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 light produced when particles from the sun collide with atmospheric molecules






2. 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






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






4. Distance from sun to nucleus- 8 kiloparsecs (26000 LY) - diameter of Milky way- 150000 LY - length for sun to orbit once around milky way- 250 million years






5. VENUS






6. Light-colored high-pressure bands in Jupiter's atmosphere






7. The era when the ratio of matter to energy greatly favored matter. (verses radiation dominated universe where it was opaque. Matter is now dominated by gravity not photons)






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






9. 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:






10. The Big Bang was not an explosion of matter into empty space - like the explosion of a bomb. Instead - it was an emergence of space and time filled with pure energy where before none of this was present. The point from which is emerged is called the






11. The high- temperatature outer layer of the sun






12. Galaxies whose nuclei emit jets of materil at high speeds. material comes from supermassive black holes






13. Originially thought to be stars emitting radio radiation but are now concluded to be nuclei of distant galaxies (same as radio galaxies aka emit streams of material)






14. A small spherical dark nebula






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






16. A location on an H-are Diagram where evolving stars pulsate






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






18. The material from which the solar system formed






19. The first rock-sized bodies that formed in the solar nebula from dust grains






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






21. A plot of star absolute magnitude verses spectral type.






22. 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






23. Venus (retrograde)






24. Saying that the sky should not get dark at night because all lines of sight end on a star meaning that the night sky should be ablaze BUT the big bang - because the universe had a beginning - says that the sky gets dark because out in space - galaxie

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25. The gap inthe outer portion of Saturn's A ring






26. After stars form they pump light energy into surrounding gas causing it to heat up and glow (H2=ionized hydrogen - H1= neutral hydrogen in molcular couds)






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






28. In what chemical form are jupiters nitrogen - carbon and oxygen?






29. 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.






30. A large and bright but cool star.






31. Neptune or uranus






32. 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)






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






34. Half of the longest diameter across an ellipse






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






36. Approximate speed of light in a vacuum






37. A fusion process in which protons build together to form helium






38. A younger cluster of stars - found in the galaxy disk






39. The rock that makes up the lunar maria






40. Venus






41. 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.






42. Light scattered through the atmosphere that degrades astronomical images






43. 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






44. Mercury






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






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






47. A very dense - highly populated cluster of galaxies






48. 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)






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






50. A nearby galaxy with a quasar-like nucleus. closer but less bright than quasars-weaker