Alternating Current-5
Class 12 Physics Science

MCQ Questions Class 12 Alternating Current With Answers

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CBSE Class 12 Alternating Current Multiple Choice Questions with Answers. MCQ Questions Class 12 Alternating Current with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Alternating Current MCQs with Answers to know their preparation level.

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Students who are searching for NCERT MCQ Questions for Class 12 Alternating Current with Answers are compiled here to get good practice on all fundamentals. Know your preparation level on MCQ Questions for Class 12 Alternating Current with Answers. You can also verify your answers from our provided MCQ Class 12 Alternating Current with Answers. So, ace up your preparation with MCQ of Class 12 Physics Examinations.

MCQ Questions Class 12 Alternating Current with Answers - Set - 5

Question 1: 

In the above problem, the value of the resistance of the coil Y is:
(a) 0.58 Ω
(b) 5.8 Ω
(c) 1.16 Ω
(d) 11.6 Ω

Correct Answer – (B)

Question 2 : 

The current through an inductor of 1H is given by I = 3t sin t. The voltage across the inductor of 1 H is:
(a) 3 sin t + 3 cos t
(b) 3 sin t + 3t cos t
(c) 3 cos t + t sin t
(d) 3t cos t + sin t

Correct Answer – (B)

Question 3 : 

A capacitor of capacitance 2μF is connected in the tank circuit of an oscillator oscillating with a frequency of 1 kHz. If the current flowing in the circuit is 2 m A, the voltage across the capacitor will be : 
(a) 0.16 V
(b) 0.32 V
(c) 79.5 V
(d) 159 V

Correct Answer – (A)

Question 4 : 

The coefficient of mutual inductance, when magnetic flux changes by 2 × 10–2 Wb and current changes by 0.01 A is 
(a) 8 henry
(b) 4 henry
(c) 3 henry
(d) 2 henry

Correct Answer – (D)

Question 5 : 

In a circuit the coil of a choke : 
(a) decreases the current
(b) increases the current
(c) has high resistance to D. C. circuit
(d) no effect with the current

Correct Answer – (A)

MCQ Questions Class 12 Alternating Current with Answers

Question 6 : 

Two coils X and Y are connected in series across a 240 V, 50 Hz supply. The resistance of X is 5Ω and inductance of Y is 0.02 H. The power consumed is 3 kW and the power factor is 0.75. The impedance of the circuit is:
(a) 0.144 Ω
(b) 1.44 Ω
(c) 14.4 Ω
(d) 144 Ω

Correct Answer – (C)

Question 7 : 

In an AC circuit the potential differences across an inductance and resistance joined in series are respectively 16 V and 20 V. The total potential difference of the source is 
(a) 20.0 V
(b) 25.6 V
(c) 31.9 V
(d) 53.5 V

Correct Answer – (B)

Question 8 : 

In an ideal parallel LC circuit, the capacitor is charged by connecting it to a D.C. source which is then disconnected. The current in the circuit
(a) becomes zero instantaneously 
(b) grows monotonically
(c) decays monotonically
(d) oscillates instantaneously

Correct Answer – (D)

Question 9 : 

In a circuit, the current lags behind the voltage by a phase difference of p /2, the circuit will contain which of the following : 
(a) only R
(b) only C
(c) R and C
(d) only L

Correct Answer – (D)

Question 10 : 

Turn ratio in a step up transformer is 1 : 2 if a Lechlanche cell of 1.5 V is connected across the input, then the voltage across the output will be
(a) 0.1 V
(b) 1.5 V 
(c) 0.75 V
(d) zero

Correct Answer – (D)
MCQ Questions Class 12 Alternating Current with Answers
Set 1
Set 2
Set 3
Set 4
Set 5

NCERT Solutions & Download NCERT Textbooks

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