Stellar Nucleosynthesis — MCQs

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1. What is stellar nucleosynthesis?





2. Which element is primarily produced during the main sequence phase of a star?





3. What is the primary fuel for stars like the Sun?





4. The triple-alpha process converts helium into:





5. Which element is considered the end point of stellar fusion in massive stars?





6. In which type of star does the CNO cycle dominate hydrogen fusion?





7. The proton-proton chain is dominant in:





8. The CNO cycle requires which element as a catalyst?





9. What type of reaction occurs in stellar cores?





10. Which process is responsible for elements heavier than iron?





11. The r-process occurs mainly during:





12. The s-process stands for:





13. Which element is the “ash” of hydrogen burning in the Sun?





14. Carbon fusion in massive stars produces:





15. Silicon fusion produces:





16. What halts further fusion at iron in stars?





17. Which element is the heaviest produced by normal stellar fusion before a supernova?





18. Elements heavier than iron are primarily produced by:





19. The proton-proton chain converts hydrogen nuclei into:





20. What provides the high temperature needed for fusion in stellar cores?





21. The triple-alpha process requires:





22. What is the binding energy per nucleon of iron compared to lighter elements?





23. The term “metallicity” in astronomy refers to:





24. Which stars are considered the main producers of carbon and nitrogen in galaxies?





25. Oxygen is mainly produced in stars through:





26. Which process explains the abundance of helium in the universe?





27. Heavy elements like gold and uranium are mostly formed in:





28. Hydrogen shell burning occurs when:





29. Which stellar phase is dominated by helium burning?





30. Stars more massive than the Sun can fuse elements up to:





31. Which isotope is the main product of stellar helium fusion?





32. What happens after a massive star exhausts its nuclear fuel?





33. Which elements are known as “alpha elements”?





34. Neon burning in stars produces:





35. Which phase occurs just before a massive star undergoes supernova?





36. Which nuclear process dominates in low-mass stars?





37. What fraction of a star’s mass is typically hydrogen at birth?





38. Which of these elements is mainly produced in red giant stars?





39. Which is the most abundant element in the universe?





40. What is the main energy source of stars on the main sequence?





41. Which element marks the transition from exothermic to endothermic fusion?





42. Which reaction produces neutrinos in stars?





43. What causes supernova nucleosynthesis?





44. Which isotopes are produced by the s-process in asymptotic giant branch stars?





45. Which fusion process requires temperatures above 100 million K?





46. Which element acts as a “bottleneck” in stellar fusion due to its high binding energy?





47. Supernova shockwaves contribute to:





48. Which type of stars contribute most to galactic enrichment of helium and carbon?





49. Which fusion stage occurs only in stars more massive than 8 solar masses?





50. What is the ultimate fate of nucleosynthesis products in stars?





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