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. Elliptical orbits that come inside orbit of the Earth.






2. Ancient stream channels - flood planes - and sedimentary-type rock. Frozen water is found in the polar ice caps and in the soil.






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






4. Very center of galaxy. suggestion of a black hole






5. Formed from slow rotating clouds - collapsed quicker - initial star formation rate is high but died out - older - little rotation - look redder






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






7. The family of radiant energy that includes light as a subset






8. The powdered stone fragments that make up the lunar 'soil'






9. The most mass a white dwarf can have before collapsing to a neutron star






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






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






12. The process of acquiring material






13. The entity responsible for spiral arms in grand-design spiral galaxies






14. 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 _____.






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






16. Clouds of low density gas often found glowing faintly on either side of an AGN.






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






18. 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.






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






20. Cold aggregates of gas - large and contain a huge amount of matter - so cold that molecules stick together to form molecules.






21. 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)






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






23. 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.






24. A planet orbiting about a distant star






25. The imaginary sphere centered on the Earth that hols the stars.






26. In Ptolemy's geocentric solar system - the large circle on which a planet's epicycle moved around the Earth.






27. The opaque universe that existed for 300000 years after the Big Bang. (photons outnumbered nuclei by 1 billion to one - so less light)






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






29. The instant of time after the Big Bang when space and time obtained their characteristics. (t=10^-43 sec when gravity freezes out-instant when gravity started existing as a separate force)






30. Hydrogen and helium (mainly)






31. The science of measuring the apparent magnitudes of stars by imaging them through different filters.






32. The point directly overhead.






33. Dark - reddish - low-pressure bands in Jupiter's atmosphere






34. Originially thought to be stars emitting radio radiation but are now concluded to be nuclei of distant galaxies (same as radio galaxies aka emit streams of material)






35. Earth






36. A toroidal or donut-shaped collection of material attracted to a central body like a star or black hole. Dust around an object






37. A measure of the seasonal shifting of a star's position against farther stars or galaxies. The closer the star - the greater is the angular distance it shifts. We use it to find distances to stars that are up to 1000 pc away.






38. IO






39. 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.






40. A word meaning 'the same in all directions.'






41. A push or a pull






42. Dying small mass stars lose their outer layers in a relatively gentle way - creating a round or bipolar nebula about the star (round like planets)






43. What Ole Roemer used to measure the speed of light in a vacuum






44. A small spherical dark nebula






45. Cold aggregates of gas - large and contain a huge amount of matter - so cold that molecules stick together to form molecules.






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






47. Jupiter






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






49. A particle of light.






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