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. A perfect absorber and radiator of electromagnetic radiation.






2. The particle horizon is the farthest we can see. It exists because the universe had a beginning and thus a definite age. Light from distances farther away from the particle horizon have not had time to reach us yet.






3. A huge sphere of tenuous gas surrounding the nucleus of a comet






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






5. The seasonal shifting of a nearby star's position relative to more distant objects.






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






7. 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.






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






9. The projection of the Earth's equator onto the celestial sphere.






10. 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






11. A very low mass particle formed in solar fusion reactions that reacts only weakly with matter






12. A bridge of material held in position above the solar surface. They can remain for hours even days






13. In a FLAT UNIVERSE(our universe) - the curvature of space-time is ________. Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is _____.






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






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






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






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






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






19. Mercury






20. The line on an H-are diagram going from upper left to lower right where normal stars of different masses reside.






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






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






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






24. A telescope that uses lenses to focus light






25. A point in the sky where meteors appear to come from during a shower






26. Sc galaxies






27. A telescope that uses lenses to focus light






28. The rate of expansion of the universe.






29. A change in the wavelength of light caused by a motion between the observer and light (or wave) source (blue shift if getting closer - red shift if moving away)






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






31. Earth






32. The process of acquiring material






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






34. Where is the center of the expansion






35. The organized effort to find life elsewhere in the universe. (Search for Extra-Terrestrial Intelligence)






36. The class of all objects having high energy radiation coming from their nuclei. Active Galactic Nucleus- Blazars - Quasars - Radio and Emit synchrotron radiation






37. 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






38. Half of the longest diameter across an ellipse






39. The rock that makes up the lunar highlands






40. The elementary building blocks from which protons and neutrons are formed.






41. 10^2 nm 10^7 nm






42. The projection of the Earth's equator onto the celestial sphere.






43. IO






44. A star that blows itself apart






45. Elliptical orbits that come inside orbit of the Earth.






46. A small round distribution of gas surrounding a dying star






47. A cool collection of gas and dust silhouetted against a brighter background of stars and/or gas






48. The 'edge' of the universe. Light beyond this has not reached us yet.






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






50. 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)