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. A collection of comets in the plane of the solar system - located beyond the orbit of Pluto






2. The mix of pure photon energy that emerged at the start of the universe.






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






4. Matter so dense that even light cannot escape its gravity






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






6. Centered on the sun.






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






8. All wavelengths of light emitted by a blackbody.






9. The imaginary sphere centered on the Earth that hols the stars.






10. A change in the wavelength of light caused by a motion between the observer and light (or wave) source (blue shift if getting closer - red shift if moving away)






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






12. A cloud of ionized hydrogen. Formed when young stars heat the surrounding gas






13. The mix of pure photon energy that emerged at the start of the universe.






14. Young clusters in disk are irregularly shaped since they have no time to relax into the rounder relaxed shape of globular clusters-will constantly be torn apart and assimilated.






15. The mass of an object divided by its volume






16. 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






17. Small bulges - loosely wound - massive arms - arms have many H2 regions and look very lumpy






18. The ratio of the actual density of the universe to the critical density. (actual density divided by the critical density






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






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






21. A planet that is farther from the sun than the Earth is






22. Either Io -Europa - Ganymede - or Callisto






23. The point directly overhead.






24. Stars orvits do not define the spiral patterns - instead they are density waves that move at slower speeds (arms are defined by young O and B stars and gas clouds)






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






26. Is space infinitely large?

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27. Formed rapidly - collapsed slower into disk shape - star birth rate is low but lasts longer and ongoing - contain higher mass blue stars.






28. Sulfurous volcanoes - pools of liquid sulfur - surface resembles cheese pizza ACTIVE SURFACE






29. VENUS






30. The area behind a lens where images are resolved






31. A planet orbiting about a distant star






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






33. The part of the Milky way that has on-going star formation






34. Dying large-mass stars lose their outer layers in a violent explosion creating large - chaotic remnants. these brighten like nova but are so much brighter and only occur ONCE PER STAR






35. Hydrogen and helium (mainly)






36. 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.






37. A term referring to the orbital character of stars near the Sun






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






39. Saturn






40. The wavelengths where a specific element can absorb or emit light.






41. Venus (retrograde)






42. The imaginary sphere centered on the Earth that hols the stars.






43. The amount an image is enlarged by a telescope






44. A star fusing hydrogen to helium in it's core






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






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






47. When the Moon entirely blocks the Sun.






48. Disk dust grains are made of all the elements that are not in gaseous form in space which blocks starlight and causes interstellar extinction






49. 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






50. The family of radiant energy that includes light as a subset