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 of a supermassive black hole






2. 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.






3. 10 cm -> 1 mm






4. 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.






5. Atmosphere blocks high energy wavelengths - atmosphere blurs optical radiation - atmosphere absorbs some radiation at all wavelengths even when it gets through.






6. Large nebula consisting of very cold gas and dust






7. The number of protons in an atom.






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






9. The science of measuring the apparent magnitudes of stars by imaging them through different filters.






10. Places in the asteroid belt - caused by resonance with Jupiter - where there are no asteroids






11. A particle of light.






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






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






14. An evolved star - past the helium flash that is burning helium to carbon in it's cores






15. What is the universe expanding into?






16. Mercury - Venus - Earth - Mars






17. Saturn






18. The north-south line passing directly overhead through the zenith.






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






20. Galaxies whose nuclei emit jets of materil at high speeds. material comes from supermassive black holes






21. N=are*Fp(Ne)(Fl)(Fi)(Fc)(L) N: number of civilizations possible to communicate with are*: rate solar-like stars are created Fp: fraction of stars with planets Ne: number of planets like ours Fl: fraction of planets with life Fi: intelligent life Fc:






22. A telescope that uses mirrors to focus light






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






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






25. The rotation period of the Earth measured relative to the Sun.






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






27. The final end state of an intermediate to high mass star. An entity in which all the electrons have been pushed into the protons.






28. The larger bodies that formed early in teh solar nebula that were chemically differentiated






29. A phenomenon seen when the Earth passes through the orbit of a burned out comet






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






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






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






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






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






35. The point directly overhead.






36. Is there water on the moon?






37. What is the universe expanding into?






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






39. 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






40. Venus (retrograde)






41. The process that powers the sun and hydrogen bombs






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






43. The lens that gathers the light in a refractor






44. The distance light travels in one year (=9.46x10^12km).






45. 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






46. 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)






47. 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)






48. The point where a superior planet is as far away from the sun as it can be (as seen from the Earth)






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






50. An empirical scheme for predictin ghe orbital distances of planets