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Electrical wires made… (Class 10 Science SQP 2026-27, Q23)

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ScienceCBSE Class 10 · Sample paper, session 2026-27 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2026-27: question 23

From the official CBSE sample question paper for 2026-27, section B, question 23, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q23 · 1 mark · MCQMetals and Non-metals

Electrical wires made of aluminum

  1. (A)corrode easily as aluminium is a very reactive metal.
  2. (B)corrode easily because porous flaky aluminium oxide is formed.
  3. (C)do not corrode easily as aluminium oxide forms a protective layer.
  4. (D)do not corrode easily as aluminium is less reactive than metals like sodium, magnesium and zinc.

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

Think about what forms on the surface of aluminium in air.

Hint 2

Is this oxide layer flaky like rust, or does it protect the metal?

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. Aluminium is reactive, but on exposure to air it forms a thin, tough layer of .

    ½ mark

  2. This oxide layer is non-porous and protects the metal underneath from further corrosion. Answer: (C).

    ½ mark

Answer: Option (C)

Where the marks are

  • States that a protective oxide layer prevents further corrosion; chooses (C) (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 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.