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. Hydrogen and helium (mainly)






2. 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






3. The distance a moon can be from a planet before shattering from tidal forces






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






5. Sc galaxies






6. Small moons that maintain the shape of rings around Saturn and Uranus






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. Mercury - Venus - Earth - Mars






9. A star that blows itself apart






10. The oldest terrain on the moon






11. 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






12. The gap etween saturn's A and B rings






13. The location in an H-are diagram of a star cluster - where stars have just left the main sequence. Used to estimate the cluster age.






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






15. Poitns of gravitational stability in the orbit of a planet






16. Loops that trace the magnetic field as it erupts from a sunspot area and arches over to an adjacent area. They glow in the light of gas pouring out of corona and falling into photosphere.






17. 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






18. The philosophical stand that says a simpler explanation is more likely to be correct than a complicated one.

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19. Sa - Sb galaxies where two magnificent arms wind their way from nucleus out in a symmetrical manner.






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






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






22. The layer of the sun just above the photosphere






23. 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)






24. Cold aggregates of gas - large and contain a huge amount of matter - so cold that molecules stick together to form molecules.






25. The number of protons in an atom.






26. A term referring to Earth-like planets






27. 1 mm 1μm






28. Europa






29. 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.






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






31. A star that is in the process of forming. It glows from gravitational contraction






32. The rotation of a star or planet at different speeds at its equator and poles






33. Dying small mass stars lose their outer layers in a relatively gentle way - creating a round or bipolar nebula about the star (round like planets)






34. Mercury and venus






35. In Ptolemy's geocentric solar system - the large circle on which a planet's epicycle moved around the Earth.






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






37. A faint - remarkably uniform distribution of radiation in space






38. A long-lived high-pressure bulge in Jupiter's southern hemisphere






39. 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.






40. Radiation given off by electrons accelerating in a magnetic field






41. Is there water on the moon?






42. The lowest energy of an atom.






43. The state of having a balance between inflowing and outflowing heat-- the temp at every radial point is different but constant






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






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






46. 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






47. The point where a superior planet is as far away from the sun as it can be (as seen from the Earth)






48. A bright area of higher temperature that often proceeds the formation of sunspots.






49. 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






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