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 apparent backward motion of a planet against the background of stars.






2. Distance from sun to nucleus- 8 kiloparsecs (26000 LY) - diameter of Milky way- 150000 LY - length for sun to orbit once around milky way- 250 million years






3. The entity from which the whole universe is postulated to have come from.






4. Mercury






5. The layer of the sun just above the photosphere






6. A quantity measuring the stability of the Earth's atmosphere






7. Mercury - Venus - Earth - Mars






8. The organization of clusters of galaxies into sheets and strings






9. Is space infinitely large?

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






11. An entity that is likely in the nucleus of most - if not all - galaxies.






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






13. The trapping of heat by carbon dioxide or other gases in the Earth's atmosphere.






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






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






16. 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.






17. A telescope that uses mirrors to focus light






18. When one side of a body always faces the planet it revolves around






19. A volume of space where few - if any - galaxies are located






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






21. The act of removing an electron from an atom.






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






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






24. Radiation (possibly left over from the big bang) that fills the universe. Perfect black body spectrum and tells us a bit aout how galaxies are formed.






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






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






27. A particle of light






28. What Ole Roemer used to measure the speed of light in a vacuum






29. The lowest energy of an atom.






30. Clouds of low density gas often found glowing faintly on either side of an AGN.






31. The movement of the Earth's crustal plates riding on top of the mantle.






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






33. The point in its orbit where a planet is farthest from the sun






34. Cold aggregates of gas - large and contain a huge amount of matter - so cold that molecules stick together to form molecules.






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






36. Orbit in Jupiters orbit






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






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






39. 1 mm 1μm






40. A word used in astronomy to describe all elements besides hydrogen and helium






41. 10 nm 10^2 nm






42. In what chemical form are jupiters nitrogen - carbon and oxygen?






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






44. Why do Galaxies move very rapidly in the interiors of the dense clusters?






45. Titan






46. 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






47. The 11 or 22 period on the sun durin which sunspots increase - decrease - change polarity - increase and decrease again.






48. Flattened spherical distribution of old stars with some young stars too. 'hub' of Milky way - stars orbit with solid body speeds. Elongated into bar shape






49. Neptune or uranus






50. The point directly overhead.