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Cosmic Microwave Background — MCQs

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1. What is the Cosmic Microwave Background (CMB)?





2. In which wavelength range is the CMB observed today?





3. What is the approximate temperature of the CMB today?





4. Who first accidentally discovered the CMB in 1965?





5. The CMB provides strong evidence for which theory?





6. The CMB was released when the universe was about how old?





7. What event caused the release of the CMB?





8. Before recombination, the universe was:





9. Which satellite provided the most detailed map of the CMB in 2013?





10. The slight variations in the CMB are called:





11. The uniformity of the CMB across the sky supports the idea of:





12. COBE, launched in 1989, confirmed the CMB had a:





13. What does the polarization of the CMB help scientists study?





14. Which anisotropies are due to our motion relative to the CMB?





15. The CMB anisotropies give information about:





16. The CMB was first theoretically predicted by:





17. Which constant is measured more accurately using the CMB?





18. The CMB temperature fluctuations are typically about:





19. The CMB supports the presence of which two unseen components of the universe?





20. The power spectrum of the CMB anisotropies provides information about:





21. The CMB is often referred to as the:





22. The nearly uniform CMB supports the idea that the universe is:





23. Which color would the CMB have appeared to early atoms at recombination?





24. The “cold spots” in the CMB correspond to:





25. The CMB is an example of:





26. What shape of universe does the CMB suggest?





27. The CMB helped determine the universe’s age to be about:





28. Which experiment first detected anisotropies in the CMB?





29. The Sachs-Wolfe effect relates CMB fluctuations to:





30. The CMB is often described as the:





31. The Sunyaev–Zel’dovich effect occurs when CMB photons interact with:





32. The CMB is essential for testing which cosmological model?





33. The CMB was much hotter in the past because:





34. Which kind of spectrum does the CMB follow?





35. The discovery of the CMB won the Nobel Prize in Physics in:





36. WMAP was launched in:





37. Planck spacecraft was launched by which agency?





38. Which type of information about the early universe is encoded in the CMB?





39. The Integrated Sachs-Wolfe effect provides evidence for:





40. What percentage of the universe is ordinary matter according to CMB data?





41. What percentage of the universe is dark matter according to CMB data?





42. What percentage of the universe is dark energy according to CMB data?





43. The uniformity of the CMB across the sky is called:





44. The CMB supports the need for:





45. The first space mission to detect CMB was:





46. Which process cooled photons into microwaves after the Big Bang?





47. The tiny irregularities in the CMB later grew into:





48. What does the angular power spectrum of the CMB show?





49. The study of the CMB helps confirm the universe’s geometry is:





50. The CMB is one of the most important tools for studying:





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