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. IO






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






3. Neptune or uranus






4. A repeated - periodic push or pull capable of summing into a larger push or pull






5. A star without enough mass to begin hydrogen fusion






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






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






8. Jupiter






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






10. All wavelengths of light emitted by a blackbody.






11. Distance from sun to nucleus- 8 kiloparsecs (26000 LY) - diameter of Milky way- 150000 LY - length for sun to orbit once around milky way- 250 million years






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






13. The name for the only seriously considered theory of the universe.






14. The linear correlation between the rate of the expansion of the universe and distance. Says that as galaxies get farther away in space - the speed with which they recede from us increases. So we can measure the amount of recessional velocity and use






15. Massive compact halo objects (MACHO) - weakly interacting massive particles (WIMPY's)






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






17. 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.






18. Long - meandering cliff formed when a planet surface cools and shrinks






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






20. Ancient stream channels - flood planes - and sedimentary-type rock. Frozen water is found in the polar ice caps and in the soil.






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






22. 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.






23. Half of the longest diameter across an ellipse






24. The dark - relativley smooth areas on the moon; Latin for sea






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

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






27. The slow wobble of the Earth on its rotation axis.






28. A word meaning 'the same in all directions.'






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






30. A telescope that uses mirrors to focus light






31. VENUS






32. Mercury






33. Largest moon in solar system - two differenet types of terrain - darker terrain is older - NOT ACTIVE SURFACE






34. The relation that tells how light dims with distance.






35. Material that shoots rapidly out into space. Flares cause Auroras






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






37. Electromagnetic Radiation






38. The rock that makes up the lunar maria






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






40. Rich= dense crowded cores of galaxies - poor= few members and a looser organization of galaxies






41. The projection of the Earth's equator onto the celestial sphere.






42. Titan






43. Approximate speed of light in a vacuum






44. The movement of the Earth's crustal plates riding on top of the mantle.






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






46. A perfect absorber and radiator of electromagnetic radiation.






47. Where is the center of the expansion






48. The instant of time after the Big Bang when space and time obtained their characteristics. (t=10^-43 sec when gravity freezes out-instant when gravity started existing as a separate force)






49. The state of having a balance between inward and outard pressures in a gas--the inward force from gravity is balanced by the outward force from heat.






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