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MCQ for Full Syllabus Physics Alternating Current
Full Syllabus Physics students should review the 50 questions and answers to strengthen understanding of core concepts in Alternating Current
Alternating Current MCQ Questions Full Syllabus Physics with Answers
Question: An inductor of inductance L = 400 mH and resistors of resistance R1 = 2Ω and R2 = 2Ω are connected to a battery of emf 12 V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is
- a)
- b)
- c) 12e–5t V
- d) 6e–5t V
Answer: 12e–5t V
Question: A resistor of resistance R, capacitor of capacitance C and inductor of inductance L are connected in parallel to AC power source of voltage ε0 sin ωt. The maximum current through the resistance is half of the maximum current through the power source. Then value of R is
- a)
- b)
- c)
- d) None of these
Answer:
Question: A direct current of 5A is superposed on an alternating current I = 10 sin wt flowing through the wire. The effective value of the resulting current will be
- a) (15/2)A
- b) 5 √3A
- c) 5 √5A
- d) 15 A
Answer: 5 √3A
Question: In the circuit shown below, the ac source has voltage V = 20 cos(ωt) volt with ω = 2000 rad/s. The amplitude of the current will be nearest to
- a) 2A
- b) 3.3A
- c) 2 / √5A
- d) 5A
Answer: 2A
Question: An inductor 20 × 10–3 henry, a capacitor 100μF and a resistor 50Ω are connected in series across a source of EMF V = 10 sin 314t. If resistance is removed from the circuit and the value of inductance is doubled, then the variation of current with time in the new circuit is –
- a) 0.52 cos 314 t
- b) 0.52 sin 314 t
- c) 0.52 sin (314 t + π/3)
- d) None of these
Answer: 0.52 cos 314 t
Question: A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applied to a series LCR circuit in which R = 3Ω, L = 25.48 mH, and C = 796 μF. Find the impedance of the circuit
- a) 5 Ω
- b) 12 Ω
- c) 18 Ω
- d) 22 Ω
Answer: 5 Ω
Question: In an LCR circuit, the voltages across the components are VL, VC and VR respectively. The voltage of source will be
- a) [VR + VL + VC]
- b) [VR 2 + VL 2 + VC 2]1/2
- c) [VR 2 + (VL + VC)2]1/2
- d) [VR 2 + (VL – VC)2]1/2
Answer: [VR 2 + (VL – VC)2]1/2
Question: The r.m.s. value of potential difference V shown in the figure is
- a) V0
- b) V0 /√2
- c) V0/2
- d) V0 √3
Answer: V0 /√2
Question: Which one of the following curves represents the variation of impedance (Z) with frequency f in series LCR circuit?
- a)
- b)
- c)
- d)
Answer:
Question: An alternating voltage V = V0 sin wt is applied across a circuit. As a result, a current I = I0 sin (ωt – π/2) flows in it. The power consumed per cycle is
- a) zero
- b) 0.5 V0I0
- c) 0.707 V0I0
- d) 1.414 V0I0
Answer: zero
Question: A resistance R and inductance L and a capacitor C all are connected in series with an AC supply. The resistance of R is 16 ohm and for a given frequency, the inductive reactance of L is 24 ohm and capacitive reactance of C is 12 ohm. If the current in the circuit is 5 amp., find the potential difference across R, L and C.
- a) 30, 20, 50 volt
- b) 40, 100, 60 volt
- c) 70, 110, 60 volt
- d) 80, 120, 60 volt
Answer: 80, 120, 60 volt
Question: The instantaneous current from an a.c. source is I = 6 sin 314 t. What is the rms value of the current ?
- a) 3 √2 amp
- b) 2 √2 amp
- c) √2 amp
- d) 2 amp
Answer: 3 √2 amp
Question: A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be
- a) 4.0 A
- b) 8.0 A
- c) 7.2 A
- d) 2.0 A
Answer: 4.0 A
Question: The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an A.C. supply of 120 V and the current flowing in it is 10 A. The voltage and the current in the secondary are
- a) 240 V, 5 A
- b) 240 V, 10 A
- c) 60 V, 20 A
- d) 120 V, 20 A
Answer: 240 V, 5 A
Question: A resistance of 400Ω is connected in series with an inductor of (3/π) H and this combination is connected across an A.C. source as shown in figure
- a) In the circuit, peak value of current is
A - b) In the circuit, potential difference across resistance is in same phase with the current
- c) In the circuit, potential difference across inductor is 53º leading with current
- d) In the circuit, potential difference across inductor is 37º leading with current
Answer: In the circuit, potential difference across resistance is in same phase with the current
Question: Which of the following curves correctly represents the variation of capacitive reactance (Xc) with frequency n –
- a)
- b)
- c)
- d)
Answer:
Question: If I = I0 sin (ωt – π/2), and E = E0 sinwt then the power loss is
- a)
- b)
- c)
- d) Zero
Answer: Zero
Question: A resistance R and inductance L and a capacitor C all are connected in series with an AC supply. The resistance of R is 16 ohm and for a given frequency, the inductive reactance of L is 24 ohm and capacitive reactance of C is 12 ohm. If the current in the circuit is 5 amp., find the potential difference across R, L and C.
- a) 30, 20, 50 volt
- b) 40, 100, 60 volt
- c) 70, 110, 60 volt
- d) 80, 120, 60 volt
Answer: 80, 120, 60 volt
Question: The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an A.C. supply of 120 V and the current flowing in it is 10 A. The voltage and the current in the secondary are
- a) 240 V, 5 A
- b) 240 V, 10 A
- c) 60 V, 20 A
- d) 120 V, 20 A
Answer: 240 V, 5 A
Question: A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be
- a) 4.0 A
- b) 8.0 A
- c) 7.2 A
- d) 2.0 A
Answer: 4.0 A
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MCQs for Alternating Current Physics Full Syllabus
Students can use these MCQs for Alternating Current to quickly test their knowledge of the chapter. These multiple-choice questions have been designed as per the latest syllabus for Full Syllabus Physics released by BITSAT. Our expert teachers suggest that you should practice daily and solving these objective questions of Alternating Current to understand the important concepts and better marks in your school tests.
Alternating Current NCERT Based Objective Questions
Our expert teachers have designed these Physics MCQs based on the official NCERT book for Full Syllabus. We have identified all questions from the most important topics that are always asked in exams. After solving these, please compare your choices with our provided answers. For better understanding of Alternating Current, you should also refer to our NCERT solutions for Full Syllabus Physics created by our team.
Online Practice and Revision for Alternating Current Physics
To prepare for your exams you should also take the Full Syllabus Physics MCQ Test for this chapter on our website. This will help you improve your speed and accuracy and its also free for you. Regular revision of these Physics topics will make you an expert in all important chapters of your course.
You can get most exhaustive BITSAT Physics Alternating Current MCQs for free on StudiesToday.com. These MCQs for Full Syllabus Physics are updated for the 2025-26 academic session as per BITSAT examination standards.
Yes, our BITSAT Physics Alternating Current MCQs include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the BITSAT paper is now competency-based.
By solving our BITSAT Physics Alternating Current MCQs, Full Syllabus students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Physics.
Yes, Physics MCQs for Full Syllabus have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused BITSAT exams.
Yes, you can also access online interactive tests for BITSAT Physics Alternating Current MCQs on StudiesToday.com as they provide instant answers and score to help you track your progress in Physics.