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






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






3. The material from which the solar system formed






4. 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






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






6. The Greek philosopher responsible for making the stellar magnitude scale.






7. 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.






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






9. A rock or iron specimen that has fallen from space






10. The place in the sky that the Earth's axis points toward (can be either north or south)






11. A star that blows itself apart






12. Approximate speed of light in a vacuum






13. Moon in less than the angular diameter of the Sun.






14. Half of the longest diameter across an ellipse






15. An energetic event taking place in the early universe






16. A plot of star absolute magnitude verses spectral type.






17. The fate of the universe if it is closed. The universe expanding as much as possible and then retracting






18. Disk dust grains are made of all the elements that are not in gaseous form in space which blocks starlight and causes interstellar extinction






19. The average distance between the Earth and the Sun (=1.5 x10^8km)






20. Milky way galaxy is a member - a small poor cluster-about 30 galaxies






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






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






23. Population 1 with higher metals and contain many young stars in star clusters. Distribution of stars is everywhere in disk (arms only have 5% more stars)






24. A star that has become a red giant for the second and final time. It is burning helium to carbon in a shell surrounding the core






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






26. The location of a supermassive black hole






27. Light scattered through the atmosphere that degrades astronomical images






28. A very distant - star-like object with huge - broad emission lines. Probably the nucleus of a distant active galaxy.






29. The part of the Milky way that has on-going star formation






30. Old - pock marked - icy surface - interior is not differentiated - geologically dead - NOT ACTIVE SURFACE






31. A planet orbiting about a distant star






32. A method of finding a star's distance from its absolute magnitude and spectral type or color.






33. 10 cm -> 1 mm






34. A logarithmically scaled value for the measured brightness of a star.






35. Form honeycomb like patterns surrounding empty or nearly empty voids.






36. The law that describes the blackbody curve - and let to quantum mechanics.

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37. Small bulges - loosely wound - massive arms - arms have many H2 regions and look very lumpy






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






39. The nuclei of very distant galaxies. Likely a manifestation of supermassive black holes






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






41. An element of a highly efficient - two-dimensional electronic light detector






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






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






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






45. Dying large-mass stars lose their outer layers in a violent explosion creating large - chaotic remnants. these brighten like nova but are so much brighter and only occur ONCE PER STAR






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






47. The process that powers the sun and hydrogen bombs






48. IO






49. A planet that is farther from the sun than the Earth is






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