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. Collections of young - hot stars






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






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






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






5. The point directly overhead.






6. The distance between a lens and its focal plane






7. The shadow behind the Earth or Moon where the Sun is partially obscured.






8. The distance light travels in one year (=9.46x10^12km).






9. Mercury






10. Largest moon in solar system - two differenet types of terrain - darker terrain is older - NOT ACTIVE SURFACE






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






12. The fate of the universe if it is closed. The universe expanding as much as possible and then retracting






13. A prominence seen against the disk of the sun






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






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






16. The powdered stone fragments that make up the lunar 'soil'






17. A term referring to Jupiter-like planets






18. How did Earth come to have an oxygen rich atmosphere?






19. Jupiter






20. Ganymede and Titan






21. Sc galaxies






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






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






24. A very low mass particle formed in solar fusion reactions that reacts only weakly with matter






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






26. 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.






27. We can infer the absolute magnitude of pulsating variable stars by measuring their pulsation periods. The longer the pulsations - the greater their luminosities. We then again measure their apparent magnitudes - compare it with their absolute magnitu






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






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






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






31. The law that syas light energy from a blackbody increases as (temperature^4)






32. Mercury and venus






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






34. A logarithmically scaled value for the measured brightness of a star.






35. The point where a superior planet is as far away from the sun as it can be (as seen from the Earth)






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






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






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






39. 10 nm 10^2 nm






40. 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.






41. Centered on the Earth






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






43. The organized effort to find life elsewhere in the universe. (Search for Extra-Terrestrial Intelligence)






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






45. The name for the only seriously considered theory of the universe.






46. The dimming of starlight by intervening dust






47. A very dense - highly populated cluster of galaxies






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






49. A volume of space where few - if any - galaxies are located






50. In a FLAT UNIVERSE(our universe) - the curvature of space-time is ________. Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is _____.