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Alternating Current Questions

Practice 36 Alternating Current questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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36
Total Questions
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5
Easy
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22
Medium
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9
Hard
Practice by Exam:Physics(34)PHYSICS(2)

About Alternating Current — practice questions, PYQs & concepts

Alternating Current is a frequently-tested topic on Physics, PHYSICS. ExamTest.live currently lists 36 Alternating Current questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Alternating Current weight in competitive exams

Across our Alternating Current question bank, the largest sources are Physics (34) and PHYSICS (2). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 5 easy Alternating Current questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
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All Alternating Current Questions(1–36 of 36)

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Q1easymcqPhysicsAIEEE 20042026
0% accuracy
Alternating current cannot be measured by a D.C. ammeter because:
Q2hardmcqPhysicsAIEEE 20042026
0% accuracy
In a uniform magnetic field of induction , a wire in the form of a semicircle of radius rotates about the diameter of the circle with angular frequency . The axis of rotation is perpendicular to the field. If the total resistance of the circuit is , the mean power generated per period of rotation is:
Q3easymcqPhysicsAIEEE 20042026
50% accuracy
In a LCR circuit, capacitance is changed from to . For the resonant frequency to remain unchanged, the inductance should be changed from to:
Q4mediummcqPhysicsAIEEE 20042026
0% accuracy
In an LCR series a.c. circuit, the voltage across each of the components, and is . The voltage across the combination will be:
Q5mediummcqPhysicsAIEEE 20072026
0% accuracy
In an a.c. circuit the voltage applied is . The resulting current in the circuit is . The power consumption in the circuit is given by:
Q6hardmcqPhysicsAIEEE 20062026
0% accuracy
In a series resonant LCR circuit, the voltage across is and with . The resonant frequency is . At resonance, the voltage across is:
Q7hardmcqPhysicsNEET 20232026
An AC source is connected to a capacitor . Due to a decrease in its operating frequency:
Q8mediummcqPhysicsNEET 2020 E12026
A capacitor is connected to a , ac supply. The rms value of the current in the circuit is, nearly:
Q9hardmcqPhysicsNEET 20212026
A series LCR circuit containing inductor, capacitor and resistor is connected to variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be:
Q10mediummcqPhysicsNEET 20212026
An inductor of inductance , a capacitor of capacitance and a resistor of resistance are connected in series to an ac source of potential difference volts. Potential difference across and is and , respectively. The amplitude of current flowing through LCR series circuit is . The impedance of the circuit is:
image
Q11mediummcqPhysicsNEET 20212026
A step down transformer connected to an ac mains supply of is made to operate at lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
Q12hardmcqPhysicsNEET 20222026
A series LCR circuit with inductance , capacitance , resistance is connected to an ac source of voltage, . If the resonant frequency of the LCR circuit is and the frequency of the ac source is , then:
Q13easymcqPhysicsNEET 20222026
The peak voltage of the AC source is equal to:
Q14mediummcqPhysicsNEET 20232026
In a series LCR circuit, the inductance is , capacitance is and resistance is . The frequency at which resonance occurs is:
Q15hardmcqPhysicsNEET 20232026
The net impedance of the circuit (as shown in figure) will be:
image
Q16hardmcqPhysicsNEET 2020 E12026
A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is . If instead C is removed from the circuit, the phase difference is again between current and voltage. The power factor of the circuit is:
Q17mediummcqPhysicsStaff Selection Commission2026
A transformer can do all of the following electrical functions except:
Q18mediummcqPhysicsIndian Competitive Exam Prep2026
Which electrical quantity is increased in a step-down transformer?
Q19easymcqPHYSICSNEET 20192026
The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?
image
Q20mediummcqPHYSICSNEET 20192026
A circuit when connected to an AC source of gives a current of . The same circuit when connected to a DC source of , gives a current of . The circuit is:
Q21hardmcqPhysicsNEET (UG) 20182026
An inductor , a capacitor and a resistor are connected in series across a source of emf, . The power loss in the circuit is:
Q22mediummcqPhysicsPhysics
2% accuracy
To an ac power supply of at , a resistor of , a capacitor of reactance and an inductor of reactance are connected in series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively:
Q23mediummcqPhysicsPhysics
0% accuracy
An ac voltage is applied to a resistance and inductor in series. If and the inductive reactance are both equal to , the phase difference between the applied voltage and the current in the circuit is:
Q24mediummcqPhysicsPhysics
0% accuracy
In an ac circuit an alternating voltage volts is connected to capacitor of capacity . The r.m.s. value of the current in the circuit is:
Q25mediummcqPhysicsPhysics
A series R-C circuit is connected to an alternating voltage source. Consider two situations:(i) When capacitor is air filled.(ii) When capacitor is mica filled.Current through resistor is and voltage across capacitor is then:
Q26hardmcqPhysicsPhysics
In an electrical circuit and an a.c voltage source are all connected in series. When is removed, the phase difference is . If instead is removed, the phase difference is again . The power factor of the circuit is:
Q27mediummcqPhysicsPhysics
and . Average power in Watts is:
Q28easymcqPhysicsPhysics
Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?
Q29mediummcqPhysicsPhysics
The potential differences across the resistance, capacitance and inductance are and respectively in an L-C-R circuit. The power factor of this circuit is:
Q30mediummcqPhysicsPhysics
A coil has and at . If connected to source, the current is:
Q31mediummcqPhysicsPhysics
For the potential shown in the figure (triangular wave), the value is:
image
Q32mediummcqPhysicsPhysics
Power dissipated in an LCR series circuit connected to an a.c source of emf is:
Q33mediummcqPhysicsPhysics
In an a.c. circuit the e.m.f. () and the current () at any instant are given respectively by and . The average power in the circuit over one cycle of a.c. is:
Q34mediummcqPhysicsPhysics
The circuit shown below acts as:

image
Q35mediummcqPhysicsPhysics
A a.c. source of is connected across and as shown in figure. The voltage across is . The voltage across is:

image
Q36mediummcqPhysicsPhysics
The voltage gain of the following amplifier is:

image

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