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7. Alternating current — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics7. Alternating current1 Mark
MCQ
Given below are two statements:

Statement $I$: An $AC$ circuit undergoes electrical resonance if it contains either a capacitor or an inductor.

Statement $II$: An $AC$ circuit containing a pure capacitor or a pure inductor consumes high power due to its non-zero power factor.

In the light of above statements, choose the correct answer from the options given below

  • ✓
    Both Statement $I$ and Statement $II$ are false
  • B
    Statement $I$ is true but Statement $II$ is false
  • C
    Both Statement $I$ and Statement $II$ are true
  • D
    Statement I is false but Statement $II$ is true
✓

Answer

Correct option: A.
Both Statement $I$ and Statement $II$ are false
a
For resonance, $\phi=0$, hence both inductor and capacitor must be present. Also power factor is zero for pure inductor or pure capacitor hence both the component consume zero average power.

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