E.5 Fusion and stars Quiz
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5 questions, one answer each
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1. Which effect balances gravity in a stable star?
- A. Radiation pressure
- B. The strong force
- C. Magnetic force
- D. Centripetal force
2. A star has a parallax angle of 0.050 arc-second. Its distance is:
- A. 0.050 pc
- B. 5.0 pc
- C. 20 pc
- D. 50 pc
3. A star is hot but has a very low luminosity. It is most likely:
- A. A red giant
- B. A white dwarf
- C. A red supergiant
- D. A main-sequence star like the Sun
4. Two stars have the same surface temperature, but star A is 100 times more luminous than star B. The ratio R_A / R_B is:
- A. 100
- B. 10
- C. √10
- D. 10 000
5. The remnant core of a star has a mass of 2.0 M☉ (below the Oppenheimer–Volkoff limit). It becomes:
- A. A white dwarf
- B. A neutron star
- C. A red giant
- D. A planetary nebula