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Physics - Alternating Current

Practise 59 KCET previous year questions on Alternating Current, compiled from papers spanning 2007 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 KCET tests.

Alternating Current has been asked in 20 of the 20 years of KCET papers analysed (2007–2026), with 59 questions in all. 54% of them were easy, 34% moderate and 12% tough. Most of its questions came from 2018, with 5 questions that year. In the last three years (2024–2026) it had 9 questions across 3 papers, about 3 per paper.

The chapter's 5 topics are not weighted equally: AC Circuits (26 questions, 44%), Alternating Current, Voltage and Power (19 questions, 32%), and Transformers (9 questions, 15%) have been asked the most. AC Circuits has also led over the last five years, with 6 questions. AC Circuits has produced the most tough questions (5).

  1. 1In a circuit containing a pure resistor connected to an AC source,2026Alternating Current, Voltage and Power
  2. 2A light bulb rated W is connected to an AC source of V, Hz. The rms current through the bulb is2026Alternating Current, Voltage and Power
  3. 3A small town with a demand of of electric power at is situated away from an electric power generating station. Each wire of the two-wire tra2026Transformers
  4. 4In domestic electric mains supply, the voltage and the current are2025Alternating Current, Voltage and Power
  5. 5A sinusoidal voltage produced by an AC generator at any instant t is given by an equation t . The rms value of voltage and frequency are res2025Alternating Current, Voltage and Power
  6. 6A series LCR circuit containing an AC source of 100 V has an inductor and a capacitor of reactances and respectively. If a resistance of is 2025AC Circuits
  7. 7Which of the following combinations should be selected for better tuning of an circuit used for communication?2024Quality and Power Factor
  8. 8In an series circuit, the value of only capacitance is varied. The resulting variation of resonance frequency as a function of can be repres2024AC Circuits
  9. 9The figure shows variation of and with frequency in a series circuit. Then, for what frequency point is the circuit capacitive?2024AC Circuits
  10. 10Total impedance of a series circuit varies with angular frequency of the source connected to it as shown in the graph. The quality factor of2023AC Circuits
  11. 11In series circuit at resonance, the phase difference between voltage and current is2023AC Circuits
  12. 12An ideal transformer has a turns ratio of 10 . When the primary is connected to , as source, the power output is2023Transformers
  13. 13In a series circuit, , and , then impedance of the circuit is2022Alternating Current, Voltage and Power
  14. 14A series resonant circuit contains a capacitance and an inductor of . The frequency of electrical oscillations will be2022AC Circuits
  15. 15An alternating current is given by . The rms current is given by2022Alternating Current, Voltage and Power
  16. 16In an oscillating -circuit, and . At , the charge on the capacitor is zero and the current is . The maximum charge that will appear on the c2021AC Circuits
  17. 17The current following through an inductance coil of self-inductance at different time instants is as shown. The emf induced between and is n2021AC Circuits
  18. 18In the given circuit the peak voltage across , and are and , respectively. The rms value of the applied voltage is2020AC Circuits
  19. 19The power factor of circuit is . If the inductive reactance is . The value of resistance is2020Quality and Power Factor
  20. 20In the given circuit, the resonant frequency is2020Parallel AC Circuits
  21. 21The frequency of an alternating current is \( 50 {~Hz} \). What is the minimum time taken by current to reach its peak value from rms value?2019Alternating Current, Voltage and Power
  22. 22An inductor of inductance \( L \) and resistor \( R \) are joined together in series and connected by a source of frequency \( \). The power2019AC Circuits
  23. 23Which of the following represents the variation of inductive reactance \( (X_{L} ) \) with the frequency of voltage source \( ( {V}) \) ?2018AC Circuits
  24. 24A \( 100 {~W} \) bulb is connected to an \( {AC} \) source of \( 220 {~V}, 50 {~Hz} \). Then the current flowing through the bulb is2018Alternating Current, Voltage and Power
  25. 25In the series LCR, circuit the power dissipation is through2018AC Circuits
  26. 26In Karnataka, the normal domestic power supply AC is \( 220 {~V}, 50 {~Hz} . \) Here \( 220 {~V} \) and \( 50 {~Hz} \) refer to2018Alternating Current, Voltage and Power
  27. 27A step-up transformer operates on a \( 230 {~V} \) line and a load current of \( 2 {~A} \). The ratio of primary and secondary windings is \2018Transformers
