Test your basic knowledge |

Subject : science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • 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. Arcs of increased mass concentration that slow stars and gas down as they orbit through which cause the formation of stars.






2. A star that is burning hydrogen to helium in a shell surrounding it's core






3. When a planet lines up with the sun inthe sky






4. Mercury and venus






5. 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.






6. The measure of a variable star's apparent magnitude as it brightens and dims with time






7. Saturn






8. The elementary building blocks from which protons and neutrons are formed.






9. The dimming of starlight by intervening dust






10. In an OPEN UNIVERSE - the curvature of space-time is ____ - Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is____.






11. A representation of the changes in color and brightness of an evolving protostar.






12. The location in an H-are diagram of a star cluster - where stars have just left the main sequence. Used to estimate the cluster age.






13. A bright area of higher temperature that often proceeds the formation of sunspots.






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






15. The point directly overhead.






16. The process similar to conduction by which energy moves from the solar core to the convective layer






17. Mercury and venus






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






19. Cold aggregates of gas - large and contain a huge amount of matter - so cold that molecules stick together to form molecules.






20. The nuclei of very distant galaxies. Likely a manifestation of supermassive black holes






21. Theory virtually demands that the geometry of the universe be ______. Results of measuring lumps in the cosmic background radiation indicate that the universe geometry is ________.






22. Form honeycomb like patterns surrounding empty or nearly empty voids.






23. First accurately measured the speed of light in a vacuum






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






25. The Big Bang says that the universe has not existed forever. It had a distinct beginning about 14 billion years ago called the 'Big Bang'. Therefore light from any object more than 14 billion light years away has not had time to reach us. The other p

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26. The location of a supermassive black hole






27. The fate of the universe if it is closed. The universe expanding as much as possible and then retracting






28. The equation that describes how matter equates with energy






29. Originially thought to be stars emitting radio radiation but are now concluded to be nuclei of distant galaxies (same as radio galaxies aka emit streams of material)






30. The source of the force that is accelerating the expansion rate of the universe.






31. A star fusing hydrogen to helium in it's core






32. Medium bulge - moderately would arms - arms have H2 regions in them and look sort of lumpy






33. The layer of the sun just above the photosphere






34. Sudden blasts of gamma radiation from a very distant galaxy caused possibly by a supernova explosion.






35. IO






36. The north-south line passing directly overhead through the zenith.






37. How did Earth come to have an oxygen rich atmosphere?






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






39. Ganymede






40. Light scattered through the atmosphere that degrades astronomical images






41. An empirical scheme for predictin ghe orbital distances of planets






42. The apparent path of the Sun through the stars on the celestial sphere.






43. A word meaning 'the same in all directions.'






44. The particle horizon is the farthest we can see. It exists because the universe had a beginning and thus a definite age. Light from distances farther away from the particle horizon have not had time to reach us yet.






45. 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)






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






47. Ganymede and Titan






48. A star that is burning hydrogen to helium in a shell surrounding it's core






49. When a planet lines up with the sun inthe sky






50. The instant of time after the Big Bang when space and time obtained their characteristics. (t=10^-43 sec when gravity freezes out-instant when gravity started existing as a separate force)