X-ray Astronomy — MCQs

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1. X-ray astronomy studies which type of radiation?





2. The wavelength range of X-rays is approximately:





3. Earth’s atmosphere blocks X-rays, so observations must be made from:





4. The Sun emits X-rays mostly from its:





5. Which was the first X-ray source discovered outside the solar system?





6. The first detection of cosmic X-rays occurred in:





7. The first orbiting X-ray observatory was:





8. The Uhuru satellite was launched in:





9. Which X-ray satellite was launched by NASA in 1999?





10. The European Space Agency’s large X-ray telescope is:





11. Which X-ray source is believed to be a black hole candidate?





12. X-ray astronomy is useful for studying:





13. Which type of stars are strong X-ray emitters?





14. X-rays are produced when matter falls onto:





15. Which famous supernova remnant is a bright X-ray source?





16. Which NASA mission studied gamma rays and X-rays together?





17. The Einstein Observatory (HEAO-2) was launched in:





18. Which telescope is called the “flagship X-ray observatory” of NASA?





19. The main mirrors of X-ray telescopes use:





20. Which satellite was launched jointly by Germany, the UK, and the US in 1990?





21. ROSAT stands for:





22. Which compact object often produces X-ray pulsations?





23. X-ray binaries consist of a normal star and a:





24. Which discovery linked X-ray sources with black holes?





25. X-ray bursts are often caused by:





26. The Sun’s X-ray radiation varies with:





27. Which X-ray satellite made the first all-sky survey?





28. What are clusters of galaxies bright in X-rays mainly because of?





29. Which X-ray telescope has the highest angular resolution?





30. Which element’s K-shell emission line is often seen in X-rays?





31. Which technique is commonly used in X-ray spectroscopy?





32. The first cosmic X-ray source was discovered using:





33. The Chandra X-ray Observatory was named after:





34. Which galaxy’s central black hole emits strong X-rays?





35. Sagittarius A* is observed in X-rays as:





36. Which type of telescope cannot focus X-rays directly?





37. Which mission studied X-ray background radiation?





38. The discovery of pulsars in X-rays confirmed the existence of:





39. The XMM-Newton telescope was launched in:





40. The Swift satellite is mainly designed to study:





41. X-ray binaries are classified into:





42. Which technique allows focusing of X-rays?





43. The energy of X-rays is typically measured in:





44. Which stellar objects often show X-ray variability?





45. Which was the first satellite dedicated to X-ray astronomy?





46. The Chandra telescope has an angular resolution of about:





47. The hot corona of the Sun is best studied in:





48. Which X-ray mission detected evidence of dark matter in galaxy clusters?





49. X-rays from black holes are generated when:





50. Which upcoming mission will continue high-energy X-ray astronomy?





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