Optical Astronomy — MCQs

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1. Which type of telescope uses lenses to gather and focus light?





2. Who is credited with building the first practical refracting telescope?





3. Which type of telescope uses mirrors instead of lenses?





4. Who invented the reflecting telescope?





5. The largest optical telescopes in the world today use:





6. The distortion of starlight due to Earth’s atmosphere is called:





7. The main advantage of a reflecting telescope over a refracting telescope is:





8. What is the primary purpose of an optical telescope?





9. Chromatic aberration occurs in which type of telescope?





10. The resolving power of a telescope depends on its:





11. The world’s largest single-aperture optical telescope is located in:





12. The Hubble Space Telescope operates mainly in which spectrum?





13. Adaptive optics in telescopes is used to:





14. A spectroscope attached to a telescope is used to study:





15. What is the unit of angular measurement commonly used in astronomy?





16. The faintest objects visible in optical astronomy are measured by:





17. The Keck Observatory uses:





18. Which planet was first observed with a telescope?





19. The rings of Saturn were first observed by:





20. What do astronomers call the “twinkling” of stars?





21. An eyepiece in a telescope is mainly used for:





22. Which color of light has the shortest wavelength visible to human eyes?





23. Atmospheric windows refer to:





24. Which observatory is located in Hawaii?





25. The diffraction limit of a telescope is inversely proportional to:





26. The first telescope launched into space was:





27. The primary mirror of a telescope is usually shaped as:





28. Optical interferometry helps in:





29. Which country operates the Very Large Telescope (VLT)?





30. Which star did Galileo observe with his telescope?





31. Why are many optical observatories built on high mountains?





32. What is the main function of a telescope mount?





33. Light-gathering power of a telescope is proportional to:





34. The largest refracting telescope in the world is at:





35. The twinkling of planets is less noticeable than stars because:





36. A Newtonian telescope uses:





37. In astronomy, “seeing” refers to:





38. The largest optical telescope mirror in the world is about:





39. A Cassegrain telescope design uses:





40. The first object Galileo pointed his telescope to was:





41. The Sun viewed through a telescope must use:





42. Which optical effect spreads white light into a spectrum?





43. The Palomar Observatory houses a telescope of:





44. The Giant Magellan Telescope will use:





45. Which of the following cannot be studied with optical telescopes?





46. The eye of a telescope is known as:





47. The first star other than the Sun to have its spectrum studied was:





48. The main reason for putting telescopes in space is to:





49. Optical telescopes detect which type of radiation?





50. The James Webb Space Telescope also observes in:





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