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. An evolved star - past the helium flash that is burning helium to carbon in it's cores






2. The class of all objects having high energy radiation coming from their nuclei. Active Galactic Nucleus- Blazars - Quasars - Radio and Emit synchrotron radiation






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






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






5. Formed from slow rotating clouds - collapsed quicker - initial star formation rate is high but died out - older - little rotation - look redder






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






7. The dark - relativley smooth areas on the moon; Latin for sea






8. Then the Sun moves from north to south across the celestial equator (about September 23)






9. The state of having a balance between inward and outard pressures in a gas--the inward force from gravity is balanced by the outward force from heat.






10. Star speed at outer edge of galaxy should begin to diminish - but they dont so we guess that this means there is increasing force (aka dark matter)






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






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






13. Sudden blasts of gamma radiation from a very distant galaxy caused possibly by a supernova explosion.






14. The assumption that the universe is isotropic (same in all directions) and homogeneous (Same everywhere throughout)






15. What causes the zones and belts on jupiter and saturn?






16. 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.






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






18. 100 nm 10 nm






19. Places in the asteroid belt - caused by resonance with Jupiter - where there are no asteroids






20. The location in an H-are diagram of a star cluster - where stars have just left the main sequence. Used to estimate the cluster age.






21. The movement of the Earth's crustal plates riding on top of the mantle.






22. The rock that makes up the lunar maria






23. Centered on the Earth






24. A term referring to Earth-like planets






25. 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.






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






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






28. 1-orbit aroudn the sun 2- are in hydrostatic equilibrium and 'mostly round' 3- have not cleared debris around its orbit 4- are not satellites






29. 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.






30. The area behind a lens where images are resolved






31. When material is heated and moves taking the heat energy with it






32. A star that is in the process of forming. It glows from gravitational contraction






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






34. The rotation period of the Earth measured relative to the Sun.






35. Mercury - Venus - Earth - Mars






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






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






38. The instant of time after the Big Bang when space and time obtained their characteristics. (t=10^-43 sec when gravity freezes out-instant when gravity started existing as a separate force)






39. A telescope that uses lenses to focus light






40. The oldest terrain on the moon






41. The lowest energy of an atom.






42. 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.






43. In Ptolemy's geocentric solar system - the small circle on which a planet moved.






44. The rotation period of the Earth measured relative to the stars.






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






46. When a planet lines up with the sun inthe sky






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






48. A cool collection of gas and dust silhouetted against a brighter background of stars and/or gas






49. VENUS






50. Jupiter