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






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






3. Mass & weight are not the ____ quality






4. Reduction in pressure of a fluid resulting from the speed increase as fluids are forced to flow faster through narrow spaces






5. The region around a magnet where the magnetic force is exerted






6. Clustered regions of aligned magnetic atoms. When these regions are aligned with one another - the substance containing them is a magnet.






7. 1. Constructive 2. Destructive






8. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






9. Used in electrical devices that have to function at temperatures too high for metals.






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






11. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.






12. The state of two or more objects or substances in thermal contact when they have reached a common temperature - EX. the affects after a hot cup of coffee meeting the desk temperature.






13. Number of protons






14. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy






15. All processes cease when temperature approaches 0.






16. (physics and chemistry) the smallest component of an element having the chemical properties of the element






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






18. Way of keeping tract of valence electrons






19. Organic molecules that are composed of only carbon and hydrogen.






20. The transfer of heat by electromagnetic waves is called?






21. 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.






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






23. Static friction - Kinetic friction - Push & pull - rubbing - pull of gravity - forces on objects at rest - forces on a moving object - inertia & circular motion.






24. Change in the apparent frequency of a wave as observer and source move toward or away from each other






25. Change from gas to liquid






26. States that when 2 objects collide in an isolated system the total momentum of 2 objects after the collision. That is the momentum gained by object.






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






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






29. Potential & Kinetic






30. It scatters light in many directions






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






32. Resistance is measured in...






33. Energy is added to a system one of two things must happen either thermal energy must increase or work must be done.






34. Is the measure of energy temperature is a measure of the heat in an object.






35. The interference that occurs when two waves combine to make a wave with a smaller amplitude






36. The buoyant force on an object is equal to the weight of the fluid displaced by the object






37. Temporary magnets that lose their magnetism when electric current is removed






38. 1. All are solids having the appearance of metals & non - metals. 2. All are white or gray - but not shiny 3. Conduct electricity - but not as well as metals.






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






40. 1/1000 the base unit






41. Stored mechanical - Nuclear - Chemical - gravitational






42. Measure of the earth's pull






43. A heat that required to change (water from liquid to solid) from one state to another.






44. Alkali Metals are the most _____________






45. Solids - gasses - and 1 liquid (Bromine)






46. When you step out of the shower the floor feels colder on your feet than the bathmat. Because heat is ______________ to the floor.






47. Reflects the light in one direction






48. Heat absorbed or radiated during a change of phase at a constant temperature and pressure - the amount of heat required to undergo a phase change






49. The difference in electrical charge between two points in a circuit expressed in volt. When an electron goes through a load it does work & loses some energy.






50. Mass of the substance contained per unit of volume