Class 12 Physics Chapter Alternating Current Free MCQ Test Quiz

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12th Physics: Alternating Current

1 / 10

1. An LCR series circuit, connected to a source E, is at resonance. Then the voltage across

R is zero

R equals applied voltage

C is zero

L equals applied voltage

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2 / 10

2. Alternating currents can be produced by a

dynamo

choke coil

transformer

electric motor

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3 / 10

3. Choose the correct option
Assertion : When the frequency of the AC source in an LCR circuit equals the resonant frequency, the reactance of the circuit is zero, and so there is no current through the inductor or the capacitor.
Reason : The net current in the inductor and capacitor is zero.

Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Assertion is correct, reason is incorrect

Assertion is incorrect, reason is correct

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4 / 10

4. Transformers are used

in DC circuit only

in AC circuits only

in both DC and AC circuits

neither in DC nor in AC circuits

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5 / 10

5. A transformer is employed to

convert A.C. into D.C.

convert D.C. into A.C.

obtain a suitable A.C. voltage

obtain a suitable D.C. voltage

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6 / 10

6. Of the following about capacitive reactance which is correct?

The reactance of the capacitor is directly proportional to its ability to store charge

Capacitive reactance is inversely proportional to the frequency of the current

Capacitive reactance is measured in farad

The reactance of a capacitor in an A.C. circuit is similar to the resistance of a capacitor in a D.C. circuit

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7 / 10

7. The alternating current can be measured with the help of

hot wire ammeter

hot wire voltmeter

moving magnet galvanometer

suspended coil type galvanometer

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8 / 10

8. The loss of energy in the form of heat in the iron core of a transformer is

iron loss

copper loss

mechanical loss

None of these

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9 / 10

9. If an LCR series circuit is connected to an ac source, then at resonance the voltage across

R is zero

R equals the applied voltage

C is zero

L equals the applied voltage

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10 / 10

10. A transformer is based on the principle of

mutual induction

self induction

Ampere’s law

X-ray crystallography

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Mohit Sinha

I’m Mohit Sinha! With a Master’s degree in Physics, I bring a deep understanding of the subject to my teaching. I specialize in guiding students through the complexities of Physics for 11th and 12th grades and also offer English instruction from 1st to 12th grade. When I'm not in the classroom, I'm passionate about creating engaging educational content for QuizRanker.org, where I help make learning both fun and effective.

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