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






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






3. 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.






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






5. Rich= dense crowded cores of galaxies - poor= few members and a looser organization of galaxies






6. 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.






7. The gap etween saturn's A and B rings






8. The oldest terrain on the moon






9. A spinning neutron star






10. The process responsible for creating the arms of flocculent spiral galaxies






11. 10^2 nm 10^7 nm






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






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






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






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






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






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






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






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






20. Highlands: rocks are made of lighter anorthosite (similar to old earth rocks) Maria: rocks made of heavy mare basalt (volcanic rock) everywhere else is loose regolith created by meteoric impact.






21. The law that predicts the possible types of spectra.

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22. Hurricane-like vortex in southern-hemisphere winds to north and south blow in opposite directions which keep it spinning and with no subsurface features like mountians it persists.






23. 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 ________.






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






25. Hurricane-like vortex in southern-hemisphere winds to north and south blow in opposite directions which keep it spinning and with no subsurface features like mountians it persists.






26. The average distance between the Earth and the Sun (=1.5 x10^8km)






27. The location around an atom where an electron resides.






28. A technique using computer-controlled mirrors to sharpen images distorted by the atmosphere






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






30. When the Sun moves from south to north across the celestial equator (about March 21)






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






32. An entity that is likely in the nucleus of most - if not all - galaxies.






33. The lowest energy of an atom.






34. 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






35. The opaque universe that existed for 300000 years after the Big Bang. (photons outnumbered nuclei by 1 billion to one - so less light)






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






37. A highly variable galaxy nucleus of which BL Lac is one. Their light is highly energetic and their spectra are featureless. (face on)






38. The particle horizon is the farthest we can see. It exists because the universe had a beginning and thus a definite age. Light from distances farther away from the particle horizon have not had time to reach us yet.






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






40. The entity responsible for spiral arms in grand-design spiral galaxies






41. A galaxy sending out a stream of material from its nucleus






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






43. The surface of the sun






44. A telescope that uses lenses to focus light






45. The average distance between the Earth and the Sun (=1.5 x10^8km)






46. A galaxy sending out a stream of material from its nucleus






47. A high-pressure bulge in Neptune's southern hemisphere






48. Neptune or uranus






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






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