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Physics - Alternating Current

Practise 44 NTA Abhyas (JEE Main) questions on Alternating Current. Each question shows a quick preview so you can jump straight to the topic you want to revise.

Alternating Current has been asked in 0 of the 25 years of NTA Abhyas (JEE Main) papers analysed (2002–2026), with 44 questions in all. 100% of them were easy, 0% moderate and 0% tough. Most of its questions came from 2026, with 0 questions that year. In the last three years (2024–2026) it had 0 questions across 49 papers, about 0 per paper.

All of the chapter's questions come from a single topic, Uncategorized.

  1. 1A bulb is rated at 100 V , 100 W , it can be treated as a resistor. Find out the inductance of an inductor (called choke coil) that should b
  2. 2An AC circuit drawing power from a source of angular frequency 50 rad s - 1 has a power factor of 0.6 . In this condition, a resistance of 1
  3. 3The frequency of oscillation of current in the inductor is-
  4. 4A coil having inductance L and resistance R is connected to a battery of emf ε at t = 0 . If t 1 and t 2 are the times for 90 % and 99 % com
  5. 5In the circuit shown in the figure, E = 15 V , R 1 = 1 Ω , R 2 = 1 Ω , R 3 = 2 Ω and L = 1 . 5 H . The currents flowing through R 1 , R 2 an
  6. 6An inductor of inductance 2.0 mH is connected across a charged capacitor of capacitance 5.0 μ F and the resulting L-C circuit is set oscilla
  7. 7A transformer with efficiency 80 % works at 4 kW and 100 V . If the secondary voltage is 200 V , then the primary and secondary currents are
  8. 8An A.C. voltage V = 5 cos ⁡ 1000 t V is applied to an L - R series circuit of inductance 3 mH and resistance 4 Ω . The value of the maximum
  9. 9The RMS value of AC which when passed through a resistor produces heat, which is twice that produced by a steady current of 1.414 A in the s
  10. 10If the rms value of the voltage of the waveform shown below is p q V , then what is the value of p + q ? ( p and q are the smallest positive
  11. 11The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an AC supply of 120
  12. 12An ac source of 50 V (r.m.s value) is connected across a series R - C circuit. If the r.m.s voltage across the resistor is 40 V , then the r
  13. 13An LCR series circuit is connected to an oscillator (AC supply) having RMS voltage 200 V . If the RMS voltages across resistor, inductor and
  14. 14A telephone wire of length 200 km has a capacitance of 0.014 μ F km - 1 . If it carries an AC frequency of 5 kHz, what should be the value o
  15. 15In an LCR circuit, the resonant frequency is 600 Hz and half-power points are at 650 Hz and 550 Hz . The quality factor is
  16. 16A capacitor of capacitance 10 μ F is connected to an AC ammeter. If the source voltage varies as V = 50 2 sin ⁡ 100 t , the reading of the a
  17. 17An inductor ( L = 0.03 H ) and a resistor ( R = 0.15 kΩ ) are connected in series to a battery of 15 V EMF in a circuit shown below. The key
  18. 18A power transmission line feeds input power at 2400 V to a step-down transformer and which delivers power at 240 V with its primary windings
  19. 19The output of a step down transformers is measured to be 48 V when connected to a 12 W bulb. The value of peak current is
  20. 20In the given circuit the R.M.S. values of voltages across the capacitor C , inductor L and resistor R 1 are 12 V , 10 V and 5 V respectively
  21. 21The steady-state current through L 1 after the switch has been closed for a very long time is
  22. 22In the adjacent circuit, the instantaneous current equation is
  23. 23A power transmission line feeds input power at 2400 V to a step-down transformer which delivers power at 240 V with its primary windings hav
  24. 24The resonance frequency of LCR series a.c. circuit is f 0 . Now the capacitance is made 4 times, then the new resonance frequency will becom
  25. 25An inductor coil and a capacitor and a resistance of 5 Ω are connected in series to an a.c. source of rms voltage 30 V. When the frequency o
  26. 26In a series LCR circuit, the voltage drop across the resistance is 8 V , across the inductor is 6 V and across the capacitor is 12 V . Then,
  27. 27A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A . The efficiency of the transformer i
  28. 28In the circuit shown in diagram, switch S is closed at time t = 0 . The charge which passes through the battery in one time constant is
  29. 29An inductor of inductance L = 400 mH and resistors of R 1 = 2 Ω and R 2 = 2 Ω are connected to a battery emf 12 V as shown in the figure. Th
  30. 30A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the current is 0 . 5 A , the efficiency of the transformer is
  31. 31An alternating current is given by i = i 1 cos ωt + i 2 sin ωt . The value of rms current is
  32. 32A series L C R circuit with 100 resistance is connected to an ac source of 200 V with an angular frequency of 300 rad s - 1 . If only the ca
  33. 33A transformer having an efficiency of 90 % is working on 200 V , 3 kW power supply. If the current in the secondary coil is 6 A , then the v
  34. 34An AC e.m.f E = 4 cos ⁡ 1000 t V is applied to an L R circuit containing inductance 3 m H and resistance 4 Ω . The amplitude of the current
  35. 35In the given circuit the R.M.S. values of voltages across the capacitor C , inductor L and resistor R 1 are 12 V , 10 V and 5 V respectively
  36. 36The reading of the ammeter and voltmeter are (Both the instruments are ac meters and measures rms value) -
  37. 37In a transformer the number of primary turns is four times that of the secondary turns. Its primary is connected to an AC source of voltage
  38. 38A coil having inductance L and resistance R is connected to a battery of emf ε at t = 0 . If t 1 and t 2 are the time for 90 % and 99 % comp
  39. 39The power factor of an L-R series circuit is 0 . 5 and that of a C-R series circuit is 0 . 2 . If the elements ( L , C a n d R ) of the two
  40. 40The natural frequency of an L - C circuit is 125000 cycles / s . When a dielectric medium of dielectric constant K is introduced between the
  41. 41In an AC circuit, the instantaneous values of emf and current are Ε = 200 sin 300 t V and i = 2 sin ⁡ 300 t + π 3 A respectively. The averag
  42. 42In the circuit shown, current measured by ammeter is x ampere. Find x .
  43. 43In the circuit shown in the figure, the switch was kept in p o s i t i o n - 1 for a very long time and then at t = 0 it is shifted to p o s
  44. 44The figure below shows a battery of emf ε connected to an inductor L and a resistance R in series. If the switch is closed at t = 0 , then t

Frequently Asked Questions

1.How many questions are available for Alternating Current?

This chapter includes 44 NTA Abhyas (JEE Main) questions.

2.Are these questions only from NTA Abhyas (JEE Main), or from other exams too?

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

3.What is the difficulty level of Alternating Current questions in NTA Abhyas (JEE Main)?

Of the 44 questions analysed for this chapter, 100% are easy, 0% moderate and 0% tough. 2026 had the most, with 0 questions.

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

All of this chapter's questions come from a single topic: Uncategorized.