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. Any class of objects with a uniform luminosity used to determine distance.






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






3. Half of the longest diameter across an ellipse






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






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






6. All wavelengths of light emitted by a blackbody.






7. 1 mm 1μm






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






9. The surface of the sun






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






11. A representation of the changes in color and brightness of an evolving protostar.






12. Saying that the sky should not get dark at night because all lines of sight end on a star meaning that the night sky should be ablaze BUT the big bang - because the universe had a beginning - says that the sky gets dark because out in space - galaxie

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13. Distribution of dust (tells us disk is thin) - find distances to O&B stars and H2 regions (arms are sights of star formation and OB stars live and die at location of birth) -Milky way has four arms. Sun is in spur apart from arms.






14. A two-filter measure of the color - and hence temperature - of a star.






15. Light scattered through the atmosphere that degrades astronomical images






16. 10 nm 10^2 nm






17. A push or a pull






18. 10 nm 10^2 nm






19. A small spherical dark nebula






20. Saturn






21. A small and dim but hot star.






22. The shadow behind the Earth or Moon where the Sun is partially obscured.






23. Infinitely long -> 10 cm






24. The lens that gathers the light in a refractor






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






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






27. 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)






28. A toroidal or donut-shaped collection of material attracted to a central body like a star or black hole. Dust around an object






29. The telescope configuration that has the focus placed at the back of the primary mirror






30. The imaginary sphere centered on the Earth that hols the stars.






31. Latin for 'cloud'. A word used to describe the collections of gas and dust in the Milky Way and other galaxies






32. 1. We see rapid movements or high energy radiation coming at some level from the nuclei of nearly every galaxy we have looked at. 2. We suspect that the creation of these supermassive black holes is part of the galaxy formation process.






33. Any change in the speed or direction of an object's motion






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






35. A streak of light in the atmosphere






36. Material that shoots rapidly out into space. Flares cause Auroras






37. A force exerted by reflecting sunlight






38. A galaxy sending out a stream of material from its nucleus






39. Mercury - Venus - Earth - Mars






40. The point where an inferior planet is as far away from the sun as it can be (as seen from the Earth)






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






42. The slow wobble of the Earth on its rotation axis.






43. Earth






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






45. A cloud of ionized hydrogen. Formed when young stars heat the surrounding gas






46. Mercury and venus






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






48. An object that may remain after a star explodes






49. The assumption that the universe is isotropic (same in all directions) and homogeneous (Same everywhere throughout)






50. The science of measuring light energy by wavelength.