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. Distance from sun to nucleus- 8 kiloparsecs (26000 LY) - diameter of Milky way- 150000 LY - length for sun to orbit once around milky way- 250 million years






2. A large - irregularly shaped rocky object orbiting the sun mostly between mars and jupiter. Left-over planetesimals






3. The process of acquiring material






4. 30AU to 50Au from sun - consists of ancietn premordial objects made of frozen ice and dust-35000 objects or more that are larger than 100 km in diameter and many more smaller than this






5. Latin for 'cloud'. A word used to describe the collections of gas and dust in the Milky Way and other galaxies






6. The state of having a balance between inward and outard pressures in a gas--the inward force from gravity is balanced by the outward force from heat.






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






8. A small and dim but hot star.






9. A perfect absorber and radiator of electromagnetic radiation.






10. The light produced when particles from the sun collide with atmospheric molecules






11. The rotation period of the Earth measured relative to the stars.






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






13. A very distant - star-like object with huge - broad emission lines. Probably the nucleus of a distant active galaxy.






14. Dying large-mass stars lose their outer layers in a violent explosion creating large - chaotic remnants. these brighten like nova but are so much brighter and only occur ONCE PER STAR






15. The larger bodies that formed early in teh solar nebula that were chemically differentiated






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






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






18. The point where an inferior planet is as far away from the sun as it can be (as seen from the Earth)






19. A subatomic particle with a negative charge. It creates light.






20. The seasonal shifting of a nearby star's position relative to more distant objects.






21. Venus






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






23. Distribution of dust (tells us disk is thin) - find distances to O&B stars and H2 regions (arms are sights of star formation and OB stars live and die at location of birth) -Milky way has four arms. Sun is in spur apart from arms.






24. Plate tectonics due to thickness of crust and maintain their general form when they collide-where most volcanoes are.






25. Heavier elements such as iron - silicon - magnesium - sulfer - nickel






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






27. When material is heated and moves taking the heat energy with it






28. Jupiter






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






30. A long-lived high-pressure bulge in Jupiter's southern hemisphere






31. Either Io -Europa - Ganymede - or Callisto






32. Orbit in Jupiters orbit






33. A word meaning 'the same everywhere throughout.'






34. The amount of density needed to stop the universe from expanding and to begin the big crunch represented by Pc






35. The location in the Milky Way where stars orbit like a solid wheel






36. A streak of light in the atmosphere






37. A rock or iron specimen that has fallen from space






38. A fusion process in which a carbon atom transmutes to oxygen and back - creating a helium atom in the process






39. The displacement of spectral lines to redder colors caused by the expansion of the universe.






40. Electromagnetic Radiation






41. A two-filter measure of the color - and hence temperature - of a star.






42. 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.






43. Small bulges - loosely wound - massive arms - arms have many H2 regions and look very lumpy






44. The area behind a lens where images are resolved






45. A cool collection of gas and dust silhouetted against a brighter background of stars and/or gas






46. 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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47. A star that has become a red giant for the second and final time. It is burning helium to carbon in a shell surrounding the core






48. A plot of star absolute magnitude verses spectral type.






49. Venus






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

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