance, then find the phase difference.2021Alternating Current, Voltage and Power
  49. 49In stcp-up transformer, relation between number of turns in primary and number of turns in secondary coils is2020Transformers
  50. 50For a series circuit at resonance, which statement is not true?2020AC Circuits

Frequently Asked Questions

1.How many questions are available for Alternating Current?

This chapter includes 68 questions compiled from COMEDK papers spanning 2012 to 2026.

2.Are these questions only from COMEDK, or from other exams too?

These are COMEDK questions specifically for the Alternating Current chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Alternating Current an important chapter for COMEDK Physics?

Alternating Current has appeared in 14 of the 15 years of COMEDK papers covered here, with 68 questions across 23 papers - about 3 per paper it appears in.

4.What is the difficulty level of Alternating Current questions in COMEDK?

Of the 68 questions analysed for this chapter, 46% are easy, 44% moderate and 10% tough. 2025 had the most, with 12 questions.

5.Which topics in Alternating Current should I focus on?

These topics have carried the most weightage in Alternating Current:

  • Alternating Current, Voltage and Power - 28 questions (41%)
  • AC Circuits - 21 questions (31%)
  • Transformers - 13 questions (19%)
  • AC Circuits has produced the most tough questions (3).
6.Is Alternating Current's weightage in COMEDK going up or down?

Across all 23 papers analysed, Alternating Current has averaged about 3.0 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 3.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.