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 lens in a telescope used to determine the magnification






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






3. Dark areas on the sun that are cooler than the surrounding photosphere






4. In a CLOSED UNIVERSE - the curvature of space-time is _________. Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is _____.






5. A highly variable galaxy nucleus of which BL Lac is one. Their light is highly energetic and their spectra are featureless. (face on)






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






7. 100 nm 10 nm






8. A younger cluster of stars - found in the galaxy disk






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






10. A streak of light in the atmosphere






11. Collections of young - hot stars






12. A bright area of higher temperature that often proceeds the formation of sunspots.






13. The powdered stone fragments that make up the lunar 'soil'






14. 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






15. When particles are compressed to an unnatural state where their pressure is not related to their temperature






16. A subatomic particle with a negative charge. It creates light.






17. Extremely round - lots of liquid water - ice rafts on surface ACTIVE SURFACE






18. The name for the only seriously considered theory of the universe.






19. Venus






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






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






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






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






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






25. When the Sun moves from south to north across the celestial equator (about March 21)






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






27. 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






28. The process of acquiring material






29. Hot cells of gas that rise and fall in the hotosphere






30. The lens that gathers the light in a refractor






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






32. In Ptolemy's geocentric solar system - the small circle on which a planet moved.






33. 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:






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






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






36. A measure of how an object resists accelerating when acted upon by a force. It is proportional the amount of matter in an object






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






38. A term referring to Jupiter-like planets






39. Half of the longest diameter across an ellipse






40. A star without enough mass to begin hydrogen fusion






41. A word meaning 'the same in all directions.'






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






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






44. An object that may remain after a star explodes






45. The apparent magnitude a star would have if it were at a distance of 10 parsecs.






46. 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






47. The location of a supermassive black hole






48. 1 mm 1μm






49. Population 1- similar to the sun and 2% of elements are metal - Population 2- formed before gas was metal- only a fraction of mass is metal.






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