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






2. The universe is isotropic - homogeneous - and without beginning or end in time and space. If the universe is truly homogeneous then every line of sight will eventually end on a galaxy. If it has existed forever then there has been enough time for lig

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3. 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.






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






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






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






7. When the Moon entirely blocks the Sun.






8. A measure of how an object resists accelerating when acted upon by a force. It is proportional the amount of matter in an object






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






10. Flat disk with gas - dust - H2 regions - molecular clouds - dust young stars and remnants of old planetary nebula and supernova remnants. stars spin together with similar velocities called differential rotation






11. IO






12. Venus






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






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






15. The area behind a lens where images are resolved






16. A bridge of material held in position above the solar surface. They can remain for hours even days






17. Milky way galaxy is a member - a small poor cluster-about 30 galaxies






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






19. The distance between a lens and its focal plane






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






21. A star that blows itself apart






22. The surface of the sun






23. The faint glow of light left over from the Big Bang. cosmic microwave background are the photons that remain after the big bang that have not turned into matter.






24. The final end state of an intermediate to high mass star. An entity in which all the electrons have been pushed into the protons.






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






26. The point directly overhead.






27. A large - irregularly shaped rocky object orbiting the sun mostly between mars and jupiter. Left-over planetesimals






28. Is space infinitely large?

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29. Infinitely long -> 10 cm






30. 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.






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






32. Matter that reveals itself only through its gravitational attraction.






33. 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.






34. The elementary building blocks from which protons and neutrons are formed.






35. The light produced when particles from the sun collide with atmospheric molecules






36. The number of protons in an atom.






37. What is the universe expanding into?






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






39. A planet orbiting about a distant star






40. Light-flaky crust - convective currents cause it to wrinkle and bunch (1/5 of surface). uniform cratering suggests lack of weathering and tectonics. volcanoes are flat due to atmospheric pressure.






41. A nearby galaxy with a quasar-like nucleus. closer but less bright than quasars-weaker






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






43. How is the Hubble Law consistent with an expanding universe?






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






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






46. A star that erratically and explosively brightens and dims






47. Mercury and venus






48. The science of measuring light energy by wavelength.






49. Young clusters in disk are irregularly shaped since they have no time to relax into the rounder relaxed shape of globular clusters-will constantly be torn apart and assimilated.






50. Stars fromt he Halo that have drifted into the disk. as earth zooms past them in a faster orbit they appear to be going backward very fast