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. Matter that reveals itself only through its gravitational attraction






3. A word used in astronomy to describe all elements besides hydrogen and helium






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






5. Sc galaxies where star formation and destruction is so rapid that supernova explosions are mainly responsible for compressing gas to create new stars.






6. A logarithmically scaled value for the measured brightness of a star.






7. An important quality of telescopes that increases as the square of the primary mirror or objective lens






8. 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.






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






10. Matter that reveals itself only through its gravitational attraction.






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






12. The organization of clusters of galaxies into sheets and strings






13. A distance measure determined by the shifting of a star against the background sky every 6 months.






14. 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.






15. Sc galaxies






16. A crystalline patter found in iron meteorites






17. A measure of how an object resists accelerating when acted upon by a force. It is proportional the amount of matter in an object






18. The study of the universe as a whole.






19. 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)






20. A small and dim but hot star.






21. The apparent backward motion of a planet against the background of stars.






22. The apparent magnitude a star would have if it were at a distance of 10 parsecs.






23. The number of protons in an atom.






24. The rock that makes up the lunar highlands






25. All wavelengths of light emitted by a blackbody.






26. A term referring to Jupiter-like planets






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






28. What are the three possible geometries of the universe?






29. A star that erratically and explosively brightens and dims






30. Small compact stars called white dwarfs can have material deposited on their surfaces. In time material heats up and explodes in surface nuclear reaction- star brightens - settles - repeats.






31. The slow wobble of the Earth on its rotation axis.






32. The distance a moon can be from a planet before shattering from tidal forces






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






34. The dark - relativley smooth areas on the moon; Latin for sea






35. 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)






36. The mass of an object divided by its volume






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






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






39. Finding a star's absolute magnitude from it's placement on an HR diagram. After finding the absolute magnitude - we measure the apparent magnitude - for a distance modulus and use this to find the distance. This method is good for finding distances t






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






41. A particle of light






42. Saturn






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






44. A change in the wavelength of light caused by a motion between the observer and light (or wave) source (blue shift if getting closer - red shift if moving away)






45. Extends to a distance of 50000AU. Same objects as in the Kuiper belt-when they fall in toward the sun they become comets. Debris from comets hitting the Earths atmosphere cause meteor showers.






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






47. Saying that the sky should not get dark at night because all lines of sight end on a star meaning that the night sky should be ablaze BUT the big bang - because the universe had a beginning - says that the sky gets dark because out in space - galaxie

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48. Extends to a distance of 50000AU. Same objects as in the Kuiper belt-when they fall in toward the sun they become comets. Debris from comets hitting the Earths atmosphere cause meteor showers.






49. A large and bright but cool star.






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