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CUET UG Electromagnetic Induction & Alternating Current — practice questions — page 2

Explore 78 free Electromagnetic Induction & Alternating Current questions in CUET UG 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 31–60 of 78.

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 →At the resonant frequency, the two reactances are: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 →Whose experiments led to modern generators and transformers?Read the answer and worked solution →Moving a magnet towards a coil induces in the coil an:Read the answer and worked solution →The SI unit of magnetic flux is the:Read the answer and worked solution →Inductance depends only on the coil's geometry and its:Read the answer and worked solution →The induced current opposes the change that produced it, because:Read the answer and worked solution →Because the induced current opposes the motion, the mover must:Read the answer and worked solution →The constant linking flux linkage to current is called:Read the answer and worked solution →The constant M linking two neighbouring coils is called:Read the answer and worked solution →The constant L for a single coil is called its:Read the answer and worked solution →Mutual inductance is also called the coefficient of:Read the answer and worked solution →An alternative name for the SI unit of magnetic flux is:Read the answer and worked solution →If the induced current did not oppose the change, one could get:Read the answer and worked solution →A galvanometer connected to a coil shows deflection only when:Read the answer and worked solution →Flux through a coil can be changed without moving it, by changing:Read the answer and worked solution →The negative sign in Faraday's law expresses which law?Read the answer and worked solution →Induced emf depends on the time rate of change of:Read the answer and worked solution →The effective value of an alternating current is called its:Read the answer and worked solution →The household line voltage of 220 V is which kind of value?Read the answer and worked solution →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 →

Worked practice questions

The quantity cos of the phase angle is called the:

  1. Phase factor
  2. Peak factor
  3. Loss factor
  4. Power factor
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Correct answer: D. Power factor

1. Average power in an ac circuit is not simply V times I. 2. A factor involving the phase angle multiplies it. 3. That factor is called the power factor. 4. So the answer is power factor. _Source: syllabus Physics, Ch 7 'Alternating Current'_

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A current that dissipates no power is referred to as:

  1. Wattless current
  2. Resonant current
  3. Effective current
  4. Alternating one
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Correct answer: A. Wattless current

1. A purely reactive component is ninety degrees out of phase. 2. It carries charge but delivers no average power. 3. It is referred to as wattless current. 4. So the answer is wattless current. _Source: syllabus Physics, Ch 7 'Alternating Current'_

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Maximum power is dissipated in a series LCR circuit at:

  1. Low current
  2. Resonance
  3. Zero volts
  4. High phase
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Correct answer: B. Resonance

1. Power dissipation follows the current through R. 2. The current peaks when impedance is least. 3. That happens at resonance. 4. So the answer is resonance. _Source: syllabus Physics, Ch 7 'Alternating Current'_

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