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 gap etween saturn's A and B rings






2. The high- temperatature outer layer of the sun






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






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






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






6. Formed from slow rotating clouds - collapsed quicker - initial star formation rate is high but died out - older - little rotation - look redder






7. The north-south line passing directly overhead through the zenith.






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






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






10. Centered on the sun.






11. IO






12. A small round distribution of gas surrounding a dying star






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






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






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






16. A measure of the force of gravity on an object






17. A star without enough mass to begin hydrogen fusion






18. Earth






19. IO






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






21. Arcs of increased mass concentration that slow stars and gas down as they orbit through which cause the formation of stars.






22. The Greek philosopher responsible for making the stellar magnitude scale.






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






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






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






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






27. 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.






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






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






30. Mercury - Venus - Earth - Mars






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






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






33. A measure of the force of gravity on an object






34. In an OPEN UNIVERSE - the curvature of space-time is ____ - Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is____.






35. A very dense - highly populated cluster of galaxies






36. 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






37. A small and dim but hot star.






38. The light produced when particles from the sun collide with atmospheric molecules






39. 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






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






41. The law that syas light energy from a blackbody increases as (temperature^4)






42. The rotation period of the Earth measured relative to the stars.






43. A fusion process in which a carbon atom transmutes to oxygen and back - creating a helium atom in the process






44. The apparent magnitude a star would have if it were at a distance of 10 parsecs.






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






46. Form honeycomb like patterns surrounding empty or nearly empty voids.






47. 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 ________.






48. The oldest part of the Milky Way






49. Thick rigid crust - no longer has plate tectonics but still has convective hot spots that create earth-like volcanoes except that last for billions of years because of lack of tectonics.






50. After stars form they pump light energy into surrounding gas causing it to heat up and glow (H2=ionized hydrogen - H1= neutral hydrogen in molcular couds)