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






2. That which is responsible for Jupiter's magnetic field






3. A toroidal or donut-shaped collection of material attracted to a central body like a star or black hole. Dust around an object






4. A quantity measuring the stability of the Earth's atmosphere






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 rock or iron specimen that has fallen from space






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






8. The place in the sky that the Earth's axis points toward (can be either north or south)






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






10. The philosophical stand that says a simpler explanation is more likely to be correct than a complicated one.

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11. Is there water on the moon?






12. Mercury






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






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






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






16. A perfect absorber and radiator of electromagnetic radiation.






17. When particles are compressed to an unnatural state where their pressure is not related to their temperature






18. The mirror that determines the focus configuration of a reflector






19. A spectrum of light with energy at only a few wavelengths.






20. Matter that reveals itself only through its gravitational attraction.






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






22. Sa - Sb galaxies where two magnificent arms wind their way from nucleus out in a symmetrical manner.






23. 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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24. A collection of galaxies like the one the Milky Way belongs to






25. The material from which the solar system formed






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






27. A large - irregularly shaped rocky object orbiting the sun mostly between mars and jupiter. Left-over planetesimals






28. Any class of objects with a uniform luminosity used to determine distance.






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






30. A star that has become a red giant for the second and final time. It is burning helium to carbon in a shell surrounding the core






31. When massive objects bend space and time enough to create multiple images of an object located behind them






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






33. Is space infinitely large?

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34. 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.






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






36. Mercury






37. A spherical shell of comets that orbit the sun at a great distance (roughly two light years from the sun)






38. VENUS






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






40. 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.






41. Ganymede






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






43. 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)






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






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






46. The study of the universe as a whole.






47. Collections of young - hot stars






48. 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)






49. Dark - reddish - low-pressure bands in Jupiter's atmosphere






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