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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MCQ Questions Class 12 Alternating Current with Answers - Set - 4
Question 1:
Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication ?
(a) R = 20 W, L = 1.5 H, C = 35 mF
(b) R = 25 W, L = 2.5 H, C = 45 mF
(c) R = 15 W, L = 3.5 H, C = 30 mF
(d) R = 25 W, L = 1.5 H, C = 45 mF
Correct Answer – (A)
Question 2 :
In pure inductive circuit current
(a) lags behind emf by π/2
(b) leads the emf by π/2
(c) lags behind emf by π
(d) leads the emf by π
Correct Answer – (A)
Question 3 :
A rejector circuit is:
(a) series resonant circuit
(b) parallel resonant circuit
(c) LCR circuit
(d) None of these
Correct Answer – (B)
Question 4 :
The phase difference b/w the A.C. and e.m.f. π/2 Which of the following can not be the instituent of the circuit?
(a) LC
(b) L alone
(c) C alone
(d) RL
Correct Answer – (D)
Question 5 :
Which of the following effects is not shown in alternating current ?
(a) Chemical effect
(b) Magnetic effect
(c) Heating current
(d) All of these
Correct Answer – (A)
MCQ Questions Class 12 Alternating Current with Answers
Question 6 :
A circuit when connected to an AC source of 12 V gives a current of 0.2 A. The same circuit when connected to a DC source of 12 V, gives a current of
0.4 A. The circuit is
(a) series LR
(b) series RC
(c) series LC
(d) series LCR
Correct Answer – (A)
Question 7 :
The inductive reactance of an inductor coil of (1/π) H at 50 Hz is:
(a) 50/π Ω
(b) π/50 Ω
(c) 100 Ω
(d) 50 Ω
Correct Answer – (C)
Question 8 :
Faraday constant:
(a) depends on the amount of the electrolyte
(b) depends on the current in the electrolyte
(c) is a universal constant
(d) depends on the amount of charge passed through the electrolyte
Correct Answer – (C)
Question 9 :
An ac ammeter connected in series in an ac circuit reads 5A. The peak value of current:
(a) 5 A
(b) 5√2A
(c) √5A
(d) zero
Correct Answer – (B)
Question 10 :
Transformer works on the principle of:
(a) convertor
(b) invertor
(c) mutual induction
(d) self-induction
Correct Answer – (C)
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