Physics - Alternating Current
Practise 16 WBJEE previous year questions on Alternating Current, compiled from papers spanning 2009 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 WBJEE tests.
Alternating Current has been asked in 12 of the 18 years of WBJEE papers analysed (2009–2026), with 16 questions in all. 56% of them were easy, 31% moderate and 13% tough. Most of its questions came from 2024, with 2 questions that year. In the last three years (2024–2026) it had 4 questions across 3 papers, about 1.3 per paper.
The chapter's 2 topics are not weighted equally: Alternating Current, Voltage and Power (8 questions, 50%) and AC Circuits (8 questions, 50%) have been asked the most. Over the last five years the most frequent topics have been AC Circuits (4) and Alternating Current, Voltage and Power (2). Alternating Current, Voltage and Power has produced the most tough questions (1).
- 1A resistor of resistance ' ' draws power ' ' when connected to an AC source. If an inductance is now placed in series with , such that the i2026AC Circuits
- 2For a domestic AC supply of 220 V at 50 cycles per sec, the potential difference between the terminals of a two-pin electric outlet in a roo2025Alternating Current, Voltage and Power
- 3In a series LCR circuit, the rms voltage across the resistor and the capacitor are 30 V and 90 V respectively. If the applied voltage is , t2024AC Circuits
- 4The variation of impedance Z of a series LCR circuit with frequency of the source is shown in the figure. Which of the following statement(s2024Alternating Current, Voltage and Power
- 5In a closed circuit there is only a coil of inductance and resistance . The coil is situated in a uniform magnetic field. All on a sudden, t2022AC Circuits
- 6When an source of emf with frequency is connected across a circuit, the phase difference between and current I in the circuit is observed to2022AC Circuits
- 7The rms value of potential difference shown in the figure is2021Alternating Current, Voltage and Power
- 8Consider a pure inductive A.C. circuit as shown in the figure. If the average powr consumed is , then2021Alternating Current, Voltage and Power
- 9Consider the circuit shown. If all the cells have negligible internal resistance, what will be the current through the resistor when steady 2020AC Circuits
- 10When a inductor and a resistor are connected in series with an AC voltage source, the voltage leads the current by . If the inductor is repl2019Alternating Current, Voltage and Power
- 11A parallel plate capacitor in series with a resistance of , an inductor of and an AC voltage source of variable frequency shows resonance at2019AC Circuits
- 12An altermating current is flowing through a series circuit. It is found that the current reaches a value of at both and frequency. What is t2018AC Circuits
- 13When the frequency of the voltage applied to a series LCR circuit is gradually increased from a low value, the impedance of the circuit2017Alternating Current, Voltage and Power
- 14In the circuit shown below, the switch is kept in position for a long time and is then thrown to position The amplitude of the resulting osc2015AC Circuits
- 15An alternating current in a circuit is given by A. The r.m.s. value and the frequency of current respectively are2013Alternating Current, Voltage and Power
- 16An alternating current of rms value is passed through a resistor. The maximum potential difference across the resistor is2009Alternating Current, Voltage and Power
Frequently Asked Questions
1.How many questions are available for Alternating Current?
This chapter includes 16 questions compiled from WBJEE papers spanning 2009 to 2026.
2.Are these questions only from WBJEE, or from other exams too?
These are WBJEE 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 WBJEE Physics?
Alternating Current has appeared in 12 of the 18 years of WBJEE papers covered here, with 16 questions across 12 papers - about one per paper it appears in.
4.What is the difficulty level of Alternating Current questions in WBJEE?
Of the 16 questions analysed for this chapter, 56% are easy, 31% moderate and 13% tough. 2024 had the most, with 2 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 - 8 questions (50%)
- AC Circuits - 8 questions (50%)
- Alternating Current, Voltage and Power has produced the most tough questions (1).
6.Is Alternating Current's weightage in WBJEE going up or down?
Across all 12 papers analysed, Alternating Current has averaged about 1.3 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 1.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.