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 location in an H-are diagram of a star cluster - where stars have just left the main sequence. Used to estimate the cluster age.






2. 1 mm 1μm






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






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






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






6. 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)






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






8. Highlands: rocks are made of lighter anorthosite (similar to old earth rocks) Maria: rocks made of heavy mare basalt (volcanic rock) everywhere else is loose regolith created by meteoric impact.






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






10. The layer of the sun just above the photosphere






11. Mercury and venus






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






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






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






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






16. 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.






17. Sudden blasts of gamma radiation from a very distant galaxy caused possibly by a supernova explosion.






18. VENUS






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






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






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






22. The powdered stone fragments that make up the lunar 'soil'






23. A force exerted by reflecting sunlight






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






25. Where is the center of the expansion






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






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






28. The high- temperatature outer layer of the sun






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






30. The number of protons in an atom.






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






32. The amount of density needed to stop the universe from expanding and to begin the big crunch represented by Pc






33. The mirror that determines the focus configuration of a reflector






34. What do we think the actual fate of the universe will be and why do we think this?






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






36. A planet that is farther from the sun than the Earth is






37. A small chunk of rock in space






38. The 'edge' of the universe. Light beyond this has not reached us yet.






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






40. The elementary building blocks from which protons and neutrons are formed.






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






42. A star that blows itself apart






43. Is space infinitely large?

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44. The first rock-sized bodies that formed in the solar nebula from dust grains






45. The cosmological principle is the assumption that the universe is isotropic and homogeneous.The Big Bang assumes it to be a correct principle so that what we observe is exactly like What is too far away to be observed.






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






47. The location in the Milky Way where stars orbit like a solid wheel






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






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






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