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B. I. Define… (Class 10 Science SQP 2026-27, Q34B)

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ScienceCBSE Class 10 · Sample paper, session 2026-27 · 2 marks · Very short answer

CBSE Class 10 Science sample paper 2026-27: question 34(B)

From the official CBSE sample question paper for 2026-27, section C, question 34(B), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q34(B) · 2 marks · Very short answerElectricity

B. I. Define resistivity. II. Justify with an example why resistivity is an intrinsic property of a material.

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

Start from how resistance depends on length and area of cross-section.

Hint 2

Think of two wires of the same metal but different sizes, and work out for each.

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. I. Resistance of a wire is . The resistivity of a material is the resistance of a wire of that material having unit length and unit area of cross-section. So , and its SI unit is .

    1 mark

  2. II. Resistivity depends only on the nature of the material (and its temperature), not on its length or thickness.

    Example: two copper wires of different lengths and thicknesses have different resistances. But when is calculated for each, both give the same value (about ). Hence resistivity is an intrinsic property of copper.

    1 mark

Answer: I. : the resistance of a wire of unit length and unit cross-sectional area; II. Copper wires of any size give the same , so it depends only on the material.

Where the marks are

  • Defines resistivity with (1 mark)
  • Justifies with an example, such as copper wires of different dimensions giving the same (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from 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.