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

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

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.

1.15 V

2.120 V

3.180

4.960 V

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

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

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

1.6 V

2.12 V

3.24 V

4.48 V

1.6 V

2.12 V

3.24 V

4.48 V

1.6 V

2.12 V

3.24 V

4.48 V

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

1.0.144 Ω

2.1.44

3.14.4 Ω

4.144 Ω

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

1. L/R

2.1RC

3.LC−−−√

4.RC

## More MCQS

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