8.4.1 Quark-lepton model and antiparticles Quiz: Pearson Edexcel Physics, Unit 8

The 20 questions

1. According to the Standard Model, what is a baryon composed of?

   • Quark and antiquark
   • Two quarks
   • Three leptons
   • Three quarks

2. According to the Standard Model, what is a meson composed of?

   • Three quarks
   • Three antiquarks
   • Quark and antiquark
   • Two leptons

3. Which of the following particles is a fundamental lepton?

   • The neutron
   • The pion
   • The proton
   • The electron

4. What is the quark composition of a neutron?

   • Up, up, up
   • Up, down, down
   • Down, down, down
   • Up, up, down

5. The quark-lepton model predicted the existence of a sixth quark. Which quark was this?

   • The bottom quark
   • The top quark
   • The charm quark
   • The strange quark

6. Which property of a particle and its antiparticle is identical?

   • Rest mass
   • Lepton number
   • Electric charge
   • Baryon number

7. A proton is made of two up quarks and one down quark. What is its electric charge?

   • -1
   • 0
   • +2/3
   • +1

8. A neutron is made from one up quark and two down quarks. What is its total electric charge?

   • Zero
   • +1
   • +2/3
   • -1

9. A positive pion is made from an up quark and an anti-down quark. What is its electric charge?

   • -1
   • 0
   • +1
   • +2/3

10. What is the quark composition of an antiproton?

    • Two anti-up, anti-down
    • Three anti-up
    • Anti-up, two anti-down
    • Three anti-down

11. Which of these particles has baryon number +1?

    • The electron
    • The proton
    • The positron
    • The pion

12. Which quantity has opposite signs for a particle and its antiparticle?

    • Spin
    • Electric charge
    • Rest mass
    • Half-life

13. What is the antiparticle of the electron?

    • Positron
    • Muon
    • Neutrino
    • Antielectron

14. Which quark transition occurs during beta-minus decay of a neutron?

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

15. What is the baryon number of a meson?

    • Zero
    • Two
    • One
    • Three

16. Which conservation law prevents an electron decaying into a single pion?

    • Lepton number
    • Electric charge
    • Baryon number
    • Strangeness

17. What is the lepton number of an antimuon?

    • -1
    • +2
    • 0
    • +1

18. Which property of the quark-lepton model predicted the top quark?

    • Mass spectrum
    • Decay rate
    • Symmetry
    • Charge spectrum

19. What is the electric charge of a down quark, in units of the elementary charge e?

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

20. What is the electric charge of an antiproton?

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

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