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Show how you would connect… (Class 10 Science 2024, Q25A)

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ScienceCBSE Class 10 · Board exam 2024, set 31/1/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 25(A)

Set in the CBSE Class 10 board exam of 2024, paper 31/1/1, section B, question 25(A), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q25(A) · 2 marks · Very short answerElectricity

Show how you would connect three resistors each of resistance , so that the combination has a resistance of . Also justify your answer.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/1/1.

Hints

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

Hint 1

Three in series give 18 Ω and three in parallel give 2 Ω, so try a mixed arrangement.

Hint 2

What do two 6 Ω resistors in parallel give? Add one more in series.

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. Arrangement: connect two resistors in parallel and connect the third resistor in series with this parallel pair. Diagram: two 6 Ω resistors side by side between points A and B, then a third 6 Ω resistor from B to C.

    1 mark

  2. Justification: , so . Then .

    1 mark

Answer: Two 6 Ω in parallel (3 Ω) in series with the third 6 Ω gives 9 Ω

Where the marks are

  • Correct arrangement stated or drawn (1 mark)
  • Calculation showing and total (1 mark)

Revise the chapter

  • Chapter: Electricity (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Electricity, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/1/1: 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.