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. 10 cm -> 1 mm






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






3. The rotation period of the Earth measured relative to the stars.






4. A small chunk of rock in space






5. 1μm 100 nm






6. A change in the appearance of the sun at the edge of the solar disk






7. Rich= dense crowded cores of galaxies - poor= few members and a looser organization of galaxies






8. A galaxy emitting large amounts of energy at long wavelengths.






9. 1 mm 1μm






10. 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.






11. 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.






12. A star that has become a red giant for the second and final time. It is burning helium to carbon in a shell surrounding the core






13. 10^2 nm 10^7 nm






14. Small compact stars called white dwarfs can have material deposited on their surfaces. In time material heats up and explodes in surface nuclear reaction- star brightens - settles - repeats.






15. A term referring to the orbital character of stars near the Sun






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






17. The study of the universe as a whole.






18. The law that describes the blackbody curve - and let to quantum mechanics.

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






20. A crystalline patter found in iron meteorites






21. A small chunk of rock in space






22. Neptune or uranus






23. A term referring to Jupiter-like planets






24. Mercury






25. 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.






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






27. The place in the sky that the Earth's axis points toward (can be either north or south)






28. An empirical scheme for predictin ghe orbital distances of planets






29. Matter that reveals itself only through its gravitational attraction






30. 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:






31. A telescope that uses mirrors to focus light






32. 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.






33. A term referring to Earth-like planets






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






35. 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.






36. Venus (retrograde)






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






38. Highlands: rocks are made of lighter anorthosite (similar to old earth rocks) Maria: rocks made of heavy mare basalt (volcanic rock) everywhere else is loose regolith created by meteoric impact.






39. When the Sun is farthest north of the celestial equator (about June 22)






40. Matter so dense that even light cannot escape its gravity






41. Half of the longest diameter across an ellipse






42. The surface of the sun






43. The linear correlation between the rate of the expansion of the universe and distance. Says that as galaxies get farther away in space - the speed with which they recede from us increases. So we can measure the amount of recessional velocity and use






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






45. 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.






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






47. A planet orbiting about a distant star






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






49. 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)






50. Poitns of gravitational stability in the orbit of a planet