Q126 / 180 · AIIMS 2009 · Physics

Assertion: Transformers are used only in alternating current source not in direct current. Reason : Only a.c. can be stepped up or down by means of transformers.

  • Correct answer
    A
    If both assertion and reason are true and reason is the correct explanation of assertion
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion
  • C
    If assertion is true but reason is false
  • D
    If both assertion and reason are false.

Solution

Transformers which convert low voltages into higher ones are called step-up transformers, while those which convert high voltages into lower ones are called step-down transformers. This is possible only for a.c. source and not for d.c. source.

Hence, the correct answer is option: 'A'.

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