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. Europa






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






3. The state of having a balance between inflowing and outflowing heat-- the temp at every radial point is different but constant






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






5. The location around an atom where an electron resides.






6. 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






7. A spread of light with an uninterrupted wavelength distribution of energy.






8. Small moons that maintain the shape of rings around Saturn and Uranus






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






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






11. Titan






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






13. Plate tectonics due to thickness of crust and maintain their general form when they collide-where most volcanoes are.






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






15. A change in the appearance of the sun at the edge of the solar disk






16. A telescope that uses mirrors to focus light






17. A representation of the changes in color and brightness of an evolving protostar.






18. Is space infinitely large?

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19. Sudden blasts of gamma radiation from a very distant galaxy caused possibly by a supernova explosion.






20. The area behind a lens where images are resolved






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






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






23. 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






24. The telescope configuration that has the focus placed at the back of the primary mirror






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






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






27. 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.






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






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






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






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






32. The number of protons in an atom.






33. The first rock-sized bodies that formed in the solar nebula from dust grains






34. A measure of the ability of a telescope to see fine detail






35. The normal eastward movement of a planet against the background of hte distant stars.






36. Large nebula consisting of very cold gas and dust






37. In Ptolemy's geocentric solar system - the large circle on which a planet's epicycle moved around the Earth.






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






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






40. Neptune or uranus






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






42. The mirror that gathers the light in a reflector






43. 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.






44. A star that blows itself apart






45. Consists of old red stars in slow orbits that plunge through disk and bulge. about 1% are old - round globular clusters.






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






47. An object that may remain after a star explodes






48. The mirror that gathers the light in a reflector






49. 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






50. A logarithmically scaled value for the measured brightness of a star.