Test your basic knowledge |

Subject : science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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 term referring to the orbital character of stars near the Sun






2. 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.






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






4. A small and dim but hot star.






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






6. A planet that is farther from the sun than the Earth is






7. 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






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






9. Mercury






10. The surface of the sun






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






12. The oldest part of the Milky Way






13. A star that erratically and explosively brightens and dims






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






15. 1 mm 1μm






16. When the Moon entirely blocks the Sun.






17. The apparent path of the Sun through the stars on the celestial sphere.






18. A huge sphere of tenuous gas surrounding the nucleus of a comet






19. 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.






20. A repeated - periodic push or pull capable of summing into a larger push or pull






21. The mirror that gathers the light in a reflector






22. A particle of light






23. A rock or iron specimen that has fallen from space






24. 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






25. Extremely round - lots of liquid water - ice rafts on surface ACTIVE SURFACE






26. VENUS






27. The rock that makes up the lunar maria






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






29. Electromagnetic Radiation






30. Plate tectonics due to thickness of crust and maintain their general form when they collide-where most volcanoes are.






31. Is space infinitely large?


32. Ganymede






33. 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.






34. A very dense - highly populated cluster of galaxies






35. Population 1- similar to the sun and 2% of elements are metal - Population 2- formed before gas was metal- only a fraction of mass is metal.






36. 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.






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






38. Wave- only waves cause an interference pattern when passing through a double slit - particle- only particles deposit energy at specific locations (the way an image builds up on digital camera)






39. A particle of light.






40. The oldest grouping of stars - found in the galaxy halo






41. Flattened spherical distribution of old stars with some young stars too. 'hub' of Milky way - stars orbit with solid body speeds. Elongated into bar shape






42. Large bulge - tightly wound spiral arms - relatively few h2 regions and are smooth






43. Radiation emitted when charged particles spiral rapidly in a magnetic field. come off of jets from black holes.






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






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






46. Centered on the sun.






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






48. The imaginary sphere centered on the Earth that hols the stars.






49. Stars orvits do not define the spiral patterns - instead they are density waves that move at slower speeds (arms are defined by young O and B stars and gas clouds)






50. When the Sun moves from south to north across the celestial equator (about March 21)