Class 12 Physics Chapter Alternating Current Free MCQ Test Quiz for 2026 exam

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12th Physics: Alternating Current

1 / 10

1. If the frequency of an A.C. is made 4 times of its initial value, the inductive reactance will

be 4 times

be 2 times

be half

remain the same

2 / 10

2. A capacitor acts as an infinite resistance for

DC

AC

DC as well as AC

neither AC nor DC

3 / 10

3. With increase in frequency of an A.C. supply, the impedance of an L-C-R series circuit

remains constant

increases

decreases

decreases at first, becomes minimum and then increases.

4 / 10

4. Quantity that remains unchanged in a transformer is

voltage

current

frequency

None of these

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

6 / 10

6. The graph between inductive reactance and frequency is

parabola

straight line

hyperbola

an arc of a circle

7 / 10

7. An inductor, a resistor and a capacitor are joined in series with an AC source. As the frequency of the source is slightly increased from a very low value, the reactance of the

inductor increases

resistor increases

capacitor increases

circuit increases

8 / 10

8. The transformer voltage induced in the secondary coil of a transformer is mainly due to

a varying electric field

a varying magnetic field

the vibrations of the primary coil

the iron core of the transformer

9 / 10

9. 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

10 / 10

10. The capacitive reactance in an A.C. circuit is

effective resistance due to capacity

effective wattage

effective voltage

None of these

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