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The binding energy per… (Class 12 Physics SQP 2026-27, Q7)

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

CBSE Class 12 Physics sample paper 2026-27: question 7

From the official CBSE sample question paper for 2026-27, section A, question 7, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q7 · 1 mark · MCQNuclei

The binding energy per nucleon curve shows a maximum around mass number A=56. What does this imply about nuclei near iron (Fe)?

  1. (A)They are the least stable nuclei.
  2. (B)They are the most tightly bound nuclei.
  3. (C)They undergo spontaneous fission releasing maximum energy.
  4. (D)They cannot participate in nuclear reactions.

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

What does a larger binding energy per nucleon mean for stability?

Hint 2

Fission is typical of very heavy nuclei, not iron.

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. Binding energy per nucleon measures how strongly each nucleon is held in the nucleus.

    ½ mark

  2. Its maximum near means these nuclei are the most tightly bound and most stable. Option (B).

    ½ mark

Answer: They are the most tightly bound nuclei, option (B)

Where the marks are

  • Links maximum binding energy per nucleon to the greatest stability (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Nuclei, 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.