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ISC Class 12 Electromagnetic Induction & Alternating Current — practice questions — page 2

Explore 58 free Electromagnetic Induction & Alternating Current questions in ISC Class 12 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electromagnetic Induction & Alternating Current questions and exercises with answers

Showing questions 31–58 of 58.

An inductor in an ac circuit offers:Read the answer and worked solution →A capacitor in an ac circuit offers:Read the answer and worked solution →The total opposition of an ac circuit is called its:Read the answer and worked solution →Alternating voltages are stepped up or down by means of:Read the answer and worked solution →The rms current equals the dc current that would produce the same:Read the answer and worked solution →At resonance in a series LCR circuit, the impedance is:Read the answer and worked solution →At resonance the current amplitude in the circuit is:Read the answer and worked solution →Besides an inductor, resonance needs the circuit to contain a:Read the answer and worked solution →The quantity cos of the phase angle is called the:Read the answer and worked solution →A current that dissipates no power is referred to as:Read the answer and worked solution →Maximum power is dissipated in a series LCR circuit at:Read the answer and worked solution →Inductive reactance is directly proportional to the:Read the answer and worked solution →A radio is tuned to a station by matching the resonant frequency of:Read the answer and worked solution →Resonance is described as a phenomenon that is:Read the answer and worked solution →The impedance of a series LCR circuit at resonance equals:Read the answer and worked solution →A lagging wattless current is neutralised by adding an equal:Read the answer and worked solution →Order the induction chainRead the answer and worked solution →Name the induction quantityRead the answer and worked solution →Match the induction termRead the answer and worked solution →Match the ac circuit termRead the answer and worked solution →True or false about ac circuitsRead the answer and worked solution →Inductor or capacitor?Read the answer and worked solution →The SI unit of inductance is the:Read the answer and worked solution →The emf Blv produced by a moving conductor is called:Read the answer and worked solution →The SI unit of reactance is the:Read the answer and worked solution →At the resonant frequency, the two reactances are:Read the answer and worked solution →Lenz's law fixes which feature of the induced emf?Read the answer and worked solution →NEET · Physics · AC — RMS vs PeakRead the answer and worked solution →

Worked practice questions

An inductor in an ac circuit offers:

  1. Negative resistance
  2. Resonant frequencies
  3. Inductive reactance
  4. Capacitive reactance
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Correct answer: C. Inductive reactance

1. An inductor opposes changes in current. 2. That opposition acts like a resistance in an ac circuit. 3. It is called inductive reactance. 4. So the answer is inductive reactance. _Source: syllabus Physics, Ch 7 'Alternating Current'_

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A capacitor in an ac circuit offers:

  1. Inductive reactance
  2. Resonant impedance
  3. Wattless resistance
  4. Capacitive reactance
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Correct answer: D. Capacitive reactance

1. The quantity one over omega C acts like a resistance. 2. It belongs to the capacitor, not the inductor. 3. It is called capacitive reactance. 4. So the answer is capacitive reactance. _Source: syllabus Physics, Ch 7 'Alternating Current'_

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The total opposition of an ac circuit is called its:

  1. Wattage
  2. Impedance
  3. Frequency
  4. Amplitude
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Correct answer: B. Impedance

1. Resistance alone does not describe an ac circuit. 2. Reactances must be combined with it. 3. The combined quantity is the impedance Z. 4. So the answer is impedance. _Source: syllabus Physics, Ch 7 'Alternating Current'_

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