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. Stars fromt he Halo that have drifted into the disk. as earth zooms past them in a faster orbit they appear to be going backward very fast






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






3. 30AU to 50Au from sun - consists of ancietn premordial objects made of frozen ice and dust-35000 objects or more that are larger than 100 km in diameter and many more smaller than this






4. The light produced when particles from the sun collide with atmospheric molecules






5. The universe is isotropic - homogeneous - and without beginning or end in time and space. If the universe is truly homogeneous then every line of sight will eventually end on a galaxy. If it has existed forever then there has been enough time for lig

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6. Mercury and venus






7. The opaque universe that existed for 300000 years after the Big Bang. (photons outnumbered nuclei by 1 billion to one - so less light)






8. Is space infinitely large?

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9. Is there water on the moon?






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






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






12. A push or a pull






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






14. What are the three possible geometries of the universe?






15. Mercury






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






17. The state of having a balance between inward and outard pressures in a gas--the inward force from gravity is balanced by the outward force from heat.






18. A spinning neutron star






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






20. Stars orvits do not define the spiral patterns - instead they are density waves that move at slower speeds (arms are defined by young O and B stars and gas clouds)






21. The ratio of the actual density of the universe to the critical density. (actual density divided by the critical density






22. VENUS






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






24. 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.






25. Jupiter






26. The process of acquiring material






27. Jupiter






28. The distance between a lens and its focal plane






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






30. 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.






31. How did Earth come to have an oxygen rich atmosphere?






32. 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)






33. The location in the Milky Way where stars orbit like a solid wheel






34. When a planet lines up with the sun inthe sky






35. Wave- only waves cause an interference pattern when passing through a double slit - particle- only particles deposit energy at specific locations (the way an image builds up on digital camera)






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






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






38. 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






39. When one side of a body always faces the planet it revolves around






40. The apparent backward motion of a planet against the background of stars.






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






42. The law that predicts the possible types of spectra.

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






44. 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






45. Formed rapidly - collapsed slower into disk shape - star birth rate is low but lasts longer and ongoing - contain higher mass blue stars.






46. In an OPEN UNIVERSE - the curvature of space-time is ____ - Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is____.






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






48. A perfect absorber and radiator of electromagnetic radiation.






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






50. Originially thought to be stars emitting radio radiation but are now concluded to be nuclei of distant galaxies (same as radio galaxies aka emit streams of material)






Can you answer 50 questions in 15 minutes?



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