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The life cycle of stars

10th grade (Year 11 in England) · 11 questions · Common Core: NGSS.HS-ESS1-1, NGSS.HS-ESS1-3 · England: KS3 Physics: Space physics, KS4 Physics: Space physics (separate science)

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1
Question 1
In the life cycle of a star like the Sun, what comes straight after "main sequence star"?
- A. white dwarf
- B. protostar
- C. nebula (cloud of dust and gas)
- D. red giant
2
Question 2
What process releases energy in the core of a star?
- A. nuclear fusion of hydrogen into helium
- B. chemical reactions with oxygen
- C. nuclear fission of uranium
- D. burning coal
3
Question 3
In the life cycle of a star much more massive than the Sun, what comes straight after "nebula"?
- A. red supergiant
- B. supernova
- C. protostar
- D. main sequence star
4
Question 4
What process releases energy in the core of a star?
- A. nuclear fusion of hydrogen into helium
- B. chemical reactions with oxygen
- C. burning coal
- D. nuclear fission of uranium
5
Question 5
In the life cycle of a star like the Sun, what comes straight after "red giant"?
- A. nebula (cloud of dust and gas)
- B. protostar
- C. white dwarf
- D. main sequence star
6
Question 6
Why is a main sequence star stable for billions of years?
- A. It stops fusion
- B. It has no gravity
- C. Gravity pulling in is balanced by pressure from fusion pushing out
- D. It is cold inside
7
Question 7
In the life cycle of a star like the Sun, what comes straight after "nebula (cloud of dust and gas)"?
- A. red giant
- B. protostar
- C. white dwarf
- D. main sequence star
8
Question 8
Why is a main sequence star stable for billions of years?
- A. It stops fusion
- B. It is cold inside
- C. It has no gravity
- D. Gravity pulling in is balanced by pressure from fusion pushing out
9
Question 9
In the life cycle of a star much more massive than the Sun, what comes straight after "supernova"?
- A. red supergiant
- B. protostar
- C. main sequence star
- D. neutron star or black hole
10
Question 10
Where were elements heavier than iron made?
- A. in the Earth's oceans
- B. by plants
- C. in supernova explosions and neutron-star collisions
- D. in ordinary fires
11
Question 11
In the life cycle of a star like the Sun, what comes straight after "red giant"?
- A. nebula (cloud of dust and gas)
- B. main sequence star
- C. white dwarf
- D. protostar

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Answer key: The life cycle of stars

1. D. red giant
2. A. nuclear fusion of hydrogen into helium
3. C. protostar
4. A. nuclear fusion of hydrogen into helium
5. C. white dwarf
6. C. Gravity pulling in is balanced by pressure from fusion pushing out
7. B. protostar
8. D. Gravity pulling in is balanced by pressure from fusion pushing out
9. D. neutron star or black hole
10. C. in supernova explosions and neutron-star collisions
11. C. white dwarf