Lesson 3.2.1.5

3.2.1.5 Classification of particles Quiz: AQA Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.2.1.5, Classification of particles: 20 multiple choice questions for the AQA Physics (7408), Unit 2: Particles and radiation, written with Revision Ninja.

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The 20 questions

  1. What are the two classes of hadrons?

    • leptons and mesons
    • baryons and photons
    • baryons and mesons
    • quarks and leptons

  2. Which is the only stable baryon into which other baryons eventually decay?

    • pion
    • neutron
    • kaon
    • proton

  3. Which force does the pion mediate as its exchange particle?

    • strong nuclear force
    • gravitational force
    • weak nuclear force
    • electromagnetic force

  4. Which of these is NOT a lepton?

    • proton
    • electron
    • muon
    • electron neutrino

  5. What is the lepton number of an electron?

    • 0
    • -1
    • +2
    • +1

  6. What is the baryon number of an antiproton?

    • +2
    • 0
    • -1
    • +1

  7. What is the antiparticle of the muon?

    • antiproton
    • antineutrino
    • antimuon
    • positron

  8. What are the products of muon decay (mu- to electron plus neutrinos)?

    • an electron and a photon
    • a proton and an electron
    • an electron, an electron antineutrino and a muon neutrino
    • an electron and a neutron

  9. In muon decay mu- to e- + electron antineutrino + muon neutrino, what is the total muon lepton number of the products?

    • +2
    • -1
    • +1
    • 0

  10. What is the total baryon number of the products of neutron decay (n to p + e- + antineutrino)?

    • 2
    • -1
    • 0
    • 1

  11. A kaon decays into pions. Which interaction is responsible for this decay?

    • gravitational interaction
    • strong interaction
    • weak interaction
    • electromagnetic interaction

  12. Strange particles are produced through the strong interaction. In what way are they always created?

    • in groups of four
    • singly
    • in groups of three
    • in pairs

  13. Strangeness can change by 0, +1 or -1 in which type of interaction?

    • electromagnetic interaction
    • weak interaction
    • gravitational interaction
    • strong interaction

  14. What type of particle is the muon?

    • photon
    • meson
    • baryon
    • lepton

  15. What is the charge of a muon?

    • -1 e
    • +1 e
    • 0
    • -2 e

  16. What are the charge and baryon number of an antineutron?

    • -1 and -1
    • 0 and +1
    • 0 and -1
    • +1 and -1

  17. Is the reaction p + p to p + p + pi0 allowed, and why?

    • No, because lepton number is not conserved
    • No, because baryon number is not conserved
    • No, because charge is not conserved
    • Yes, because charge and baryon number are conserved

  18. Which decay violates the conservation of lepton number?

    • pi+ to mu+ + muon neutrino
    • mu- to e- + electron antineutrino + muon neutrino
    • n to p + e- + electron antineutrino
    • mu- to e- + photon

  19. What is the baryon number of a pion?

    • 1/3
    • -1
    • 1
    • 0

  20. Can a kaon decay into pions through the strong interaction?

    • Yes, because all quantum numbers are conserved
    • No, because charge is not conserved
    • Yes, because pions are hadrons
    • No, because strangeness changes so the decay must be weak

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