Molecular Clouds — MCQs

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1. What are molecular clouds primarily composed of?





2. Which molecules are commonly used to trace molecular clouds?





3. Molecular clouds are also known as:





4. Which of the following is the largest molecular cloud in our galaxy?





5. The typical temperature of molecular clouds is:





6. Which region of the electromagnetic spectrum is best for observing molecular clouds?





7. Why are molecular clouds important in astronomy?





8. Which molecular cloud is closest to Earth?





9. What prevents molecular clouds from collapsing under their own gravity?





10. Dense regions within molecular clouds where stars form are called:





11. The Orion Nebula is part of which molecular cloud complex?





12. What is the approximate density of molecular hydrogen in molecular clouds?





13. Which molecule, besides H₂, is the most abundant in molecular clouds?





14. Molecular clouds appear dark in visible light because:





15. Which telescope is especially useful for studying molecular clouds?





16. Which molecules in molecular clouds can indicate star-forming activity?





17. Giant Molecular Clouds (GMCs) typically have masses up to:





18. The collapse of molecular clouds leads to the formation of:





19. What role do dust grains play in molecular clouds?





20. Molecular hydrogen (H₂) is difficult to detect directly because:





21. Star formation efficiency in molecular clouds is usually:





22. What are Bok globules?





23. Which process helps trigger molecular cloud collapse?





24. Which molecule is often called the “workhorse” tracer of molecular clouds?





25. Which of the following is NOT usually found in molecular clouds?





26. Which nebula is an example of a star-forming molecular cloud region?





27. How are molecular clouds related to spiral arms in galaxies?





28. What is the lifetime of a typical giant molecular cloud?





29. Molecular clouds are detected using:





30. Which element dominates molecular clouds?





31. The dark lanes in the Milky Way visible from Earth are caused by:





32. What is the Jeans criterion used for?





33. Which region in the sky is rich in giant molecular clouds?





34. Why do stars form in molecular clouds instead of atomic clouds?





35. What fraction of a galaxy’s interstellar medium is in the form of molecular clouds?





36. Which isotope of CO is often used to trace cloud mass more accurately?





37. Which energy process heats molecular clouds?





38. What happens to molecular clouds after massive star formation?





39. Which large structure contains multiple giant molecular clouds?





40. What is the typical size of a giant molecular cloud?





41. Why is CO a better tracer of molecular clouds than H₂?





42. Which organic molecules have been detected in molecular clouds?





43. Molecular clouds are critical to galactic evolution because:





44. Which of the following best describes the internal structure of molecular clouds?





45. What observational signature indicates star formation inside a molecular cloud?





46. Which molecules in molecular clouds are considered “coolants” that help collapse?





47. Which factor primarily determines whether a molecular cloud will collapse?





48. Which feedback effect from massive stars can disrupt molecular clouds?





49. Which type of star clusters often form inside giant molecular clouds?





50. Why do astronomers study molecular clouds?





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