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. Sa - Sb galaxies where two magnificent arms wind their way from nucleus out in a symmetrical manner.






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






3. 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






4. The area behind a lens where images are resolved






5. Mercury and venus






6. 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 ________.






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






8. 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.






9. The ratio of the actual density of the universe to the critical density. (actual density divided by the critical density






10. VENUS






11. The part of the Milky way that has on-going star formation






12. The final end state of an intermediate to high mass star. An entity in which all the electrons have been pushed into the protons.






13. 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.






14. Collections of young - hot stars






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






16. Dark areas on the sun that are cooler than the surrounding photosphere






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






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






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






20. That which is responsible for Jupiter's magnetic field






21. Mercury






22. Flattened spherical distribution of old stars with some young stars too. 'hub' of Milky way - stars orbit with solid body speeds. Elongated into bar shape






23. The sinking of denser elements to the center of a young molten planet






24. A star without enough mass to begin hydrogen fusion






25. The movement of the Earth's crustal plates riding on top of the mantle.






26. Dark areas on the sun that are cooler than the surrounding photosphere






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






28. The distance between a lens and its focal plane






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






30. An energetic event taking place in the early universe






31. A spinning neutron star






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






33. 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.






34. Flattened spherical distribution of old stars with some young stars too. 'hub' of Milky way - stars orbit with solid body speeds. Elongated into bar shape






35. Venus






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






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






38. An evolved star - past the helium flash that is burning helium to carbon in it's cores






39. The material from which the solar system formed






40. 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)






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






42. The state of having a balance between inflowing and outflowing heat-- the temp at every radial point is different but constant






43. An energetic event taking place in the early universe






44. Old - pock marked - icy surface - interior is not differentiated - geologically dead - NOT ACTIVE SURFACE






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






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






47. Ganymede and Titan






48. The line on an H-are diagram going from upper left to lower right where normal stars of different masses reside.






49. Consists of old red stars in slow orbits that plunge through disk and bulge. about 1% are old - round globular clusters.






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