HomeTestsSearchRankProfile

Alternating Current Questions

Practice 34 Alternating Current questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

📚
34
Total Questions
🟢
5
Easy
🟡
20
Medium
🔴
9
Hard
Practice by Exam:Physics(32)PHYSICS(2)

About Alternating Current — practice questions, PYQs & concepts

Alternating Current is a frequently-tested topic on Physics, PHYSICS. ExamTest.live currently lists 34 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 (32) 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.
  • Time yourself: Every question shows the average solve time so you can benchmark your speed against other students.
  • Read every explanation: Even on questions you got right — the explanation often surfaces a faster approach you can reuse.

All Alternating Current Questions(1–34 of 34)

Filter:
Q1easymcqPhysicsAIEEE 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:
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:
Q3mediummcqPhysicsAIEEE 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:
Q4easymcqPhysicsAIEEE 20042026
0% accuracy
Alternating current cannot be measured by a D.C. ammeter because:
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:
Q7mediummcqPhysicsNEET 2020 E12026
A capacitor is connected to a , ac supply. The rms value of the current in the circuit is, nearly:
Q8easymcqPHYSICSNEET 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
Q9hardmcqPhysicsNEET 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:
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
Q11hardmcqPhysicsNEET 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:
Q12mediummcqPhysicsNEET 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?
Q13easymcqPhysicsNEET 20222026
The peak voltage of the AC source is equal to:
Q14hardmcqPhysicsNEET 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:
Q15mediummcqPhysicsNEET 20232026
In a series LCR circuit, the inductance is , capacitance is and resistance is . The frequency at which resonance occurs is:
Q16hardmcqPhysicsNEET 20232026
An AC source is connected to a capacitor . Due to a decrease in its operating frequency:
Q17hardmcqPhysicsNEET 20232026
The net impedance of the circuit (as shown in figure) will be:
image
Q18mediummcqPHYSICSNEET 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:
Q19hardmcqPhysicsNEET (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:
Q20mediummcqPhysicsPhysics
3% 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:
Q21mediummcqPhysicsPhysics
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:
Q22mediummcqPhysicsPhysics
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:
Q23mediummcqPhysicsPhysics
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:
Q24hardmcqPhysicsPhysics
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:
Q25mediummcqPhysicsPhysics
and . Average power in Watts is:
Q26easymcqPhysicsPhysics
Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?
Q27mediummcqPhysicsPhysics
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:
Q28mediummcqPhysicsPhysics
A coil has and at . If connected to source, the current is:
Q29mediummcqPhysicsPhysics
For the potential shown in the figure (triangular wave), the value is:
image
Q30mediummcqPhysicsPhysics
Power dissipated in an LCR series circuit connected to an a.c source of emf is:
Q31mediummcqPhysicsPhysics
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:
Q32mediummcqPhysicsPhysics
The circuit shown below acts as:

image
Q33mediummcqPhysicsPhysics
A a.c. source of is connected across and as shown in figure. The voltage across is . The voltage across is:

image
Q34mediummcqPhysicsPhysics
The voltage gain of the following amplifier is:

image

Frequently Asked Questions

How many Alternating Current questions are on ExamTest.live?▼
We have 34 Alternating Current questions spread across 1 pages, covering easy, medium, and hard difficulty levels with detailed explanations.
Are Alternating Current MCQs free?▼
Yes. All Alternating Current questions, answers, and explanations on ExamTest.live are completely free. No account or subscription required.
Which exams include Alternating Current questions?▼
Alternating Current questions are commonly asked in Physics, PHYSICS. You can filter by exam using the links above.
How do I practice Alternating Current questions effectively?▼
Start with easy questions to build confidence, then tackle medium and hard ones. Use the filter buttons to sort by difficulty. Reveal the answer only after attempting each question, and read the explanation thoroughly.