Protoplanetary Disks — MCQs

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1. What is a protoplanetary disk?





2. Protoplanetary disks are the birthplace of:





3. Which substance dominates the gas in a protoplanetary disk?





4. What is the primary source of dust in protoplanetary disks?





5. Which type of planets usually form closer to the star?





6. Which type of planets form beyond the snow line?





7. What is the “snow line” in a protoplanetary disk?





8. Which telescope is most famous for studying protoplanetary disks in detail?





9. Which wavelength is best for detecting protoplanetary disks?





10. The inner disk region is generally:





11. The typical lifetime of a protoplanetary disk is:





12. What causes gaps in a protoplanetary disk?





13. What is a transition disk?





14. Dust grains in disks combine to form:





15. The main force driving disk rotation is:





16. Gas dispersal in disks is mainly caused by:





17. Which of the following is NOT found in protoplanetary disks?





18. The habitable zone in a protoplanetary disk depends on:





19. Which planets migrate more easily through disks?





20. Planetary migration occurs because of:





21. The chemistry of disks can reveal:





22. Which molecules are commonly detected in protoplanetary disks?





23. The outer disk regions are typically:





24. Which instrument on ALMA helps detect protoplanetary disks?





25. Debris disks differ from protoplanetary disks because:





26. Protoplanetary disks are often observed around:





27. Which feature indicates planet formation in disks?





28. Dust settles toward the disk midplane due to:





29. The main role of turbulence in disks is:





30. What do spiral arms in protoplanetary disks usually indicate?





31. Which type of disk structure can indicate giant planet presence?





32. Which factor influences disk lifetime?





33. Protoplanetary disks may eventually evolve into:





34. Which element is most abundant in disk dust?





35. What role does radiation pressure play in disks?





36. Jets seen in young star systems are linked to:





37. The midplane of the disk is:





38. Which part of the disk is most observable in infrared?





39. Protoplanetary disk thickness decreases with:





40. Which observation technique maps gas motion in disks?





41. What is the main barrier to dust growth in disks?





42. Which feature helps determine disk orientation?





43. Which factor helps icy grains stick together?





44. The first stage of planet formation in disks is:





45. ALMA images often show:





46. Planetary embryos form from:





47. Which type of protoplanetary disk is more massive?





48. Gas accretion onto giant planets creates:





49. Dust traps in disks prevent:





50. Protoplanetary disks provide clues to:





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