Complete module assessment with 15 multiple choice questions and 5 written-response questions grounded in this module's lesson content.
Q1. The Big Bang model describes the universe as having expanded from:
Q2. The cosmic microwave background is evidence for:
Q3. Hubble's Law states that galaxy recession speed is proportional to:
Q4. A star's long-term evolution is controlled mainly by its:
Q5. Elements heavier than iron are mainly formed in:
Q6. The Hertzsprung-Russell diagram plots stars by luminosity and:
Q7. A star's spectral class is linked most directly to its:
Q8. A neutron star is supported largely by:
Q9. Rutherford's gold foil experiment showed that atoms have:
Q10. Bohr explained hydrogen emission lines using:
Q11. Quantum mechanics replaces precise electron orbits with:
Q12. The strong nuclear force is needed because it:
Q13. Half-life is the time for:
Q14. When a particle meets its antiparticle, they may:
Q15. In the Standard Model, protons and neutrons are made of:
Q16. Explain how redshift, Hubble's Law and the cosmic microwave background support the Big Bang model.
Q17. Describe how stars form elements and how the HR diagram helps classify stellar evolution.
Q18. Compare Rutherford, Bohr and quantum mechanical models of the atom.
Q19. Explain the role of the strong nuclear force, half-life and antiparticles in nuclear physics.
Q20. Describe how the Standard Model and particle accelerators help investigate matter.
Q1: B
Q2: C
Q3: D
Q4: A
Q5: B
Q6: D
Q7: C
Q8: A
Q9: B
Q10: D
Q11: C
Q12: A
Q13: D
Q14: B
Q15: C
Redshift of distant galaxies shows that space is expanding, because wavelengths are stretched as galaxies recede. Hubble's Law links recession speed to distance, supporting a uniformly expanding universe. The cosmic microwave background is relic radiation from a hot dense early universe, now cooled by expansion to microwave wavelengths. Together these observations support the Big Bang model.
Marks: 1, redshift | 1, expansion | 1, Hubble relationship | 1, CMB relic radiation | 1, combined support
Stars fuse lighter nuclei into heavier nuclei, releasing energy and forming elements up to iron in stellar cores. Elements heavier than iron require extreme events such as supernovae or neutron-star mergers. The Hertzsprung-Russell diagram plots luminosity against temperature or spectral class. It shows groups such as main sequence stars, giants and white dwarfs, helping infer stellar size, stage and evolution.
Marks: 1, fusion | 1, up to iron | 1, heavier element origin | 1, HR axes | 1, evolutionary classification
Rutherford's model placed most mass and positive charge in a small dense nucleus with mostly empty space around it. Bohr kept the nucleus but introduced quantised electron energy levels to explain hydrogen line spectra. The quantum mechanical model replaces fixed circular orbits with orbitals, probability distributions and wavefunctions. Each model explained evidence that earlier models could not, but also had limits.
Marks: 1, Rutherford nucleus | 1, empty space | 1, Bohr quantised levels | 1, spectra | 1, quantum orbitals/probability
The strong nuclear force binds protons and neutrons in the nucleus and overcomes electrostatic repulsion between protons at very short range. Radioactive decay is random for individual nuclei, but a large sample has a predictable half-life, the time for half the undecayed nuclei or activity to remain. Antiparticles have the same mass as corresponding particles but opposite charge or quantum numbers. Particle-antiparticle annihilation converts mass-energy into photons or other particles.
Marks: 1, strong force binds nucleons | 1, overcomes proton repulsion | 1, half-life meaning | 1, random/statistical decay | 1, antiparticle/annihilation
The Standard Model describes matter particles such as quarks and leptons and force carriers such as photons, gluons and weak bosons. Protons and neutrons are made of quarks. Particle accelerators use electric fields to increase particle energy and magnetic fields to steer or focus beams. Collisions produce new particles, and detectors infer their properties from tracks, curvature, energy deposits and decay products.
Marks: 1, Standard Model particles | 1, protons/neutrons made of quarks | 1, accelerator electric fields | 1, magnetic steering | 1, detector evidence
I have completed this module assessment and reviewed the answers.