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






2. The dimming of starlight by intervening dust






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






4. Material that shoots rapidly out into space. Flares cause Auroras






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






6. The fusion process that turns three helium nuclei into a carbon nucleus






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






8. Atmosphere blocks high energy wavelengths - atmosphere blurs optical radiation - atmosphere absorbs some radiation at all wavelengths even when it gets through.






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






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






11. The rotation of a star or planet at different speeds at its equator and poles






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






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






14. The source of the force that is accelerating the expansion rate of the universe.






15. A prominence seen against the disk of the sun






16. What is the universe expanding into?






17. Massive compact halo objects (MACHO) - weakly interacting massive particles (WIMPY's)






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






19. Extremely round - lots of liquid water - ice rafts on surface ACTIVE SURFACE






20. Large nebula consisting of very cold gas and dust






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






22. When the Sun moves from south to north across the celestial equator (about March 21)






23. The philosophical stand that says a simpler explanation is more likely to be correct than a complicated one.

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24. 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.






25. Thick rigid crust - no longer has plate tectonics but still has convective hot spots that create earth-like volcanoes except that last for billions of years because of lack of tectonics.






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






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






28. The temp at which a substance in the vacuum of space solidifies






29. A small chunk of rock in space






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






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

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32. The surface of the sun






33. Mercury






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






35. Elliptical orbits that come inside orbit of the Earth.






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






37. Sudden blasts of gamma radiation from a very distant galaxy caused possibly by a supernova explosion.






38. Sulfurous volcanoes - pools of liquid sulfur - surface resembles cheese pizza ACTIVE SURFACE






39. 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






40. A crystalline patter found in iron meteorites






41. Saturn






42. 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.






43. Wave- only waves cause an interference pattern when passing through a double slit - particle- only particles deposit energy at specific locations (the way an image builds up on digital camera)






44. Venus (retrograde)






45. Possible Fates of the Universe






46. Centered on the Earth






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






48. Venus






49. The area behind a lens where images are resolved






50. 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 _____.