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Planet Formation Theories — MCQs

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1. The nebular hypothesis of planet formation was first proposed by?





2. According to the nebular hypothesis, planets formed from?





3. Which theory suggests planets formed from the Sun’s material pulled out by another star?





4. The planetesimal hypothesis was developed by?





5. In the modern solar nebula model, planetesimals form by?





6. The process by which small bodies collide and grow into planets is called?





7. The core accretion model is most successful in explaining formation of?





8. The disk instability model suggests gas giants form by?





9. Which planet formation theory explains “hot Jupiters”?





10. Protoplanetary disks are mainly composed of?





11. The snow line in planet formation marks the distance where?





12. Which theory is no longer accepted due to lack of supporting evidence?





13. Which planets likely formed inside the snow line?





14. The angular momentum problem in early planet formation models refers to?





15. Differentiation in planets occurs when?





16. Which mechanism explains gaps in protoplanetary disks?





17. The Nice model explains?





18. Which event likely led to the Late Heavy Bombardment?





19. The capture theory suggested planets formed?





20. Which modern theory combines core accretion with migration?





21. Exoplanet discoveries strongly support which model?





22. Why do gas giants have massive atmospheres compared to terrestrial planets?





23. Which planet formation process explains asteroid belts?





24. Which planets are believed to have migrated significantly after formation?





25. In-situ formation of hot Jupiters is considered unlikely because?





26. The oligarchic growth stage of planet formation refers to?





27. Which theory explains Earth’s Moon formation?





28. Which evidence supports the giant impact hypothesis?





29. Why do terrestrial planets have thin atmospheres compared to gas giants?





30. Which model explains how gas giants quickly gain mass before disk dissipation?





31. Which planets likely underwent atmospheric loss due to solar wind stripping?





32. The Grand Tack hypothesis suggests Jupiter?





33. Which planet’s tilted axis may be due to giant impacts during formation?





34. Chondrules found in meteorites provide evidence for?





35. The primary challenge for disk instability model is?





36. The exoplanet population suggests?





37. Which observational evidence supports migration of planets?





38. Which factor determines whether a forming body becomes a planet or remains an asteroid?





39. Which exoplanet discovery method has revealed most planets so far?





40. Why are super-Earths common in exoplanet systems but absent in our solar system?





41. Which model explains Uranus and Neptune forming far from the Sun despite low material density?





42. The process of runaway growth in planet formation means?





43. The gas capture phase for giant planets begins when?





44. Why do many exoplanetary systems show resonant orbits?





45. Which evidence indicates that giant planet migration influenced small body populations?





46. What prevents gas giant formation very close to stars?





47. Which feature of Earth suggests violent impacts during formation?





48. Which mechanism explains irregular moons of giant planets?





49. Protoplanetary disks are usually observed around?





50. Which combination is currently favored in explaining planet formation?





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