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A bridge circuit is… (Class 12 Physics SQP 2026-27, Q9)

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PhysicsCBSE Class 12 · Sample paper, session 2026-27 · 1 mark · MCQ

CBSE Class 12 Physics sample paper 2026-27: question 9

From the official CBSE sample question paper for 2026-27, section A, question 9, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q9 · 1 mark · MCQCurrent Electricity

A bridge circuit is shown in the following figure. The total current flowing in the circuit is-

  1. (A)18 A
  2. (B)5 A
  3. (C)5/18 A
  4. (D)18/5 A

Figure in the paper: Bridge between points X and Y: 2 Ω from X to top junction, 4 Ω from top junction to Y, 3 Ω from X to bottom junction, 6 Ω from bottom junction to Y, 5 Ω connecting top and bottom junctions. A 18 V battery is connected between X and Y through the bottom junction path (battery connected across X and Y). See it in the official paper.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

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

Hint 1

Compare the ratios of the resistances in the two arms.

Hint 2

In a balanced bridge the middle resistor can be removed.

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. Check the bridge: , so the bridge is balanced and the 5 Ω resistor carries no current.

    ½ mark

  2. The arms Ω and Ω are in parallel: Ω. Then A. Option (B).

    ½ mark

Answer: 5 A, option (B)

Where the marks are

  • Recognises the balanced bridge, finds Ω and A (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Current Electricity, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2026-27: 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.