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

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12th Physics: Alternating Current

1 / 10

1. A capacitor acts as an infinite resistance for

DC

AC

DC as well as AC

neither AC nor DC

2 / 10

2. 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

3 / 10

3. When an ac voltage of 220 V is applied to the capacitor C, then

the maximum voltage between plates is 220 V.

the current is in phase with the applied voltage.

the charge on the plate is not in phase with the applied votage.

power delivered to the capacitor per cycle is zero

4 / 10

4. Power factor of the A. C. circuit varies between

0 to 0.5

0.5 to 1

0 to 1

1 to 2

5 / 10

5. 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

6 / 10

6. 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

7 / 10

7. 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

8 / 10

8. In series combination of R, L and C with an A.C. source at resonance, if R = 20 ohm, then impedence Z of the combination is

20 ohm

zero

10 ohm

400 ohm

9 / 10

9. A transformer is based on the principle of

mutual induction

self induction

Ampere’s law

X-ray crystallography

10 / 10

10. The frequency of A.C. mains in India is

30 c/s

50 c/s

60 c/s

120 c/s

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