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






2. Stars orvits do not define the spiral patterns - instead they are density waves that move at slower speeds (arms are defined by young O and B stars and gas clouds)






3. A term referring to Earth-like planets






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






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






6. A word meaning 'the same in all directions.'






7. The rock that makes up the lunar highlands






8. Saturn






9. The mass of an object divided by its volume






10. A particle of light






11. A nearby galaxy with a quasar-like nucleus. closer but less bright than quasars-weaker






12. Elliptical orbits that come inside orbit of the Earth.






13. A star fusing hydrogen to helium in it's core






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






15. The point where an inferior planet is as far away from the sun as it can be (as seen from the Earth)






16. 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.






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






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






19. A term referring to the orbital character of stars near the Sun






20. A star that blows itself apart






21. The rate of expansion of the universe.






22. Medium bulge - moderately would arms - arms have H2 regions in them and look sort of lumpy






23. 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)






24. Medium bulge - moderately would arms - arms have H2 regions in them and look sort of lumpy






25. Radiation emitted when charged particles spiral rapidly in a magnetic field. come off of jets from black holes.






26. What is the universe expanding into?






27. Population 1 with higher metals and contain many young stars in star clusters. Distribution of stars is everywhere in disk (arms only have 5% more stars)






28. A distance measure determined by the shifting of a star against the background sky every 6 months.






29. Moon in less than the angular diameter of the Sun.






30. 10^2 nm 10^7 nm






31. When a planet lines up with the sun inthe sky






32. When particles are compressed to an unnatural state where their pressure is not related to their temperature






33. A very dense - highly populated cluster of galaxies






34. A particle of light.






35. When the Moon entirely blocks the Sun.






36. 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






37. A very low mass particle formed in solar fusion reactions that reacts only weakly with matter






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






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






40. Originially thought to be stars emitting radio radiation but are now concluded to be nuclei of distant galaxies (same as radio galaxies aka emit streams of material)






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






42. The rotation of a star or planet at different speeds at its equator and poles






43. A small spherical dark nebula






44. A galaxy emitting large amounts of energy at long wavelengths.






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






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






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






48. A change in the wavelength of light caused by a motion between the observer and light (or wave) source (blue shift if getting closer - red shift if moving away)






49. The faint glow of light left over from the Big Bang. cosmic microwave background are the photons that remain after the big bang that have not turned into matter.






50. Infinitely long -> 10 cm







Sorry!:) No result found.

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