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. The particle horizon is the farthest we can see. It exists because the universe had a beginning and thus a definite age. Light from distances farther away from the particle horizon have not had time to reach us yet.






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






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






4. 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






5. The amount of density needed to stop the universe from expanding and to begin the big crunch represented by Pc






6. The mirror that determines the focus configuration of a reflector






7. Venus






8. A collection of galaxies like the one the Milky Way belongs to






9. The slow wobble of the Earth on its rotation axis.






10. The rate of expansion of the universe.






11. 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.






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






13. Approximate speed of light in a vacuum






14. A point in the sky where meteors appear to come from during a shower






15. A cloud of ionized hydrogen. Formed when young stars heat the surrounding gas






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






17. 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






18. A star that erratically and explosively brightens and dims






19. In a CLOSED UNIVERSE - the curvature of space-time is _________. Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is _____.






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






21. The ratio of the actual density of the universe to the critical density. (actual density divided by the critical density






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






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






24. A planet orbiting about a distant star






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






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






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






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






29. The apparent backward motion of a planet against the background of stars.






30. The amount of density needed to stop the universe from expanding and to begin the big crunch represented by Pc






31. First accurately measured the speed of light in a vacuum






32. 30AU to 50Au from sun - consists of ancietn premordial objects made of frozen ice and dust-35000 objects or more that are larger than 100 km in diameter and many more smaller than this






33. 1. We see rapid movements or high energy radiation coming at some level from the nuclei of nearly every galaxy we have looked at. 2. We suspect that the creation of these supermassive black holes is part of the galaxy formation process.






34. The displacement of spectral lines to redder colors caused by the expansion of the universe.






35. 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)






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






37. The 'edge' of the universe. Light beyond this has not reached us yet.






38. The ratio of the actual density of the universe to the critical density. (actual density divided by the critical density






39. 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)






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






41. The rock that makes up the lunar highlands






42. The surface of the sun






43. When one side of a body always faces the planet it revolves around






44. That which is responsible for Jupiter's magnetic field






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

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46. The mass of an object divided by its volume






47. Is space infinitely large?

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






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