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. Radiation emitted when charged particles spiral rapidly in a magnetic field. come off of jets from black holes.






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






3. The linear correlation between the rate of the expansion of the universe and distance. Says that as galaxies get farther away in space - the speed with which they recede from us increases. So we can measure the amount of recessional velocity and use






4. A galaxy sending out a stream of material from its nucleus






5. Infinitely long -> 10 cm






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






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






8. A term referring to the orbital character of stars near the Sun






9. A bridge of material held in position above the solar surface. They can remain for hours even days






10. When the Sun is farthest south of the celestial equator (About December 22)






11. A very dense - highly populated cluster of galaxies






12. In what chemical form are jupiters nitrogen - carbon and oxygen?






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






14. Long - meandering cliff formed when a planet surface cools and shrinks






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






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






17. A star without enough mass to begin hydrogen fusion






18. The 'edge' of the universe. Light beyond this has not reached us yet.






19. 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






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






21. 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.






22. An entity that is likely in the nucleus of most - if not all - galaxies.






23. The surface of the sun






24. The mix of pure photon energy that emerged at the start of the universe.






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






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






27. Places in the asteroid belt - caused by resonance with Jupiter - where there are no asteroids






28. 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.






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






30. 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)






31. 1-orbit aroudn the sun 2- are in hydrostatic equilibrium and 'mostly round' 3- have not cleared debris around its orbit 4- are not satellites






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






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






34. Matter so dense that even light cannot escape its gravity






35. When massive objects bend space and time enough to create multiple images of an object located behind them






36. Is space infinitely large?


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






38. 1 mm 1μm






39. 10 nm 10^2 nm






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






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






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






43. The mirror that gathers the light in a reflector






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






45. The Big Bang was not an explosion of matter into empty space - like the explosion of a bomb. Instead - it was an emergence of space and time filled with pure energy where before none of this was present. The point from which is emerged is called the






46. The trapping of heat by carbon dioxide or other gases in the Earth's atmosphere.






47. A crystalline patter found in iron meteorites






48. Approximate speed of light in a vacuum






49. A huge sphere of tenuous gas surrounding the nucleus of a comet






50. Small moons that maintain the shape of rings around Saturn and Uranus