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. Ganymede and Titan






2. A very distant - star-like object with huge - broad emission lines. Probably the nucleus of a distant active galaxy.






3. The place in the sky that the Earth's axis points toward (can be either north or south)






4. In a FLAT UNIVERSE(our universe) - the curvature of space-time is ________. Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is _____.






5. Saying that the sky should not get dark at night because all lines of sight end on a star meaning that the night sky should be ablaze BUT the big bang - because the universe had a beginning - says that the sky gets dark because out in space - galaxie

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






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






8. The distance between a lens and its focal plane






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






10. A perfect absorber and radiator of electromagnetic radiation.






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






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






13. The entity responsible for spiral arms in grand-design spiral galaxies






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






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






16. The instant of time after the Big Bang when space and time obtained their characteristics. (t=10^-43 sec when gravity freezes out-instant when gravity started existing as a separate force)






17. A particle of light.






18. 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)






19. Matter that reveals itself only through its gravitational attraction






20. The final end state of a high mass star. .An entity for which gravity has completely overwhelmed all other forces of nature.






21. Mercury and venus






22. 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.






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






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






25. The oldest part of the Milky Way






26. 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.






27. 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






28. The particle horizon is the farthest we can see. It exists because the universe had a beginning and thus a definite age. Light from distances farther away from the particle horizon have not had time to reach us yet.






29. The rock that makes up the lunar maria






30. 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.






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






32. 10 cm -> 1 mm






33. The gap etween saturn's A and B rings






34. 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.






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






36. A star that erratically and explosively brightens and dims






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






38. The layer of the sun just above the photosphere






39. When the Sun is farthest north of the celestial equator (about June 22)






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






41. A collection of galaxies like the one the Milky Way belongs to






42. 1μm 100 nm






43. Europa






44. The mix of pure photon energy that emerged at the start of the universe.






45. Saturn






46. A large and bright but cool star.






47. The state of having a balance between inflowing and outflowing heat-- the temp at every radial point is different but constant






48. A collection of comets in the plane of the solar system - located beyond the orbit of Pluto






49. Ganymede






50. 10 nm 10^2 nm







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Can you answer 50 questions in 15 minutes?


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