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Praxis General Science

Subjects : praxis, 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. Record vibrations in earth & allow us to measure earthquake activity.






2. A material such as glass or porcelain with negligible electrical or thermal conductivity. Electric charges do not move easily - if at all.






3. Atoms with an equal # of protons and electrons.






4. The mechanical energy that a body has by virtue of its position Ex. Stored energy -






5. A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms. Ideal for energy transfer reactions (ATP).






6. A piece of paper that appears blue in sunlight is illuminated solely by a red light that is passed through a green filter. What color does the paper appear under this illumination?






7. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?






8. They form only over warm oceans






9. 1. Have some characteristics of metals & non - metals. 2. Properties do not follow patterns like metals & non - metals.






10. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B






11. When force is applied to an object it moves in a straight line and adding force can make it go faster or slow down.






12. A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy






13. The center of the atom.






14. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






15. Formed when one or more electrons are transferred from one atom to another. Transfer of electrons happens when metals & non - metals bond.






16. 2 or more substances combine to form a compound EX. A+B -> AB






17. Is a simple device used to indicate the existence of a positive or negative charge.






18. Nuclear fission - Nuclear Fusion






19. Solid has a definite shape and volume - Liquid has definite volume - but no shape - Gas has no shape of volume.






20. A carbon atom linked by a double bond to an oxygen atom. - c=o.






21. The mechanical energy that a body has by virtue of its motion - energy of a moving object.






22. Measures the amount of matter in an object






23. The centripetal force is provided by the high banking of the curved road & by friction between the wheels & the road.






24. 1000x the base unit






25. A unit of heat equal to the amount of heat required to raise the temperature of one kilogram of water by one degree at one atmosphere pressure. used by nutritionists to characterize the energy - producing potential in food






26. Uses sound waves to locate objects and is especially useful underwater the sound waves bounce off the object and are used to assist in location






27. An isotope has a different number of...






28. Transfer of thermal energy with in a fluid. The particles in a fluid transfer the thermal energy from hot areas to cooler areas EX. the warmed up rising air from a heat source such as a fire or electric heater.






29. Non - metals - group 18 - the most non - reactive elements






30. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?

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31. Elements in the middle of the periodic table - in groups 3-12.






32. The sum of the protons and neutrons






33. Alkaline earth metals






34. 10x the base unit






35. As the velocity of a fluid increases - the pressure exerted by the fluid decreases - The speed of a fluid - liquid - gas - increases the pressure exerts.






36. Two or more simple machines working together EX. wheelbarrow it uses level - wheel & axle.






37. Alkali Metals are the most _____________






38. Is the work done divided by the amount of the time it took to do it. P= w/t






39. Number of protons






40. Is done on an object when an applied force moves across a distance.






41. Which of the following parts of the Sun is easily visible only during a total solar eclipse






42. Uses electrical charges of molecules to separate them according to their size the molecules such as DNA or proteins - are pulled through a gel towards either the positive end of the gel box.






43. The molecular weight of a substance expressed in grams - measures the amount of a substance






44. 1. Constructive 2. Destructive






45. Pushing a vacuum cleaner or pulling a bowstring applies muscular force when the muscles expand & contract elastic force occurs when an object returns to its original shape (for example - when a bow is released)






46. The agent most widely and most consistently at work changing the appearance of the Earth's surface






47. Electrons in the outermost energy level; they are involved in bond formation






48. Finding that a solution conducts an electric current shows conclusively that the solution...






49. Do not have molecules with one of the two molecular arrangements required to give an odor






50. Relates pressure & temp. and temp and volume.