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. First accurately measured the speed of light in a vacuum






2. As open clusters age - they push gas away but dust remains this can reflect light giving the cluster a blue-ish color. also called reflection nebula






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






4. 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






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






6. Population 1 with higher metals and contain many young stars in star clusters. Distribution of stars is everywhere in disk (arms only have 5% more stars)






7. 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






8. A particle of light






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






10. The process of acquiring material






11. The surface of the sun






12. A large and bright but cool star.






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






14. 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.






15. Electromagnetic Radiation






16. A representation of the changes in color and brightness of an evolving protostar.






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






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






19. The act of removing an electron from an atom.






20. The equation that describes how matter equates with energy






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






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






23. The surface of the sun






24. 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.






25. Mercury






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






27. Europa






28. Heavier elements such as iron - silicon - magnesium - sulfer - nickel






29. Latin for 'cloud'. A word used to describe the collections of gas and dust in the Milky Way and other galaxies






30. Relativity predicts that nothing can travel faster than the speed of light in a vacuum - How can it move slower?






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






32. Distribution of dust (tells us disk is thin) - find distances to O&B stars and H2 regions (arms are sights of star formation and OB stars live and die at location of birth) -Milky way has four arms. Sun is in spur apart from arms.






33. N=are*Fp(Ne)(Fl)(Fi)(Fc)(L) N: number of civilizations possible to communicate with are*: rate solar-like stars are created Fp: fraction of stars with planets Ne: number of planets like ours Fl: fraction of planets with life Fi: intelligent life Fc:






34. The force of attraction between any two objects having mass






35. Theory virtually demands that the geometry of the universe be ______. Results of measuring lumps in the cosmic background radiation indicate that the universe geometry is ________.






36. An important quality of telescopes that increases as the square of the primary mirror or objective lens






37. The distance between a lens and its focal plane






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






39. 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.






40. The time when the universe cooled sufficiently for atoms to exist. radiation dominated= first 300000 years - THEN era of recombination turns into matter dominated for next.






41. Venus






42. The crust of a meteorite caused by its entry into Earth's atmosphere






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






44. A word meaning 'the same everywhere throughout.'






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






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






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






48. 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.






49. A measure of the ability of a telescope to see fine detail






50. The process similar to conduction by which energy moves from the solar core to the convective layer