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. Half of the longest diameter across an ellipse






2. The point in its orbit where a planet is farthest from the sun






3. A word meaning 'the same in all directions.'






4. Venus






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






6. 1-orbit aroudn the sun 2- are in hydrostatic equilibrium and 'mostly round' 3- have not cleared debris around its orbit 4- are not satellites






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






8. The entity from which the whole universe is postulated to have come from.






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






10. 1μm 100 nm






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






12. The science of measuring light energy by wavelength.






13. A representation of the changes in color and brightness of an evolving protostar.






14. The crust of a meteorite caused by its entry into Earth's atmosphere






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






16. A term referring to Jupiter-like planets






17. Population 1- similar to the sun and 2% of elements are metal - Population 2- formed before gas was metal- only a fraction of mass is metal.






18. A cloud of ionized hydrogen. Formed when young stars heat the surrounding gas






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






20. A telescope that uses mirrors to focus light






21. A small and dim but hot star.






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






23. The name for the only seriously considered theory of the universe.






24. Earth






25. 100 nm 10 nm






26. 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.






27. A small spherical dark nebula






28. Finding a star's absolute magnitude from it's placement on an HR diagram. After finding the absolute magnitude - we measure the apparent magnitude - for a distance modulus and use this to find the distance. This method is good for finding distances t






29. A small chunk of rock in space






30. The rock that makes up the lunar maria






31. A cool collection of gas and dust silhouetted against a brighter background of stars and/or gas






32. A nearby galaxy with a quasar-like nucleus. closer but less bright than quasars-weaker






33. The distance light travels in one year (=9.46x10^12km).






34. The mass of an object divided by its volume






35. Light scattered through the atmosphere that degrades astronomical images






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






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






38. Jupiter - Saturn - Uranus - Neptune






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






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






41. 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






42. A telescope that uses lenses to focus light






43. The process responsible for creating the arms of flocculent spiral galaxies






44. When the Sun moves from south to north across the celestial equator (about March 21)






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






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






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






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






49. A quantity measuring the stability of the Earth's atmosphere






50. The slow wobble of the Earth on its rotation axis.