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






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






3. 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 _____.






4. Consists of old red stars in slow orbits that plunge through disk and bulge. about 1% are old - round globular clusters.






5. 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)






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






7. A perfect absorber and radiator of electromagnetic radiation.






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






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






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






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






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






13. A continuous spectrum of light missing energy at a few wave lengths.






14. 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.






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






16. The universe is isotropic - homogeneous - and without beginning or end in time and space. If the universe is truly homogeneous then every line of sight will eventually end on a galaxy. If it has existed forever then there has been enough time for lig

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






18. A change in the appearance of the sun at the edge of the solar disk






19. A telescope that uses mirrors to focus light






20. 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.






21. Material that shoots rapidly out into space. Flares cause Auroras






22. Medium bulge - moderately would arms - arms have H2 regions in them and look sort of lumpy






23. A rock or iron specimen that has fallen from space






24. Orbit in Jupiters orbit






25. The faint glow of light left over from the Big Bang. cosmic microwave background are the photons that remain after the big bang that have not turned into matter.






26. A prominence seen against the disk of the sun






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






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






29. Loops that trace the magnetic field as it erupts from a sunspot area and arches over to an adjacent area. They glow in the light of gas pouring out of corona and falling into photosphere.






30. Infinitely long -> 10 cm






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






32. Radiation emitted when charged particles spiral rapidly in a magnetic field. come off of jets from black holes.






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






34. The nuclei of very distant galaxies. Likely a manifestation of supermassive black holes






35. Mercury - Venus - Earth - Mars






36. Matter that reveals itself only through its gravitational attraction






37. The larger bodies that formed early in teh solar nebula that were chemically differentiated






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






39. The relation that tells how light dims with distance.






40. A very distant - star-like object with huge - broad emission lines. Probably the nucleus of a distant active galaxy.






41. Large nebula consisting of very cold gas and dust






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






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






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






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






46. A galaxy emitting large amounts of energy at long wavelengths.






47. The equation that describes how matter equates with energy






48. The area behind a lens where images are resolved






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






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