Test your basic knowledge |

Subject : science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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 fusion process that turns three helium nuclei into a carbon nucleus






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






3. A term referring to Jupiter-like planets






4. A word meaning 'the same everywhere throughout.'






5. 10 nm 10^2 nm






6. 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






7. A measure of how an object resists accelerating when acted upon by a force. It is proportional the amount of matter in an object






8. A cloud of ionized hydrogen. Formed when young stars heat the surrounding gas






9. 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






10. Wave- only waves cause an interference pattern when passing through a double slit - particle- only particles deposit energy at specific locations (the way an image builds up on digital camera)






11. A spinning neutron star






12. Young clusters in disk are irregularly shaped since they have no time to relax into the rounder relaxed shape of globular clusters-will constantly be torn apart and assimilated.






13. Centered on the sun.






14. 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.






15. Ganymede and Titan






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






17. In a CLOSED UNIVERSE - the curvature of space-time is _________. Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is _____.






18. All wavelengths of light emitted by a blackbody.






19. When the Moon entirely blocks the Sun.






20. 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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21. The location around an atom where an electron resides.






22. A younger cluster of stars - found in the galaxy disk






23. The number of protons in an atom.






24. Disk dust grains are made of all the elements that are not in gaseous form in space which blocks starlight and causes interstellar extinction






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






26. The equation that describes how matter equates with energy






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






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






29. Star speed at outer edge of galaxy should begin to diminish - but they dont so we guess that this means there is increasing force (aka dark matter)






30. Sc galaxies where star formation and destruction is so rapid that supernova explosions are mainly responsible for compressing gas to create new stars.






31. The number of protons in an atom.






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






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






34. Either Io -Europa - Ganymede - or Callisto






35. The fate of the universe if it is closed. The universe expanding as much as possible and then retracting






36. 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)






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






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






39. The act of removing an electron from an atom.






40. Jupiter






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






42. A cool collection of gas and dust silhouetted against a brighter background of stars and/or gas






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






44. A term referring to Earth-like planets






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






46. The particle horizon is the farthest we can see. It exists because the universe had a beginning and thus a definite age. Light from distances farther away from the particle horizon have not had time to reach us yet.






47. A bridge of material held in position above the solar surface. They can remain for hours even days






48. A massive variable star used to find distances to the galaxies or clusters that contain them.






49. The area behind a lens where images are resolved






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







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