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Design an activity to show… (Class 10 Science 2025, Q28)

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ScienceCBSE Class 10 · Board exam 2025, set 31/4/1 · 3 marks · Short answer

CBSE Class 10 Science 2025: question 28

Set in the CBSE Class 10 board exam of 2025, paper 31/4/1, section C, question 28, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q28 · 3 marks · Short answerMetals and Non-metals

Design an activity to show that metals are good conductors of heat and have high melting points.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/4/1.

Hints

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

Hint 1

You need something at the far end of a metal wire that melts easily when it gets warm.

Hint 2

Think about what you would see at the far end, and what you would see at the heated part of the wire itself.

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. Set-up: Take an aluminium or copper wire and clamp it to a stand. Fix a pin to its free end using a little wax.

    1 mark

  2. Procedure and observation: Heat the wire with a spirit lamp or burner near the clamped end. After some time the wax melts and the pin falls off, but the wire itself does not melt.

    1 mark

  3. Conclusion: Heat travelled along the wire to the far end and melted the wax, so metals are good conductors of heat. The wire did not melt even in the flame, so metals have high melting points.

    1 mark

Answer: Heat a clamped metal wire with a pin fixed by wax at its far end. The pin falls off but the wire does not melt, so metals conduct heat well and have high melting points.

Where the marks are

  • Correct set-up of the activity: clamped wire with pin fixed by wax (1 mark)
  • Heating and observation that the pin falls while the wire does not melt (1 mark)
  • Conclusion about good heat conduction and high melting point (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Metals and Non-metals, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/4/1: 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.