Test your basic knowledge |

Subject : science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Matter that reveals itself only through its gravitational attraction.






2. Radiation (possibly left over from the big bang) that fills the universe. Perfect black body spectrum and tells us a bit aout how galaxies are formed.






3. The temp at which a substance in the vacuum of space solidifies






4. A phenomenon seen when the Earth passes through the orbit of a burned out comet






5. Poitns of gravitational stability in the orbit of a planet






6. 1. We see rapid movements or high energy radiation coming at some level from the nuclei of nearly every galaxy we have looked at. 2. We suspect that the creation of these supermassive black holes is part of the galaxy formation process.






7. Wave- only waves cause an interference pattern when passing through a double slit - particle- only particles deposit energy at specific locations (the way an image builds up on digital camera)






8. A toroidal or donut-shaped collection of material attracted to a central body like a star or black hole. Dust around an object






9. The shadow area behind the Earth or Moon where the Sun is completely obscured.






10. Stars orvits do not define the spiral patterns - instead they are density waves that move at slower speeds (arms are defined by young O and B stars and gas clouds)






11. The dimming of starlight by intervening dust






12. A cloud of ionized hydrogen. Formed when young stars heat the surrounding gas






13. A nearby galaxy with a quasar-like nucleus. closer but less bright than quasars-weaker






14. A collection of galaxies like the one the Milky Way belongs to






15. The point directly overhead.






16. Jupiter






17. Flat disk with gas - dust - H2 regions - molecular clouds - dust young stars and remnants of old planetary nebula and supernova remnants. stars spin together with similar velocities called differential rotation






18. As open clusters age - they push gas away but dust remains this can reflect light giving the cluster a blue-ish color. also called reflection nebula






19. Light-flaky crust - convective currents cause it to wrinkle and bunch (1/5 of surface). uniform cratering suggests lack of weathering and tectonics. volcanoes are flat due to atmospheric pressure.






20. Large bulge - tightly wound spiral arms - relatively few h2 regions and are smooth






21. Jupiter






22. Clouds of low density gas often found glowing faintly on either side of an AGN.






23. Ganymede and Titan






24. Infinitely long -> 10 cm






25. A telescope that uses lenses to focus light






26. A push or a pull






27. Norhern lowlands- darker in color and have far fewer craters as if an ancient sea or ice field covered them. southern highlands- much higher in density of craters.






28. A planet that is farther from the sun than the Earth is






29. A prominence seen against the disk of the sun






30. A high-pressure bulge in Neptune's southern hemisphere






31. The location around an atom where an electron resides.






32. Rich= dense crowded cores of galaxies - poor= few members and a looser organization of galaxies






33. That which is responsible for Jupiter's magnetic field






34. We can infer the absolute magnitude of pulsating variable stars by measuring their pulsation periods. The longer the pulsations - the greater their luminosities. We then again measure their apparent magnitudes - compare it with their absolute magnitu






35. A repeated - periodic push or pull capable of summing into a larger push or pull






36. The relation that tells how light dims with distance.






37. When particles are compressed to an unnatural state where their pressure is not related to their temperature






38. After stars form they pump light energy into surrounding gas causing it to heat up and glow (H2=ionized hydrogen - H1= neutral hydrogen in molcular couds)






39. The lowest energy of an atom.






40. The rotation period of the Earth measured relative to the Sun.






41. A continuous spectrum of light missing energy at a few wave lengths.






42. When the Moon entirely blocks the Sun.






43. The high- temperatature outer layer of the sun






44. The science of measuring the apparent magnitudes of stars by imaging them through different filters.






45. Galaxies whose nuclei emit jets of materil at high speeds. material comes from supermassive black holes






46. The surface of the sun






47. The crust of a meteorite caused by its entry into Earth's atmosphere






48. Flattened spherical distribution of old stars with some young stars too. 'hub' of Milky way - stars orbit with solid body speeds. Elongated into bar shape






49. The process that powers the sun and hydrogen bombs






50. Radiation given off by electrons accelerating in a magnetic field