Lesson 6.4.1

6.4.1 The nuclear atom Quiz: OCR Physics, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6.4.1, The nuclear atom: 20 multiple choice questions for the OCR Physics (H156), Unit 5: Particles and medical physics, written with Revision Ninja.

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The 20 questions

  1. What key evidence from alpha scattering shows that the atomic nucleus is extremely small?

    • Many small deflections
    • Few large deflections
    • No deflections seen
    • Uniform scattering

  2. At what nucleon separation does the strong nuclear force become repulsive?

    • Below 0.5 fm
    • Above 3 fm
    • At 1.5 fm
    • Above 10 fm

  3. What is the approximate maximum range of the attractive strong nuclear force?

    • 3 nm
    • 3 fm
    • 0.5 fm
    • 3 pm

  4. Nuclear radius R is proportional to which power of the nucleon number A?

    • A^(1/3)
    • A^3
    • A^(1/2)
    • A^(2/3)

  5. Which fundamental force acts on hadrons but never on leptons?

    • Strong nuclear force
    • Weak nuclear force
    • Electromagnetic force
    • Gravitational force

  6. What is the quark composition of a proton?

    • uus
    • uud
    • udd
    • dds

  7. What is the quark composition of a neutron?

    • uss
    • udd
    • dds
    • uud

  8. What is the electric charge of an up quark in terms of e?

    • -1/3 e
    • +2/3 e
    • +1/3 e
    • -2/3 e

  9. What is the electric charge of a down quark in terms of e?

    • -1/3 e
    • +1/3 e
    • -2/3 e
    • +2/3 e

  10. In beta-minus decay, which quark transformation takes place inside the nucleus?

    • Strange to up
    • Up to down
    • Down to strange
    • Down to up

  11. In beta-plus decay, which quark transformation takes place inside the nucleus?

    • Up to strange
    • Down to up
    • Up to down
    • Strange to down

  12. Which of the following particles is classified as a lepton?

    • Pion
    • Proton
    • Neutrino
    • Neutron

  13. Which of the following particles is classified as a hadron?

    • Proton
    • Neutrino
    • Electron
    • Muon

  14. How does the mean density of a nucleus change as nucleon number increases?

    • It doubles with A
    • It decreases rapidly
    • It remains constant
    • It increases linearly

  15. What observation in alpha scattering proved that the atomic nucleus is positively charged?

    • Alpha particle deflection
    • Neutron scattering
    • Alpha particle absorption
    • Electron emission

  16. What is the typical order of magnitude ratio of atomic diameter to nuclear diameter?

    • 10^2
    • 10^5
    • 10^8
    • 10^12

  17. Which physical property of a positron is identical to that of an electron?

    • Lepton number
    • Baryon number
    • Mass
    • Charge

  18. What neutral particle is emitted alongside an electron during beta-minus decay?

    • Positron
    • Electron neutrino
    • Electron antineutrino
    • Up quark

  19. Nuclei of isotopes of the same element have different numbers of which particle?

    • Electrons
    • Protons
    • Quarks
    • Neutrons

  20. In the standard nuclear notation A Z X, what does the letter A represent?

    • Proton number
    • Nucleon number
    • Neutron number
    • Electron number

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