Test your basic knowledge |

Subject : science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. In Ptolemy's geocentric solar system - the large circle on which a planet's epicycle moved around the Earth.






2. Ganymede and Titan






3. The layer of the sun just above the photosphere






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






5. The sinking of denser elements to the center of a young molten planet






6. Hot cells of gas that rise and fall in the hotosphere






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






8. The entity from which the whole universe is postulated to have come from.






9. The point in its orbit where a planet is farthest from the sun






10. 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)






11. An element of a highly efficient - two-dimensional electronic light detector






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






13. The line on an H-are diagram going from upper left to lower right where normal stars of different masses reside.






14. What is the universe expanding into?






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






16. A galaxy sending out a stream of material from its nucleus






17. Stars fromt he Halo that have drifted into the disk. as earth zooms past them in a faster orbit they appear to be going backward very fast






18. Large bulge - tightly wound spiral arms - relatively few h2 regions and are smooth






19. The law that describes the blackbody curve - and let to quantum mechanics.

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20. The final end state of an intermediate to high mass star. An entity in which all the electrons have been pushed into the protons.






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






22. 30AU to 50Au from sun - consists of ancietn premordial objects made of frozen ice and dust-35000 objects or more that are larger than 100 km in diameter and many more smaller than this






23. Venus






24. The point where a superior planet is as far away from the sun as it can be (as seen from the Earth)






25. A method of finding a star's distance from its absolute magnitude and spectral type or color.






26. As open clusters age - they push gas away but dust remains this can reflect light giving the cluster a blue-ish color. also called reflection nebula






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






28. The process of acquiring material






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






30. Population 1- similar to the sun and 2% of elements are metal - Population 2- formed before gas was metal- only a fraction of mass is metal.






31. A distance measure determined by the shifting of a star against the background sky every 6 months.






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






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






34. Cold aggregates of gas - large and contain a huge amount of matter - so cold that molecules stick together to form molecules.






35. The entity responsible for spiral arms in grand-design spiral galaxies






36. VENUS






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






38. A nearby galaxy with a quasar-like nucleus. closer but less bright than quasars-weaker






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






40. A phenomenon seen when the Earth passes through the orbit of a burned out comet






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






42. If stars have diff orbital periods - than any arms formed by stars will wind into a tight spiral pattern (billion yrs or so)






43. How did Earth come to have an oxygen rich atmosphere?






44. 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.






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






46. Finding a star's absolute magnitude from it's placement on an HR diagram. After finding the absolute magnitude - we measure the apparent magnitude - for a distance modulus and use this to find the distance. This method is good for finding distances t






47. A star that erratically and explosively brightens and dims






48. Large bulge - tightly wound spiral arms - relatively few h2 regions and are smooth






49. A nearby galaxy with a quasar-like nucleus. closer but less bright than quasars-weaker






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