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






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






3. The measure of a variable star's apparent magnitude as it brightens and dims with time






4. Titan






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






6. A star that erratically and explosively brightens and dims






7. 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.






8. The amount an image is enlarged by a telescope






9. A star that erratically and explosively brightens and dims






10. Milky way galaxy is a member - a small poor cluster-about 30 galaxies






11. 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.






12. 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.






13. The distance between a lens and its focal plane






14. An empirical scheme for predictin ghe orbital distances of planets






15. The science of measuring light energy by wavelength.






16. The most mass a white dwarf can have before collapsing to a neutron star






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






18. The equation that describes how matter equates with energy






19. Ganymede






20. Neptune or uranus






21. The Big Bang says that the universe has not existed forever. It had a distinct beginning about 14 billion years ago called the 'Big Bang'. Therefore light from any object more than 14 billion light years away has not had time to reach us. The other p

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






23. 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.






24. 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 ________.






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






26. All possible types of energy that can be emitted and absorbed by atoms.






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






28. 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 _____.






29. Ganymede






30. The oldest grouping of stars - found in the galaxy halo






31. Jupiter - Saturn - Uranus - Neptune






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






33. Collections of young - hot stars






34. 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.






35. Centered on the sun.






36. The fate of the universe if it is closed. The universe expanding as much as possible and then retracting






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






38. Matter that reveals itself only through its gravitational attraction






39. The dimming of starlight by intervening dust






40. A small chunk of rock in space






41. 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.






42. A huge sphere of tenuous gas surrounding the nucleus of a comet






43. The lowest energy of an atom.






44. Elliptical orbits that come inside orbit of the Earth.






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






46. Small moons that maintain the shape of rings around Saturn and Uranus






47. The point in its orbit where a planet is nearest the sun






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






49. Extends to a distance of 50000AU. Same objects as in the Kuiper belt-when they fall in toward the sun they become comets. Debris from comets hitting the Earths atmosphere cause meteor showers.






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