Test your basic knowledge |

Subject : science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. 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.






2. In Ptolemy's geocentric solar system - the large circle on which a planet's epicycle moved around the Earth.






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






4. Collections of young - hot stars






5. The law that syas light energy from a blackbody increases as (temperature^4)






6. The point in its orbit where a planet is nearest the sun






7. VENUS






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






9. That which is responsible for Jupiter's magnetic field






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






11. Jupiter






12. Saturn






13. A star that is burning hydrogen to helium in a shell surrounding it's core






14. Sc galaxies where star formation and destruction is so rapid that supernova explosions are mainly responsible for compressing gas to create new stars.






15. A streak of light in the atmosphere






16. 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.






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






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






19. As open clusters age - they push gas away but dust remains this can reflect light giving the cluster a blue-ish color. also called reflection nebula






20. A star that blows itself apart






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






22. 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






23. Young clusters in disk are irregularly shaped since they have no time to relax into the rounder relaxed shape of globular clusters-will constantly be torn apart and assimilated.






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






25. Relativity predicts that nothing can travel faster than the speed of light in a vacuum - How can it move slower?






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






27. The Big Bang was not an explosion of matter into empty space - like the explosion of a bomb. Instead - it was an emergence of space and time filled with pure energy where before none of this was present. The point from which is emerged is called the






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






29. 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)






30. The material from which the solar system formed






31. A force exerted by reflecting sunlight






32. A term referring to the orbital character of stars near the Sun






33. A very dense - highly populated cluster of galaxies






34. The sinking of denser elements to the center of a young molten planet






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






36. Hydrogen and helium (mainly)






37. Rich= dense crowded cores of galaxies - poor= few members and a looser organization of galaxies






38. The high- temperatature outer layer of the sun






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






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






41. A spread of light with an uninterrupted wavelength distribution of energy.






42. A telescope that uses lenses to focus light






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






44. A force exerted by reflecting sunlight






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






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 apparent path of the Sun through the stars on the celestial sphere.






48. The rock that makes up the lunar maria






49. Mercury and venus






50. The faint glow of light left over from the Big Bang. cosmic microwave background are the photons that remain after the big bang that have not turned into matter.