CIE iGCSE Co-Ordinated Science P6.2.2 Life cycle of stars Exam Style Questions Paper 1
▶️ Answer/Explanation
The life cycle of a star depends on its mass:
- Small mass star (about the same mass as the Sun): red giant → white dwarf + planetary nebula
- Large mass star: red supergiant → supernova → neutron star
- Very large mass star: red supergiant → supernova → black hole
Therefore, for a large mass star, the final stage is a neutron star. A supernova is an event that occurs before the final stage (the explosion that leaves behind a neutron star or black hole). A planetary nebula is the final stage for a small mass star (like the Sun), and a black hole is the final stage for a very large mass star.
✅ Answer: (C)
▶️ Answer/Explanation
Gravitational force is the universal force of attraction between objects with mass. It keeps planets in orbit around the Sun by providing the centripetal force needed for circular motion. Additionally, gravitational attraction between particles in interstellar clouds causes them to collapse and form protostars. Therefore, both phenomena are caused by gravitational force.
✅ Answer: (B)
✅ Answer: (B)