  28. 28A substance of mass \( 49.53 {~g} \) occupies \( 1.5 {~cm}^{3} \) of volume. The density of the substance (in \( {g} \) \( . {cm}^{-3} ) \) 2017Alternating Current, Voltage and Power
  29. 29The minimum value of effective capacitance that can be obtained by combining \( 3 \) capacitors of capacitances \( 1 {pF}, 2 {pF} \) and \( 2017AC Circuits
  30. 30A capacitor of \( 8 {~F} \) is connected as shown. Charge on the plates of the capacitor2016AC Circuits
  31. 31The rms value of current in a \( 50 {~Hz} {AC} \) circuit is \( 6 {~A} \). The average value of \( {AC} \) current over a cycle is2016Alternating Current, Voltage and Power
  32. 32A capacitor of capacitance \( 10 {F} \) is connected to an AC source and an AC Ammeter. If the source voltage varies as \( V=50 {2} 100 t \)2016Alternating Current, Voltage and Power
  33. 33In a series L.C.R circuit, the potential drop across \( L, C \) and \( R \) respectively are \( 40 {~V}, 120 {~V} \) and \( 60 {~V} \). Then2016AC Circuits
  34. 34In a series L.C.R. circuit an alternating emf (v) and current (i) are given by the equation \( v=v_{0} t, l=i_{0} ( t+ { }{3} ) \) The avera2016Alternating Current, Voltage and Power
  35. 35If \( _{0} \) and \( _{0} \) are the permittivity and permeability of free space and \( \) and \( \) are the corresponding quantities for a 2015Transformers
  36. 36A person wants a real image of his own, \( 3 \) times enlarged. Where should he stand infront of a concave mirror of radius of curvature \( 2015AC Circuits
  37. 37If an electron in hydrogen atom jumps from an orbit of level \( n=3 \) to an orbit of level \( n=2 \). the emitted radiation has a frequency2015Alternating Current, Voltage and Power
  38. 38A force between two protons is same as the force between proton and neutron. The nature of the force is2014AC Circuits
  39. 39What is the value of shunt resistance required to convert a galvanometer of resistance \( 100 \) into an ammeter of range \( 1 {~A} \) ? Giv2014Alternating Current, Voltage and Power
  40. 40A circular coil of radius \( 10 {~cm} \) and \( 100 \) turns carries a current \( 1 {~A} \). What is the magnetic moment of the coil ?2014AC Circuits
  41. 41A susceptibility of a certain magnetic material is \( 400 \). What is the class of the magnetic material \( ? \)2014Transformers
  42. 42A solenoid of inductance \( 2 {H} \) carries a current of \( 1 {~A} \). What is the magnetic energy stored in a solenoid?2014Quality and Power Factor
  43. 43For a transformed, the turns ratio is 3 and its efficiency is . The current flowing in the primary coil is and the voltage applied to it is 2013Transformers
  44. 44In series circuit, the potential differences across each element is . Now the value of the resistance alone is doubled, then P.D. across and2013AC Circuits
  45. 45A series combination of resistor , capacitor (C) is connected to an A.C. source of angular frequency . Keeping the voltage same, if the freq2013AC Circuits
  46. 46A resistor of , an inductance of are in series with an AC which is given by . The power factor of the combination is2012Quality and Power Factor
  47. 47An ideal resistance , ideal inductance , ideal capacitance and voltmeters and are connected to an AC sources as shown in figure. At resonanc2012AC Circuits
  48. 48In an circuit, and are given by volt and amp. The power dissipated in the circuit is2011Alternating Current, Voltage and Power
  49. 49In the series circuit shown, the impedance is2011Alternating Current, Voltage and Power
  50. 50A transformer works on the principle of2011Transformers

Frequently Asked Questions

1.How many questions are available for Alternating Current?

This chapter includes 59 questions compiled from KCET papers spanning 2007 to 2026.

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

These are KCET 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 KCET Physics?

Alternating Current has appeared in 20 of the 20 years of KCET papers covered here, with 59 questions across 20 papers - about 3 per paper it appears in.

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

Of the 59 questions analysed for this chapter, 54% are easy, 34% moderate and 12% tough. 2018 had the most, with 5 questions.

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

These topics have carried the most weightage in Alternating Current:

  • AC Circuits - 26 questions (44%)
  • Alternating Current, Voltage and Power - 19 questions (32%)
  • Transformers - 9 questions (15%)
  • AC Circuits has produced the most tough questions (5).
6.Is Alternating Current's weightage in KCET going up or down?

Across all 20 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.