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






2. 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.






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






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






5. 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:






6. A small spherical dark nebula






7. Atmosphere blocks high energy wavelengths - atmosphere blurs optical radiation - atmosphere absorbs some radiation at all wavelengths even when it gets through.






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






9. A measure of the seasonal shifting of a star's position against farther stars or galaxies. The closer the star - the greater is the angular distance it shifts. We use it to find distances to stars that are up to 1000 pc away.






10. A faint - remarkably uniform distribution of radiation in space






11. Earth






12. The mass of an object divided by its volume






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






14. The number of protons in an atom.






15. A star that erratically and explosively brightens and dims






16. Either Io -Europa - Ganymede - or Callisto






17. What causes the zones and belts on jupiter and saturn?






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






19. A word used in astronomy to describe all elements besides hydrogen and helium






20. IO






21. 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.






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






23. Mercury






24. Finding a star's absolute magnitude from it's placement on an HR diagram. After finding the absolute magnitude - we measure the apparent magnitude - for a distance modulus and use this to find the distance. This method is good for finding distances t






25. 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)






26. The light produced when particles from the sun collide with atmospheric molecules






27. 1μm 100 nm






28. The point directly overhead.






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






30. 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)






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






32. Is there water on the moon?






33. The process that powers the sun and hydrogen bombs






34. Is there water on the moon?






35. A star that is burning hydrogen to helium in a shell surrounding it's core






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






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






38. A point in the sky where meteors appear to come from during a shower






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






40. The family of radiant energy that includes light as a subset






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






42. The gap inthe outer portion of Saturn's A ring






43. A star without enough mass to begin hydrogen fusion






44. Milky way galaxy is a member - a small poor cluster-about 30 galaxies






45. A particle of light.






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






47. 10^2 nm 10^7 nm






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






49. 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)






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