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. 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 _____.






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






3. The shadow area behind the Earth or Moon where the Sun is completely obscured.






4. When the Sun is farthest south of the celestial equator (About December 22)






5. Mercury






6. 100 nm 10 nm






7. Venus (retrograde)






8. What is the universe expanding into?






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






10. The mass of an object divided by its volume






11. Latin for 'cloud'. A word used to describe the collections of gas and dust in the Milky Way and other galaxies






12. The state of having a balance between inward and outard pressures in a gas--the inward force from gravity is balanced by the outward force from heat.






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






14. Radiation given off by electrons accelerating in a magnetic field






15. A measure of the ability of a telescope to see fine detail






16. The ratio of the actual density of the universe to the critical density. (actual density divided by the critical density






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






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






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






20. Mercury - Venus - Earth - Mars






21. A cool collection of gas and dust silhouetted against a brighter background of stars and/or gas






22. An object that may remain after a star explodes






23. All possible types of energy that can be emitted and absorbed by atoms.






24. Long - meandering cliff formed when a planet surface cools and shrinks






25. Mercury






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. Formed from slow rotating clouds - collapsed quicker - initial star formation rate is high but died out - older - little rotation - look redder






28. Why does the earth have few craters while the moon has many?






29. Large bulge - tightly wound spiral arms - relatively few h2 regions and are smooth






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






31. Saturn






32. All possible types of energy that can be emitted and absorbed by atoms.






33. 10^2 nm 10^7 nm






34. Venus (retrograde)






35. Small compact stars called white dwarfs can have material deposited on their surfaces. In time material heats up and explodes in surface nuclear reaction- star brightens - settles - repeats.






36. Matter that reveals itself only through its gravitational attraction.






37. 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.






38. All wavelengths of light emitted by a blackbody.






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






40. Flat disk with gas - dust - H2 regions - molecular clouds - dust young stars and remnants of old planetary nebula and supernova remnants. stars spin together with similar velocities called differential rotation






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






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






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






44. 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.






45. A particle of light.






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






47. 1μm 100 nm






48. Ganymede and Titan






49. A repeated - periodic push or pull capable of summing into a larger push or pull






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