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 movement of the Earth's crustal plates riding on top of the mantle.






2. 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)






3. Comglomerates of ice and rock that orbit the sun in highly elliptical paths






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






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






6. Jupiter






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






8. The process of acquiring material






9. The lowest energy of an atom.






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






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






12. Matter that reveals itself only through its gravitational attraction.






13. A star without enough mass to begin hydrogen fusion






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






15. Centered on the Earth






16. Heavier elements such as iron - silicon - magnesium - sulfer - nickel






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






18. A small chunk of rock in space






19. The first rock-sized bodies that formed in the solar nebula from dust grains






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






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






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






23. Europa






24. Light scattered through the atmosphere that degrades astronomical images






25. 1μm 100 nm






26. We can infer the absolute magnitude of pulsating variable stars by measuring their pulsation periods. The longer the pulsations - the greater their luminosities. We then again measure their apparent magnitudes - compare it with their absolute magnitu






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






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






29. The dark - relativley smooth areas on the moon; Latin for sea






30. When material is heated and moves taking the heat energy with it






31. 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.






32. A massive variable star used to find distances to the galaxies or clusters that contain them.






33. Highlands: rocks are made of lighter anorthosite (similar to old earth rocks) Maria: rocks made of heavy mare basalt (volcanic rock) everywhere else is loose regolith created by meteoric impact.






34. 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)






35. A continuous spectrum of light missing energy at a few wave lengths.






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






37. 10^2 nm 10^7 nm






38. Approximate speed of light in a vacuum






39. The larger bodies that formed early in teh solar nebula that were chemically differentiated






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






41. The most mass a white dwarf can have before collapsing to a neutron star






42. The material from which the solar system formed






43. 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.






44. As open clusters age - they push gas away but dust remains this can reflect light giving the cluster a blue-ish color. also called reflection nebula






45. Jupiter






46. Radiation emitted when charged particles spiral rapidly in a magnetic field. come off of jets from black holes.






47. 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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48. Form honeycomb like patterns surrounding empty or nearly empty voids.






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






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