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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. A boulder is sitting at the edge of the cliff it has which type of energy?






2. According to some scientists - the Earth's average surface temperature is rising as a result of the greenhouse effect. An increase in the atmospheric concentration of which of the following gases is considered to be primarily responsible






3. Heat energy that is transferred into or out of a system






4. Rotate at very high speed in order to separate the liquids from the solids. The more dense part of the solution will sediment at the bottom of the test tube. while the lighter material will stay on top. Ex. centrifuge is used to separate blood from b






5. 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.






6. 1. Constructive 2. Destructive






7. You see your reflection






8. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat






9. 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






10. The speed of light changes in different materials this is due to__






11. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions






12. The device (bell or Build) is an example of a load. A load is a device that uses energy.






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






14. What are the # of protons in the nucleus of an atom called?






15. Decibels






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






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






18. It scatters light in many directions






19. Gram is the base unit of...






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






21. 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?






22. Measures the amount of matter in an object






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






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






25. The process of heat transfer via solid contact






26. Lacking affinity for water. Repels water. Non - polar






27. Mass of the substance contained per unit of volume






28. Electrical - Light (radiant) - Heat (thermal) - Movement






29. Mass & weight are not the ____ quality






30. Is the change from liquid to gas.






31. Specific gravity is the ratio based on...






32. Meter is the base unit of...






33. Solutes that have bonds; no electrically charged species are created when they dissolve in water; glucose; lipids; urea






34. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles






35. Series circut - Parallel circut






36. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.






37. Is the study of the relationship between motion & the forces affecting motion.






38. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power






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






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






41. Uses the principles of capillary action to separate substances such as plant pigments molecules of a larger size will migrate up the paper more quickly produce lines of pigment. - a process used for separating mixtures by virtue of differences in abs






42. The interference that occurs when two waves combine to make a wave with a larger amplitude






43. Small uncharged particles in the nucleus they are neutral






44. Objects are in thermal contact if they can affect each others temperature






45. Alkali metals






46. 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.






47. Number of protons






48. They form only over warm oceans






49. Submarines - diving weighting system - naval architecture - Flotation - Buoyancy compensator






50. P1/T1=P2/T2. States that the pressure of a fixed amount of gas in a fixed volume is proportional to its temperature.

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