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JEE Advanced Alternating Current — practice questions

Explore 5 free Alternating Current questions in JEE Advanced Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Alternating Current questions and exercises with answers

Showing questions 1–5 of 5.

If the secondary coil has more turns than the primary, the transformer is:Read the answer and worked solution →What is the approximate peak voltage of a 220 V household supply?Read the answer and worked solution →Judge the assertion and the reasonRead the answer and worked solution →Type the ac numbersRead the answer and worked solution →Step up or step downRead the answer and worked solution →

Worked practice questions

If the secondary coil has more turns than the primary, the transformer is:

  1. Step-off
  2. Step-in
  3. Step-up
  4. Step-out
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Correct answer: C. Step-up

1. The turns ratio decides which way the voltage moves. 2. More turns on the secondary means a higher secondary voltage. 3. If the secondary has a greater number of turns, the voltage is stepped up. 4. That arrangement is called a step-up transformer. _Source: syllabus Physics Part I, Ch 7 'Alternating Current'_

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What is the approximate peak voltage of a 220 V household supply?

  1. 311 volts
  2. 211 volts
  3. 411 volts
  4. 511 volts
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Correct answer: A. 311 volts

1. The peak is the rms value multiplied by root two. 2. Root two is about 1.414. 3. That gives 1.414 times 220 volts. 4. The peak voltage is about 311 V. _Source: syllabus Physics Part I, Ch 7 'Alternating Current'_

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Judge the assertion and the reason

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Questions
  1. Reason
    The power factor there is zero, so no power is dissipated even though a current flows.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A purely reactive ac circuit dissipates no power.
  2. Reason
    A well designed transformer can be more than ninety-five per cent efficient.
    Verdict
    Both are true; the reason does not explain the assertion.
    Assertion
    Mains voltage is quoted as 220 volts.
  3. Reason
    Alternating current travels along a wire faster than direct current.
    Verdict
    The assertion is true and the reason is false.
    Assertion
    Alternating voltage is preferred for power distribution.
  4. Reason
    In a capacitor the current leads the voltage by a quarter cycle.
    Verdict
    The assertion is false and the reason is true.
    Assertion
    In an inductor the current leads the voltage.
Instructions
Read both statements, then pick the verdict that fits.
_Source: syllabus Physics Part I, Ch 7 'Alternating Current'_

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