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






2. A force exerted by reflecting sunlight






3. Mercury






4. The temp at which a substance in the vacuum of space solidifies






5. VENUS






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






7. Why does the earth have few craters while the moon has many?






8. A telescope that uses mirrors to focus light






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






10. Centered on the Earth






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






12. 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.






13. 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)






14. A toroidal or donut-shaped collection of material attracted to a central body like a star or black hole. Dust around an object






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






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






17. The measure of a variable star's apparent magnitude as it brightens and dims with time






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






19. A fusion process in which a carbon atom transmutes to oxygen and back - creating a helium atom in the process






20. Form honeycomb like patterns surrounding empty or nearly empty voids.






21. 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






22. Is space infinitely large?

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23. Ganymede






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






25. 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.






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






27. Electromagnetic Radiation






28. A collection of comets in the plane of the solar system - located beyond the orbit of Pluto






29. A planet that is closer to the sun than the earth






30. What Ole Roemer used to measure the speed of light in a vacuum






31. The trapping of heat by carbon dioxide or other gases in the Earth's atmosphere.






32. Large nebula consisting of very cold gas and dust






33. Long - meandering cliff formed when a planet surface cools and shrinks






34. Old - pock marked - icy surface - interior is not differentiated - geologically dead - NOT ACTIVE SURFACE






35. The state of having a balance between inflowing and outflowing heat-- the temp at every radial point is different but constant






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






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






38. Moon in less than the angular diameter of the Sun.






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






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






41. Atmosphere blocks high energy wavelengths - atmosphere blurs optical radiation - atmosphere absorbs some radiation at all wavelengths even when it gets through.






42. The point directly overhead.






43. A star that blows itself apart






44. A toroidal or donut-shaped collection of material attracted to a central body like a star or black hole. Dust around an object






45. A faint - remarkably uniform distribution of radiation in space






46. The apparent magnitude a star would have if it were at a distance of 10 parsecs.






47. Titan






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






49. Norhern lowlands- darker in color and have far fewer craters as if an ancient sea or ice field covered them. southern highlands- much higher in density of craters.






50. Jupiter