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If nucleus scaled to… (Class 12 Physics SQP 2026-27, Q11)

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

CBSE Class 12 Physics sample paper 2026-27: question 11

From the official CBSE sample question paper for 2026-27, section A, question 11, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q11 · 1 mark · MCQAtoms

If nucleus scaled to football size is approximately 22cm, then the radius of the orbit of electron will be approximately:

  1. (A)22 cm
  2. (B)22 m
  3. (C)22 km
  4. (D)22000 km

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 typical sizes of an atom and a nucleus.

Hint 2

Multiply 22 cm by that ratio.

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. The size of an atom is about m and the size of a nucleus is about m, so their ratio is about .

    ½ mark

  2. Scaled up, the orbit radius is m km. Option (C).

    ½ mark

Answer: 22 km, option (C)

Where the marks are

  • Uses the atom-to-nucleus size ratio of about to get 22 km (1 mark)

Revise the chapter

  • Chapter: Atoms (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Atoms, 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.