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 quantity measuring the stability of the Earth's atmosphere






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






3. A planet that is closer to the sun than the earth






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






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






6. The fusion process that turns three helium nuclei into a carbon nucleus






7. 1 mm 1μm






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






10. IO






11. Mercury






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






13. 10 cm -> 1 mm






14. A fusion process in which protons build together to form helium






15. Hydrogen and helium (mainly)






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






17. A word used in astronomy to describe all elements besides hydrogen and helium






18. Star speed at outer edge of galaxy should begin to diminish - but they dont so we guess that this means there is increasing force (aka dark matter)






19. 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






20. The linear correlation between the rate of the expansion of the universe and distance. Says that as galaxies get farther away in space - the speed with which they recede from us increases. So we can measure the amount of recessional velocity and use






21. 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.






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






23. Sc galaxies






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






25. Centered on the sun.






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






27. When the Moon entirely blocks the Sun.






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






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






30. Titan






31. 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






32. The oldest terrain on the moon






33. 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






34. Medium bulge - moderately would arms - arms have H2 regions in them and look sort of lumpy






35. 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)






36. The oldest grouping of stars - found in the galaxy halo






37. The rock that makes up the lunar highlands






38. A large and bright but cool star.






39. IO






40. A method of finding a star's distance from its absolute magnitude and spectral type or color.






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






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






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






44. A technique using computer-controlled mirrors to sharpen images distorted by the atmosphere






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






46. The location of a supermassive black hole






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






48. N=are*Fp(Ne)(Fl)(Fi)(Fc)(L) N: number of civilizations possible to communicate with are*: rate solar-like stars are created Fp: fraction of stars with planets Ne: number of planets like ours Fl: fraction of planets with life Fi: intelligent life Fc:






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






50. Mercury