Hertzsprung-Russell diagram and stellar life cycles Quiz
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5 questions, one answer each
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1. Which star would be found at the upper right of the HR diagram?
- A. A hot, small star
- B. A cool, dim star
- C. A hot, dim star
- D. A cool, very luminous star
2. What stops a main-sequence star from collapsing under gravity?
- A. The magnetic field of the star
- B. Its rotation alone
- C. Outward pressure from the energy released by fusion
- D. The ejection of the outer layers
3. Which sequence correctly describes the life cycle of the Sun?
- A. Protostar, main sequence, red giant, planetary nebula, white dwarf
- B. Protostar, main sequence, red supergiant, supernova, neutron star
- C. Main sequence, protostar, red giant, white dwarf, nebula
- D. Protostar, red giant, main sequence, white dwarf, supernova
4. A star has a higher surface temperature than the Sun but a much lower luminosity. Where does it lie on the HR diagram?
- A. Upper right
- B. Bottom left
- C. Upper left
- D. Bottom right
5. Why do stars of much greater mass have shorter main-sequence lifetimes?
- A. They have less hydrogen
- B. They are cooler
- C. They are further away
- D. They fuse hydrogen much faster