plumiThe quark-lepton model and antiparticles: Edexcel International A Level Physics questions
Edexcel International A Level Physics past-paper questions on 4.5.2.3 The quark-lepton model and antiparticles, 2019–2025, with mark schemes and examiner’s reports where available.
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Q14(a)(i)
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All 34 questions on The quark-lepton model and antiparticles, as a list
- June 2025, Unit 4, Q14(a)(i) (1 mark): State the quark structure of a meson. (1)
- January 2025, Unit 4, Q2 (1 mark): The standard quark‑lepton model includes particles called mesons. Which of the following is a meson? A photon B pion C positron D proton
- January 2025, Unit 4, Q4 (1 mark): The positron is the antiparticle of the electron. Which row of the table gives a similarity and a difference between a positron and an electron? Similarity Diff
- October 2024, Unit 4, Q3 (1 mark): Which row of the table shows a fundamental particle and a non-fundamental particle? Fundamental Non-fundamental A alpha neutron B lepton meson C proton electron
- October 2024, Unit 4, Q18(b)(i) (1 mark): The Σ + particle is made of two up quarks and one strange quark. State what type of particle Σ + is. (1)
- June 2024, Unit 4, Q11(b) (2 marks): A book about the Chadwick experiment includes the following statement: “Chadwick’s experiment established that the neutron was a new fundamental particle and no
- June 2024, Unit 4, Q14(a) (2 marks): State the quark structure of baryons and of mesons. (2) Baryon Meson
- June 2024, Unit 4, Q14(b)(i) (5 marks): One type of leptoquark has charge +5e/3 Determine the baryon number and the lepton number for this leptoquark. Include the suggested quark and lepton in your wo
- January 2024, Unit 4, Q22(a)(i) (2 marks): The following table lists some quarks and their charge. Quark Charge / e + 2 Up (u) 3 − 1 Down (d) 3 − 1 Strange (s) 3 Explain the quark structure of a K – meso
- October 2023, Unit 4, Q21(a) (1 mark): Give a possible quark structure of a pion. (1)
- June 2023, Unit 4, Q6 (1 mark): Which of the following is a fundamental particle? A neutrino B neutron C pion D proton
- June 2023, Unit 4, Q11 (5 marks): In 2022, CERN announced the discovery of a new particle known as a pentaquark which is made of five quarks. The table shows the charges on some quarks. Quark Ch
- January 2023, Unit 4, Q1 (1 mark): The table shows the charges on up quarks and down quarks. Quark Charge / e + 2 u 3 – 1 d 3 Which row of the table shows the quark structure of protons and neutr
- January 2023, Unit 4, Q11(a) (1 mark): State one difference between a positron and an electron. (1)
- January 2023, Unit 4, Q18(a)(i) (3 marks): Explain why the existence of a sixth quark was predicted. (3)
- January 2023, Unit 4, Q18(a)(ii) (1 mark): A short time after formation, most quarks combine to make particles known as hadrons. There are two categories of hadron. Name the two categories of hadron. (1)
- October 2022, Unit 4, Q1 (1 mark): Which row of the table describes the mass and charge of an anti-proton? Mass / kg Charge / C A −27 −19 1.67 × 10 1.6 × 10 B −27 −19 1.67 × 10 −1.6 × 10 C −27 −1
- October 2022, Unit 4, Q7 (1 mark): The table shows the relative charges on up and down quarks. 2 u 3 e − 1 3 e d Which of the following could be the quark composition for a baryon with a charge o
- October 2022, Unit 4, Q11(a) (1 mark): Pions belong to a group of particles known as mesons. State the quark structure of mesons. (1)
- October 2022, Unit 4, Q11(b) (1 mark): Muons belong to a family of particles known as leptons. State one property of leptons. (1)
- June 2022, Unit 4, Q1 (1 mark): Which of the following is a fundamental particle? A pion B proton C neutrino D neutron
- June 2022, Unit 4, Q14(c) (2 marks): The table shows the charge for the up quark and the down quark as a fraction of the charge on the proton. Quark Charge u +2/3 d –1/3 Deduce the quark structure
- June 2022, Unit 5, Q13(b) (2 marks): Occasionally 40K decays by emitting a β+ particle. Give two similarities between a β– particle and a β+ particle. (2)
- January 2022, Unit 4, Q2 (1 mark): Which row in the table gives the charge and mass of an antiproton? Charge / C Mass / kg A 1.6 × 10−19 −9.11 × 10−31 B −1.6 × 10−19 9.11 × 10−31 C 1.6 × 10−19 −1
- January 2022, Unit 4, Q16(b)(i) (2 marks): Describe the structure of a baryon and a meson. (2)
- January 2022, Unit 4, Q17(a) (2 marks): The muon belongs to the same family of particles as the electron. State how the muon is classified in the standard model. (2)
- October 2021, Unit 4, Q1 (1 mark): Which of the following is a fundamental particle? A atom B baryon C neutrino D pion
- October 2021, Unit 4, Q9 (1 mark): Which of the following is the quark structure for a π– particle? A d d d B u u d C u d D u d
- June 2021, Unit 4, Q1 (1 mark): Which of the following is a fundamental particle? A antiproton B muon C neutron D pion
- June 2021, Unit 4, Q4 (1 mark): In 2015, a pentaquark was discovered. The pentaquark was made of 5 quarks, c, c–, d, u, u. The pentaquark can form a baryon-meson combination. Which row of the
- June 2021, Unit 4, Q18(a) (3 marks): State the properties of a positron that show it is the antiparticle to the electron. (3)
- January 2021, Unit 4, Q14(b) (2 marks): After muons were discovered in 1936 they were known for many years as mu mesons. Explain why muons are not described as mesons in the standard model. (2)
- October 2020, Unit 4, Q13 (4 marks): In 1964 George Zweig proposed a model for matter. Zweig suggested that mesons and baryons are made from a set of fundamental particles he called aces. In this m
- January 2020, Unit 4, Q12 (6 marks): The following passage is taken from an article about the history of particle physics. Mystery Particle By 1932 scientists knew of the existence of the subatomic
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