NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 7 Alternating Current Sample Test,Sample questions

Question:
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:

1.10-4 H

2.10-8 H

3.10-6 H

4.10-2 H


Question:
A rejector circuit is:

1.series resonant circuit

2.parallel resonant circuit

3.LCR circuit

4.None of the above


Question:
An ac ammeter connected in series in an ac circuit reads 5A. The peak value of current:

1. 5 A (b) (c)

2.5√2A

3.5√5 A

4.Zero


Question:
An acceptor circuit is :

1. series resonant circuit

2.parallel resonant circuit

3.LCR circuit

4.None of these


Question:
An electric circuit containing capacitor only suffers:

1.equal resistance for A.C. and D.C. (b)

2. Resistance of A.C. > Resistance of D.C.

3.Resistance for A.C. < Resistance of D.C.

4.offers infinite resistance for D.C.


Question:
An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the

1.15 V

2.120 V

3.180

4.960 V


Question:
Energy dissipates in LCR circuit in :

1.L only

2.C only

3.R only

4.All the above


Question:
Faraday constant:

1.depends on the amount of the electrolyte

2.depends on the current in the electrolyte

3.is a universal constant

4. depends on the amount of charge passed through the electrolyte


Question:
In pure inductive circuit current

1.lags behind emf by π/2

2. leads the emf by π/2

3.lags behind emf by π

4. leads the emf by π


Question:
In series resonant circuit:

1.reactance is zero

2.current is zero

3.voltage is zero

4.None of the above


Question:
In series resonant circuit:

1.reactance is zero

2.current is zero

3.voltage is zero

4.None of the above


Question:
In series resonant circuit:

1.reactance is zero

2.current is zero

3.voltage is zero

4.None of the above


Question:
In the above problem, the value of the resistance of the coil Y is:

1.0.58 Ω

2. 5.8 Ω

3.1.16

4. 11.6 Ω


Question:
Power factor of an ac circuit is a measure of:

1.virtual power

2.power lost in the circuit

3.mean power

4.All the above


Question:
The average power dissipation in pure inductance or capacitance is:
(a) 12 LI²

1.12 LI²

2.3/2 CV²

3.either (a) or (b)

4.zero


Question:
The current through an inductor of 1H is given by I = 3t sin t. The voltage across the inductor of 1 H is:

1.3 sin t + 3 cos t

2.3 sin t + 3t cos t

3.3 cos t + t sin t

4.3t cos t + sin t


Question:
The dimensional formula of impedance is;

1.[ML2T-2A-2]

2.ML2T-3A-2]

3.[ML2T-2A-1]

4. [ML2T-2A-3]


Question:
The dimensional formula of L/R is similar to that of:

1.requency

2.time

3.length

4.None of the above


Question:
The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

1.6 V

2.12 V

3.24 V

4.48 V


Question:
The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

1.6 V

2.12 V

3.24 V

4.48 V


Question:
The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

1.6 V

2.12 V

3.24 V

4.48 V


Question:
The phase difference b/w the A.C. and e.m.f. π2 Which of the following can not be the instituent of the circuit?

1.LC

2.L alone

3.C alone

4.RL


Question:
Transformer works on the principle of:

1.convertor

2.invertor

3.mutual induction

4.self-induction


Question:
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:

1.0.144 Ω

2.1.44

3.14.4 Ω

4.144 Ω


Question:
What is the ratio of inductive and capacitance reactances in an ac circuit?

1. 1

2.ω²L

3.ω²LC

4.l


Question:
Which of the following effects is not shown in alternating current ?

1.Chemical effect

2.Magnetic effect

3.Heating current

4.All the above


Question:
Which of the following has dimensions different from the rest?

1. L/R

2.1RC

3.LC−−−√

4.RC


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