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 number of protons in an atom.






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






3. The relation that tells how light dims with distance.






4. Centered on the sun.






5. Earth






6. Large bulge - tightly wound spiral arms - relatively few h2 regions and are smooth






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






8. 10^2 nm 10^7 nm






9. The mix of pure photon energy that emerged at the start of the universe.






10. Europa






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






12. A volume of space where few - if any - galaxies are located






13. Titan






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






15. Why do Galaxies move very rapidly in the interiors of the dense clusters?






16. The process similar to conduction by which energy moves from the solar core to the convective layer






17. An important quality of telescopes that increases as the square of the primary mirror or objective lens






18. Then the Sun moves from north to south across the celestial equator (about September 23)






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






20. What do we think the actual fate of the universe will be and why do we think this?






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






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






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






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






25. The faint glow of light left over from the Big Bang. cosmic microwave background are the photons that remain after the big bang that have not turned into matter.






26. A word meaning 'the same everywhere throughout.'






27. What Ole Roemer used to measure the speed of light in a vacuum






28. Radiation (possibly left over from the big bang) that fills the universe. Perfect black body spectrum and tells us a bit aout how galaxies are formed.






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






30. A distance measure determined by the shifting of a star against the background sky every 6 months.






31. That which is responsible for Jupiter's magnetic field






32. Large nebula consisting of very cold gas and dust






33. A star that erratically and explosively brightens and dims






34. Jupiter






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






36. The source of the force that is accelerating the expansion rate of the universe.






37. Ganymede






38. The rotation period of the Earth measured relative to the stars.






39. A planet that is farther from the sun than the Earth is






40. The oldest terrain on the moon






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

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42. 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






43. That which is responsible for Jupiter's magnetic field






44. The faint glow of light left over from the Big Bang. cosmic microwave background are the photons that remain after the big bang that have not turned into matter.






45. After stars form they pump light energy into surrounding gas causing it to heat up and glow (H2=ionized hydrogen - H1= neutral hydrogen in molcular couds)






46. 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






47. 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






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






49. The process that powers the sun and hydrogen bombs






50. A star that has become a red giant for the second and final time. It is burning helium to carbon in a shell surrounding the core