Nuclear Physics MCQ • NEB/CEE Physics

☢️ Nuclear Physics

NEB / CEE Physics • Quick Revision

📘 Nucleus Discovery & Structure

Rutherford's α-scattering experiment discovered nucleus. Nucleus contains protons (Z) and neutrons (N). Mass number A = Z + N.

Nuclear density: ρ ≈ 2.3 × 10¹⁷ kg/m³ (constant, independent of A).

Atomic vs Nuclear Physics Difference Diagram

⚡ Mass-Energy & Binding Energy

Einstein's relation: E = mc². 1 amu = 931.5 MeV.

Mass defect (Δm): Δm = [Z mₚ + N mₙ] - M. Binding energy: B.E. = Δm × 931.5 MeV.

Packing fraction = (M - A)/A. B.E. per nucleon is maximum for Fe (≈8.8 MeV).

🧬 Isotopes & Atomic Mass

Isotopes: Same Z, different N. Atomic mass unit: 1/12th mass of ¹²C atom.

💥 Nuclear Reactions

Fission: Heavy nucleus splits (e.g., ²³⁵U + n → lighter nuclei + energy).

Fusion: Light nuclei combine (e.g., ²H + ³H → ⁴He + n + 17.6 MeV).

Annihilation: Particle + antiparticle → energy (photons). Pair production: γ → e⁻ + e⁺.

B.E. per nucleon curve explains stability. Fe is most stable. Fission for A>56, fusion for A<56 releases energy.

☢️ Nuclear Physics

NEB / CEE Physics • 50 MCQs

⏳ 10:00 📌 0/50 answered

🔄 Circular Motion MCQ

1. Nucleus was discovered by:

Thomson Rutherford Bohr Chadwick

2. Nuclear density is of the order of:

10³ kg/m³ 10¹⁷ kg/m³ 10²⁰ kg/m³ 10⁻¹⁷ kg/m³

3. Mass number A is equal to:

Z + N Z - N N - Z Z × N

4. Isotopes have same:

Mass number Atomic number Neutron number Atomic mass

5. Einstein's mass-energy relation is:

E = mc E = mc² E = m/c E = m²c

6. 1 amu is equivalent to:

