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Physics - Alternating Current

Practise 35 AIIMS previous year questions on Alternating Current, compiled from papers spanning 2001 to 2019. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AIIMS tests.

Alternating Current has been asked in 18 of the 19 years of AIIMS papers analysed (2001–2019), with 35 questions in all. 57% of them were easy, 29% moderate and 14% tough. Most of its questions came from 2019, with 4 questions that year. In the last three years (2017–2019) it had 9 questions across 5 papers, about 1.8 per paper.

The chapter's 5 topics are not weighted equally: AC Circuits (21 questions, 60%), Transformers (6 questions, 17%), and Alternating Current, Voltage and Power (5 questions, 14%) have been asked the most. AC Circuits has produced the most tough questions (2).

  1. 1In a oscillatory circuit, find the energy stored in inductor at resonance if voltage of source is , resistance is and inductance .26 May, 2019AC Circuits
  2. 2In LCR series circuit, source voltage is and voltage across inductor . If voltage drop across resistance is , then determine voltage in capa26 May, 2019AC Circuits
  3. 3Assertion : A capacitor of suitable capacitance can be used in an AC circuit in place of the choke coil. Reason : A capacitor blocks DC and 26 May, 2019Alternating Current, Voltage and Power
  4. 4In a transformer number of turns in primary circuit is 500 and in secondary circuit number of turns is 10 . The load resistance is and volta25 May, 2019Transformers
  5. 5A series combination of resistor and capacitor is connected to an AC source of angular frequency . Keeping the voltage same, if the frequenc27 May, 2018AC Circuits
  6. 6The voltage across a pure inductor is represented in figure. Which one of the following curves in the figure will represent the current?26 May, 2018Alternating Current, Voltage and Power
  7. 7An electric bulb has a rated power of at . If it is used on an AC source of , , a choke has to be used in series with it. This choke should 26 May, 2018AC Circuits
  8. 8In an circuit as shown in figure, both switches are open initially. Now switch is closed, kept open. ( is charge on the capacitor and is cap2017Parallel AC Circuits
  9. 9A transformer with efficiency works at and . If the secondary voltage is , then the primary and secondary currents are respectively2017Transformers
  10. 10A series resonant circuit has a quality factor (Q-factor) 0.4 . If , then the value of inductance is2016AC Circuits
  11. 11Assertion : At resonance, series circuit have a minimum current. Reason : At resonance, in LCR series circuit, the current and e.m.f are not2016AC Circuits
  12. 12A coil of inductance is connected to a capacitor of capacitance . To what wavelength is this circuit tuned?2015AC Circuits
  13. 13The most suitable metal for making electromagnets and transformer cores is2014Transformers
  14. 14An inductive circuit contains a resistance of and an inductance of . If an voltage of and frequency is applied to this circuit, the current 2014AC Circuits
  15. 15In an oscillating system, a restoring force is a must. In an circuit, restoring force is provide by2013AC Circuits
  16. 16In an circuit, voltage and inductor is connected across the circuit. Then the instantaneous power will be2012Alternating Current, Voltage and Power
  17. 17In a given series circuit and , the current2012AC Circuits
  18. 18Which of the following parameter in the series LCR circuit is analogous to driving force in mechanics?2012AC Circuits
  19. 19What is the mechanical equivalent of spring constant in LC oscillating circuit?2011AC Circuits
  20. 20In series circuit, the phase difference between applied voltage and current is2011AC Circuits
  21. 21Alternating current cannot be measured by D.C. ammeter because2010Alternating Current, Voltage and Power
  22. 22The core of any transformer is laminated so as2010Transformers
  23. 23In a series circuit, the voltage across the resistance, capacitance and inductance is each. If the capacitance is short circuited the voltag2009AC Circuits
  24. 24Assertion: Transformers are used only in alternating current source not in direct current. Reason : Only a.c. can be stepped up or down by m2009Transformers
  25. 25If frequency of \(R-L\) circuit is \(f\) then impedence will be2008AC Circuits
  26. 26When \(100 {~V}\) d.c. is applied across a coil, a current of 1 A flows through it. When \(100 {~V}\) a.c. of \(50 {~Hz}\) is applied to the2008AC Circuits
  27. 27Assertion : The alternating current lags behind the e.m.f. by a phase angle of \( / 2\), when AC flows through an inductor. Reason : The ind2008Alternating Current, Voltage and Power
  28. 28In an \(A C\) circuit the potential differences across an inductance and resistance joined in series are respectively \(16 {~V}\) and \(20 {2007AC Circuits
  29. 29Assertion : No power loss associated with pure capacitor in ac circuit. Reason : No current is flowing in this circuit.2007Quality and Power Factor
  30. 30Given below is the circuit diagram of an AM demodulator. For good demodulation of AM signal of carrier frequency , the value of should be2006AC Circuits
  31. 31A a.c. source of 20 volts is connected across and as shown in figure. The voltage across is 12 volt. The voltage across is2005AC Circuits
  32. 32The circuit shown in the figure acts as2005Parallel AC Circuits
  33. 33A capacitor of capacitance is connected in the tank circuit of an oscillator oscillating with a frequency of . If the current flowing in the2003AC Circuits
  34. 34Assertion : We use a thick wire in the secondary of a step down transformer to reduce the production heat. Reason : When the plane of the ar2002Transformers
  35. 35If in a circuit current lags behind EMF by . Then it is a/an2001AC Circuits

Frequently Asked Questions

1.How many questions are available for Alternating Current?

This chapter includes 35 questions compiled from AIIMS papers spanning 2001 to 2019.

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

These are AIIMS questions specifically for the Alternating Current chapter. Questions from other exams like NEET or JIPMER are organised separately under their respective exam sections.

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

Alternating Current has appeared in 18 of the 19 years of AIIMS papers covered here, with 35 questions across 20 papers - about 2 per paper it appears in.

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

Of the 35 questions analysed for this chapter, 57% are easy, 29% moderate and 14% tough. 2019 had the most, with 4 questions.

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

These topics have carried the most weightage in Alternating Current:

  • AC Circuits - 21 questions (60%)
  • Transformers - 6 questions (17%)
  • Alternating Current, Voltage and Power - 5 questions (14%)
  • AC Circuits has produced the most tough questions (2).
6.Is Alternating Current's weightage in AIIMS going up or down?

Across all 20 papers analysed, Alternating Current has averaged about 1.8 questions per paper. In the last three years (2017–2019), that average has stayed about the same, at about 1.8 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.