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. A small spherical dark nebula






2. How did Earth come to have an oxygen rich atmosphere?






3. A continuous spectrum of light missing energy at a few wave lengths.






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






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






6. The area behind a lens where images are resolved






7. The process similar to conduction by which energy moves from the solar core to the convective layer






8. Large nebula consisting of very cold gas and dust






9. The number of protons in an atom.






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






11. The surface of the sun






12. The material from which the solar system formed






13. The era when the ratio of matter to energy greatly favored matter. (verses radiation dominated universe where it was opaque. Matter is now dominated by gravity not photons)






14. Titan






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






16. A fusion process in which protons build together to form helium






17. 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






18. 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.






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






20. A spectrum of light with energy at only a few wavelengths.






21. Saturn






22. Centered on the Earth






23. Jupiter






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






25. A push or a pull






26. Matter so dense that even light cannot escape its gravity






27. A planet that is closer to the sun than the earth






28. The force of attraction between any two objects having mass






29. A method of finding a star's distance from its absolute magnitude and spectral type or color.






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






31. The lens in a telescope used to determine the magnification






32. The oldest part of the Milky Way






33. The time when the universe cooled sufficiently for atoms to exist. radiation dominated= first 300000 years - THEN era of recombination turns into matter dominated for next.






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






35. The linear correlation between the rate of the expansion of the universe and distance. Says that as galaxies get farther away in space - the speed with which they recede from us increases. So we can measure the amount of recessional velocity and use






36. Loops that trace the magnetic field as it erupts from a sunspot area and arches over to an adjacent area. They glow in the light of gas pouring out of corona and falling into photosphere.






37. Jupiter






38. Light-flaky crust - convective currents cause it to wrinkle and bunch (1/5 of surface). uniform cratering suggests lack of weathering and tectonics. volcanoes are flat due to atmospheric pressure.






39. Matter that reveals itself only through its gravitational attraction






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






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






43. The location around an atom where an electron resides.






44. The rate of expansion of the universe.






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






46. The assumption that the universe is isotropic (same in all directions) and homogeneous (Same everywhere throughout)






47. Plate tectonics due to thickness of crust and maintain their general form when they collide-where most volcanoes are.






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






49. The process that powers the sun and hydrogen bombs






50. The linear correlation between the rate of the expansion of the universe and distance. Says that as galaxies get farther away in space - the speed with which they recede from us increases. So we can measure the amount of recessional velocity and use