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






2. The most mass a white dwarf can have before collapsing to a neutron star






3. 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.






4. The shadow area behind the Earth or Moon where the Sun is completely obscured.






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






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






7. Centered on the sun.






8. A term referring to Jupiter-like planets






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






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






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






12. The crust of a meteorite caused by its entry into Earth's atmosphere






13. A technique using computer-controlled mirrors to sharpen images distorted by the atmosphere






14. The imaginary sphere centered on the Earth that hols the stars.






15. Why do Galaxies move very rapidly in the interiors of the dense clusters?






16. Distribution of dust (tells us disk is thin) - find distances to O&B stars and H2 regions (arms are sights of star formation and OB stars live and die at location of birth) -Milky way has four arms. Sun is in spur apart from arms.






17. How is the Hubble Law consistent with an expanding universe?






18. The rock that makes up the lunar highlands






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






20. N=are*Fp(Ne)(Fl)(Fi)(Fc)(L) N: number of civilizations possible to communicate with are*: rate solar-like stars are created Fp: fraction of stars with planets Ne: number of planets like ours Fl: fraction of planets with life Fi: intelligent life Fc:






21. Any change in the speed or direction of an object's motion






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






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






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






25. When massive objects bend space and time enough to create multiple images of an object located behind them






26. The fusion process that turns three helium nuclei into a carbon nucleus






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






28. The average distance between the Earth and the Sun (=1.5 x10^8km)






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






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

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31. The science of measuring the apparent magnitudes of stars by imaging them through different filters.






32. The law that syas light energy from a blackbody increases as (temperature^4)






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






34. Radiation (possibly left over from the big bang) that fills the universe. Perfect black body spectrum and tells us a bit aout how galaxies are formed.






35. Clouds of low density gas often found glowing faintly on either side of an AGN.






36. 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






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






38. The rotation period of the Earth measured relative to the Sun.






39. Jupiter






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






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






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






43. Sa - Sb galaxies where two magnificent arms wind their way from nucleus out in a symmetrical manner.






44. A long-lived high-pressure bulge in Jupiter's southern hemisphere






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






46. A planet orbiting about a distant star






47. 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)






48. Relativity predicts that nothing can travel faster than the speed of light in a vacuum - How can it move slower?






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






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