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7 free MDCAT Physics MCQs on Electronics (PM&DC syllabus), each with the answer, an explanation and the textbook line it comes from. Tap to check, no sign-up.

MDCAT (Pakistan)PhysicsPre-medical (Grade 12)7 questions

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  1. Question 1

    Using a capacitor to smooth the pulsating DC from a rectifier into a steadier output is called:

    Show answer and explanation

    Answer: D) Filtering

    The capacitor fills the gaps between peaks. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 112.

  2. Question 2

    A centre-tapped full-wave rectifier uses a centre-tapped transformer together with:

    Show answer and explanation

    Answer: C) Two diodes

    The bridge type uses four diodes instead. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 111.

  3. Question 3

    In a full-wave bridge rectifier, the current through the load resistor during the two half cycles flows:

    Show answer and explanation

    Answer: D) In the same direction

    So a rectified output appears across the load. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 111.

  4. Question 4

    In a bridge rectifier, during each half cycle of the input the current is conducted by:

    Show answer and explanation

    Answer: A) One pair of diodes

    The other pair is reverse biased. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 111.

  5. Question 5

    When the rectified voltage falls between peaks, the smoothing capacitor:

    Show answer and explanation

    Answer: B) Discharges slowly into the load

    This fills the gaps between peaks and reduces fluctuation. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 112.

  6. Question 6

    In a rectifier filter, a higher capacitance value provides:

    Show answer and explanation

    Answer: C) Better smoothing

    It may increase the charging current. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 112.

  7. Question 7

    Lowering the load resistance in a capacitor-filtered rectifier makes the capacitor:

    Show answer and explanation

    Answer: D) Discharge faster and smooth less

    The time constant RC becomes smaller. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 112.

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