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An ac source of voltage is… (Class 12 Physics 2023, Q13)

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PhysicsCBSE Class 12 · Board exam 2023, set 55/1/1 · 1 mark · MCQ

CBSE Class 12 Physics 2023: question 13

Set in the CBSE Class 12 board exam of 2023, paper 55/1/1, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · MCQSemiconductor Electronics: Materials, Devices and Simple Circuits

An ac source of voltage is connected in series with a p-n junction diode and a load resistor. The correct option for output voltage across load resistance will be :

  1. (A)Full sinusoidal wave (positive and negative half cycles)
  2. (B)Full-wave rectified output (continuous positive humps)
  3. (C)Half-wave rectified output (positive humps with gaps)
  4. (D)Constant dc level

Figure in the paper: Four V versus t waveforms (a)-(d) as described in the options. See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 55/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

When does a diode conduct?

Hint 2

With only one diode, only one half-cycle passes.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. A single diode conducts only in forward bias, that is, during one half-cycle of the ac input.

    ½ mark

  2. The output across the load is therefore a half-wave rectified wave (positive humps with gaps). This is option (C).

    ½ mark

Answer: Half-wave rectified output, option (C)

Where the marks are

  • Identifies half-wave rectification (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Semiconductor Electronics: Materials, Devices and Simple Circuits, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 55/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.