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. In a FLAT UNIVERSE(our universe) - the curvature of space-time is ________. Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is _____.






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






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






4. Is there water on the moon?






5. The Greek philosopher responsible for making the stellar magnitude scale.






6. Why do Galaxies move very rapidly in the interiors of the dense clusters?






7. The time when the universe cooled sufficiently for atoms to exist. radiation dominated= first 300000 years - THEN era of recombination turns into matter dominated for next.






8. A measure of the seasonal shifting of a star's position against farther stars or galaxies. The closer the star - the greater is the angular distance it shifts. We use it to find distances to stars that are up to 1000 pc away.






9. IO






10. Hurricane-like vortex in southern-hemisphere winds to north and south blow in opposite directions which keep it spinning and with no subsurface features like mountians it persists.






11. Possible Fates of the Universe






12. Moon in less than the angular diameter of the Sun.






13. The Greek philosopher responsible for making the stellar magnitude scale.






14. The surface of the sun






15. The era when the ratio of matter to energy greatly favored matter. (verses radiation dominated universe where it was opaque. Matter is now dominated by gravity not photons)






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






17. A faint - remarkably uniform distribution of radiation in space






18. The number of protons in an atom.






19. The normal eastward movement of a planet against the background of hte distant stars.






20. What do we think the actual fate of the universe will be and why do we think this?






21. The gap etween saturn's A and B rings






22. A star without enough mass to begin hydrogen fusion






23. Venus






24. A spinning neutron star






25. 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.






26. Star speed at outer edge of galaxy should begin to diminish - but they dont so we guess that this means there is increasing force (aka dark matter)






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






28. Jupiter






29. Dying small mass stars lose their outer layers in a relatively gentle way - creating a round or bipolar nebula about the star (round like planets)






30. Half of the longest diameter across an ellipse






31. How is the Hubble Law consistent with an expanding universe?






32. In Ptolemy's geocentric solar system - the small circle on which a planet moved.






33. The faint glow of light left over from the Big Bang. cosmic microwave background are the photons that remain after the big bang that have not turned into matter.






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






35. Why does the earth have few craters while the moon has many?






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






37. Any class of objects with a uniform luminosity used to determine distance.






38. Light-colored high-pressure bands in Jupiter's atmosphere






39. If stars have diff orbital periods - than any arms formed by stars will wind into a tight spiral pattern (billion yrs or so)






40. Titan






41. 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)






42. The telescope configuration that has the focus placed at the back of the primary mirror






43. 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.






44. 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.






45. The law stating that hotter blackbodies look bluer than cooler blackbodies.

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46. Disk dust grains are made of all the elements that are not in gaseous form in space which blocks starlight and causes interstellar extinction






47. Arcs of increased mass concentration that slow stars and gas down as they orbit through which cause the formation of stars.






48. A quantity measuring the stability of the Earth's atmosphere






49. A telescope that uses lenses to focus light






50. Where is the center of the expansion