931.5 eV 931.5 keV 931.5 MeV 931.5 GeV

7. Mass defect is defined as:

M - (Z mₚ + N mₙ) (Z mₚ + N mₙ) - M M - A A - M

8. Packing fraction is given by:

(M - A)/M (M - A)/A (A - M)/A M/A

9. Binding energy per nucleon is maximum for:

H Fe U He

10. In pair annihilation, particle and antiparticle produce:

Electron only Photons Protons Neutrons

🧪 Periodic Table MCQ

11. Nuclear fission was discovered by:

Rutherford Fermi Hahn & Strassmann Einstein

12. Fusion reaction takes place at:

Low temperature Very high temperature Room temperature Any temperature

13. Which particle has no rest mass?

Electron Proton Photon Neutron

14. The rest mass of electron is:

9.1 × 10⁻³¹ kg 1.67 × 10⁻²⁷ kg 1.6 × 10⁻¹⁹ kg 0 kg

15. In nuclear reactor, moderator is used to:

Stop reaction Slow down neutrons Speed up neutrons Absorb neutrons

16. Binding energy of deuteron (²H) is about:

2.2 MeV 8.8 MeV 28 MeV 200 MeV

17. Chain reaction is possible in:

Fusion Fission Both Neither

18. The particle emitted in β⁻ decay is:

Proton Electron Positron Alpha

19. Nuclear force is:

Long range Short range Infinite range Always repulsive

20. In pair production, energy is converted into:

Proton and neutron Electron and positron Two protons Two photons

⚛️ Atomic Structure MCQ

21. The energy released in fission of one ²³⁵U nucleus is about:

2 MeV 20 MeV 200 MeV 2000 MeV

22. Atomic mass unit (amu) is defined relative to:

¹H ¹²C ¹⁶O ⁴He

23. If packing fraction is negative, nucleus is:

Unstable Stable Radioactive Fissile

24. Which is a fusion reaction?

²³⁵U + n → Ba + Kr + 3n ²H + ³H → ⁴He + n ¹⁴C → ¹⁴N + e⁻ ²³⁸U → ²³⁴Th + α

25. The particle having same mass as electron but positive charge is:

Proton Positron Alpha Neutron

26. Nuclear density is independent of:

Mass number Volume Radius All of these

27. Radius of nucleus R is related to mass number A as:

R ∝ A R ∝ A²/³ R ∝ A¹/³ R ∝ A⁻¹/³

28. The minimum energy required to separate nucleons is:

Ionization energy Binding energy Kinetic energy Threshold energy

29. Which is NOT a nuclear reaction?

Fission Fusion Combustion Radioactive decay

30. The antiparticle of electron is:

Proton Positron Neutron Photon

31. 1 MeV is equal to:

1.6 × 10⁻¹⁹ J 1.6 × 10⁻¹³ J 1.6 × 10⁻¹⁶ J 1.6 × 10⁻¹⁰ J

32. For lighter nuclei (A<20), B.E. per nucleon:

Is constant Increases sharply Decreases Is zero

33. Control rods in nuclear reactor are made of:

Graphite Cadmium Water Sodium

34. The source of Sun's energy is:

Fission Fusion Chemical reaction Gravitational

35. Mass of nucleus is always ______ sum of masses of nucleons.

Greater than Less than Equal to Double

36. The energy equivalent of 1 kg mass is:

9 × 10¹⁶ J 3 × 10⁸ J 9 × 10⁸ J 3 × 10¹⁶ J

37. Which isotope is used in nuclear reactor?

²³⁴U ²³⁵U ²³⁸U ²³⁹U

38. Pair production requires minimum photon energy of:

0.511 MeV 1.022 MeV 2.044 MeV 931.5 MeV

39. Which force binds nucleons together?

Gravitational Electrostatic Nuclear force Magnetic

40. Annihilation produces:

One photon Two photons Three photons No photon

🪱 Earthworm MCQ

41. The mass of proton is approximately:

1.67 × 10⁻²⁷ kg 9.1 × 10⁻³¹ kg 1.6 × 10⁻¹⁹ kg 1 amu exactly

42. Critical mass is required for:

Fusion Chain reaction in fission Radioactive decay Pair production

43. Hydrogen bomb is based on:

Fission Fusion Both fission and fusion Chemical explosion

44. The binding energy of ⁴He is about:

2.2 MeV 7.1 MeV per nucleon 8.8 MeV per nucleon 28 MeV total

45. Which is NOT conserved in nuclear reaction?

Charge Mass number Mass Energy

46. The most stable nucleus is:

¹H ²H ⁵⁶Fe ²³⁵U

47. In β⁺ decay, which particle is emitted?

Electron Positron Alpha Gamma

48. Assertion (A): Energy is released in nuclear fusion.
Reason (R): B.E. per nucleon of product is higher than reactants.

Both A and R true, R explains A Both true, R not explanation A true, R false A false, R true

49. Packing fraction is zero for:

¹H ¹²C ¹⁶O ⁵⁶Fe

50. The process ⁴He + ⁴He → ⁸Be is:

Fission Fusion Decay Annihilation

🔬 Microbiology Notes

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Nuclear Physics MCQ • NEB/CEE Physics

☢️ Nuclear Physics

📘 Nucleus Discovery & Structure

⚡ Mass-Energy & Binding Energy

🧬 Isotopes & Atomic Mass

💥 Nuclear Reactions

☢️ Nuclear Physics

Published by CEE NEXUS Team

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📝 Welcome to CEE Nexus!

Nuclear Physics MCQ • NEB/CEE Physics

☢️ Nuclear Physics

📘 Nucleus Discovery & Structure

⚡ Mass-Energy & Binding Energy

🧬 Isotopes & Atomic Mass

💥 Nuclear Reactions

☢️ Nuclear Physics

Published by CEE NEXUS Team

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Search Notes

CEE Nexus MedAI

Student Doubt Forum 0 Doubts