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. Light-flaky crust - convective currents cause it to wrinkle and bunch (1/5 of surface). uniform cratering suggests lack of weathering and tectonics. volcanoes are flat due to atmospheric pressure.






2. Mercury






3. A toroidal or donut-shaped collection of material attracted to a central body like a star or black hole. Dust around an object






4. A large - irregularly shaped rocky object orbiting the sun mostly between mars and jupiter. Left-over planetesimals






5. 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.






6. The 11 or 22 period on the sun durin which sunspots increase - decrease - change polarity - increase and decrease again.






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






8. All possible types of energy that can be emitted and absorbed by atoms.






9. When the Sun moves from south to north across the celestial equator (about March 21)






10. A subatomic particle with a negative charge. It creates light.






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






12. A huge sphere of tenuous gas surrounding the nucleus of a comet






13. Electromagnetic Radiation






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






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






16. Ganymede






17. Small compact stars called white dwarfs can have material deposited on their surfaces. In time material heats up and explodes in surface nuclear reaction- star brightens - settles - repeats.






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






19. A spherical shell of comets that orbit the sun at a great distance (roughly two light years from the sun)






20. Then the Sun moves from north to south across the celestial equator (about September 23)






21. The law stating that hotter blackbodies look bluer than cooler blackbodies.

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22. A spinning neutron star






23. Hydrogen and helium (mainly)






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






25. The layer of the sun just above the photosphere






26. Radiation given off by electrons accelerating in a magnetic field






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






28. First accurately measured the speed of light in a vacuum






29. IO






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






31. What are the three possible geometries of the universe?






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






33. 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.






34. 1-orbit aroudn the sun 2- are in hydrostatic equilibrium and 'mostly round' 3- have not cleared debris around its orbit 4- are not satellites






35. The mirror that gathers the light in a reflector






36. A star that blows itself apart






37. Titan






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






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






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






41. An energetic event taking place in the early universe






42. The lens in a telescope used to determine the magnification






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






44. Earth






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






46. The source of the force that is accelerating the expansion rate of the universe.






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






48. Why does the earth have few craters while the moon has many?






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






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