Fundamental Particles (OCR A Level Physics): Exam Questions

Exam code: H556

5 mins5 questions
1
1 mark

Which column A, B, C or D, shows the correct sequence for the evolution of the Universe between the Big Bang and the formation of stars?

A

B

C

D

Universe starts to expand

↓

quarks and leptons form

↓

hadrons form

↓

nuclei form

↓

atoms form

Universe starts to expand

↓

hadrons form

↓

quarks and leptons form

↓

nuclei form

↓

atoms form

quarks and leptons form

↓

nuclei form

↓

Universe starts to expand

↓

atoms form

↓

hadrons form

quarks and leptons form

↓

hadrons form

↓

Universe starts to expand

↓

nuclei form

↓

atoms form

    1
    1 mark

    The table below shows the quark compositions of four particles A, B, C and D.

    A

    B

    C

    D

    u u d

    u d d

    u d s

    s s s

    Which particle has a positive charge?

      2
      1 mark

      Which statement is correct?

      • Hadrons are made up of protons and neutrons.

      • A positron and a proton are examples of leptons.

      • The positron and the electron have the same mass.

      • The weak nuclear force is responsible for alpha-decay.

      3
      1 mark

      Which lepton is emitted in the decay of an up quark and is affected by a magnetic field?

      • neutrino

      • electron

      • positron

      • antineutrino

      4
      1 mark

      A nucleus decays by beta-minus (β−) decay.

      Which equation correctly describes the change in the quark structure of a nucleon during this decay?

      • d → u + e−10 + ν¯e

      • d → u + e+10 + νe

      • u → d + e−10 + ν¯e

      • u → d + e+10 + νe