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Free download in PDF Class 12 Physics Chapter 7 Alternating Current Induction Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(1)
Transformer works on the principle of:
[A]
convertor
[B]
invertor
[C]
mutual induction
[D]
self-induction
(2)
In series resonant circuit:
[A]
reactance is zero
[B]
current is zero
[C]
voltage is zero
[D]
None of these
(3)
An acceptor circuit is :
[A]
series resonant circuit
[B]
parallel resonant circuit
[C]
LCR circuit
[D]
None of these
Answer: series resonant circuit
(4)
Energy dissipates in LCR circuit in :
[A]
L only
[B]
C only
[C]
R only
[D]
All of the above°
(5)
A broadcast circute broadcasts at 300 m band. A condenser of capacitance 2.4 lµF is available. The value of the inductance required for resonant circuit is:
[A]
10-4 H
[B]
10-8 H
[C]
10-6 H
[D]
10-2 H
(6)
An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the
[A]
15 V
[B]
120 V
[C]
180 V
[D]
960 V
(7)
The dimensional formula of L/R is similar to that of:
[A]
frequency
[B]
time
[C]
length
[D]
none of these
(8)
The dimensional formula of impedance is;
[A]
[ML2T-2A-2]
[B]
[ML2T-3A-2]
[C]
[ML2T-2A-1]
[D]
[ML2T-2A-3]
(9)
Power factor of an ac circuit is a measure of:
[A]
virtual power
[B]
power lost in the circuit
[C]
mean power
[D]
all the above
Answer: power lost in the circuit
(10)
Which of the following has dimensions different from the rest?
[A]
L/R
[B]
1/RC
[C]
√LC
[D]
RC
(11)
What is the ratio of inductive and capacitance reactances in an ac circuit?
[A]
1
[B]
ω²L
[C]
ω²LC
[D]
l
(12)
In parallel resonant circuit:
[A]
impedance is very high
[B]
current is very high
[C]
voltage is very high
[D]
None of these
Answer: impedance is very high
(13)
An ac ammeter connected in series in an ac circuit reads 5A. The peak value of current:
[A]
5 A
[B]
5√2A
[C]
5/√5 A
[D]
zero
(14)
Which of the following effects is not shown in alternating current ?
[A]
Chemical effect
[B]
Magnetic effect
[C]
Heating current
[D]
All of these
(15)
An electric circuit containing capacitor only suffers:
[A]
equal resistance for A.C. and D.C.
[B]
Resistance of A.C. > Resistance of D.C.
[C]
Resistance for A.C. < Resistance of D.C.
[D]
offers infinite resistance for D.C.
Answer: offers infinite resistance for D.C.
(16)
The average power dissipation in pure inductance or capacitance is:
[C]
either (a) or (b)
[D]
zero
(17)
The band width of a series resonant circuit is :
[A]
f0/Q0
[B]
R/2πL
[C]
R/4πL
[D]
4R
(18)
The natural frequency of an L -C-Circuit is equal to :
(19)
In series LCR circuit, the phase angle between supply voltage and current is
(20)
Which of the following graphs represents the correct variation of inductive reactance XL with frequency u?
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