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. A rock or iron specimen that has fallen from space






2. Form honeycomb like patterns surrounding empty or nearly empty voids.






3. A star that erratically and explosively brightens and dims






4. The mirror that gathers the light in a reflector






5. 10^2 nm 10^7 nm






6. A spherical shell of comets that orbit the sun at a great distance (roughly two light years from the sun)






7. The number of protons in an atom.






8. A star fusing hydrogen to helium in it's core






9. 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.






10. 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.






11. Norhern lowlands- darker in color and have far fewer craters as if an ancient sea or ice field covered them. southern highlands- much higher in density of craters.






12. 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 _____.






13. 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.






14. Electromagnetic Radiation






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






16. Hydrogen and helium (mainly)






17. A particle of light






18. A volume of space where few - if any - galaxies are located






19. A small spherical dark nebula






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






21. A long-lived high-pressure bulge in Jupiter's southern hemisphere






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






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






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






25. The point in its orbit where a planet is nearest the sun






26. 100 nm 10 nm






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






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






29. The shadow area behind the Earth or Moon where the Sun is completely obscured.






30. Half of the longest diameter across an ellipse






31. The point where an inferior planet is as far away from the sun as it can be (as seen from the Earth)






32. A perfect absorber and radiator of electromagnetic radiation.






33. The cosmological principle is the assumption that the universe is isotropic and homogeneous.The Big Bang assumes it to be a correct principle so that what we observe is exactly like What is too far away to be observed.






34. Where is the center of the expansion






35. Arcs of increased mass concentration that slow stars and gas down as they orbit through which cause the formation of stars.






36. A high-pressure bulge in Neptune's southern hemisphere






37. The rotation period of the Earth measured relative to the Sun.






38. A spinning neutron star






39. Loops that trace the magnetic field as it erupts from a sunspot area and arches over to an adjacent area. They glow in the light of gas pouring out of corona and falling into photosphere.






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






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






42. Radiation (possibly left over from the big bang) that fills the universe. Perfect black body spectrum and tells us a bit aout how galaxies are formed.






43. N=are*Fp(Ne)(Fl)(Fi)(Fc)(L) N: number of civilizations possible to communicate with are*: rate solar-like stars are created Fp: fraction of stars with planets Ne: number of planets like ours Fl: fraction of planets with life Fi: intelligent life Fc:






44. A star that is burning hydrogen to helium in a shell surrounding it's core






45. The shadow behind the Earth or Moon where the Sun is partially obscured.






46. A subatomic particle with a negative charge. It creates light.






47. 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 ________.






48. Distance from sun to nucleus- 8 kiloparsecs (26000 LY) - diameter of Milky way- 150000 LY - length for sun to orbit once around milky way- 250 million years






49. Formed rapidly - collapsed slower into disk shape - star birth rate is low but lasts longer and ongoing - contain higher mass blue stars.






50. A phenomenon seen when the Earth passes through the orbit of a burned out comet