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. Hot cells of gas that rise and fall in the hotosphere






2. The telescope configuration that has the focus placed at the back of the primary mirror






3. A large and bright but cool star.






4. A spinning neutron star






5. Infinitely long -> 10 cm






6. We can infer the absolute magnitude of pulsating variable stars by measuring their pulsation periods. The longer the pulsations - the greater their luminosities. We then again measure their apparent magnitudes - compare it with their absolute magnitu






7. The time when the universe cooled sufficiently for atoms to exist. radiation dominated= first 300000 years - THEN era of recombination turns into matter dominated for next.






8. The process similar to conduction by which energy moves from the solar core to the convective layer






9. A fusion process in which protons build together to form helium






10. Ganymede






11. Galaxies whose nuclei emit jets of materil at high speeds. material comes from supermassive black holes






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






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






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






15. 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)






16. A spectrum of light with energy at only a few wavelengths.






17. The projection of the Earth's equator onto the celestial sphere.






18. When material is heated and moves taking the heat energy with it






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






20. A technique using computer-controlled mirrors to sharpen images distorted by the atmosphere






21. Where is the center of the expansion






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






23. 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:






24. Venus






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






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






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






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






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






30. A younger cluster of stars - found in the galaxy disk






31. 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.






32. Ganymede






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






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






35. The time when the universe cooled sufficiently for atoms to exist. radiation dominated= first 300000 years - THEN era of recombination turns into matter dominated for next.






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






37. A two-filter measure of the color - and hence temperature - of a star.






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






39. The entity from which the whole universe is postulated to have come from.






40. 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.






41. How did Earth come to have an oxygen rich atmosphere?






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






43. The Greek philosopher responsible for making the stellar magnitude scale.






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






45. The location in the Milky Way where stars orbit like a solid wheel






46. 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.






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






48. Radiation given off by electrons accelerating in a magnetic field






49. After stars form they pump light energy into surrounding gas causing it to heat up and glow (H2=ionized hydrogen - H1= neutral hydrogen in molcular couds)






50. Infinitely long -> 10 cm