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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. 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






2. 1/10 the base unit






3. Concave






4. Series circut - Parallel circut






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






6. 1/1000 the base unit






7. 1. nuclear reaction 2. radioactive






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






9. Uses percent light absorbance to measure a color change - thus giving qualitative data using quantitative value - measures light intensity as a function of color - or more specifically - the wavelength of light.






10. Average mass of various isotopes of the element.






11. 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






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






13. Measure of the earth's pull






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






15. A buret is used to deliver solution in precisely - measured - variable volumes. deliver one reactant until the precise end point of the reaction is reached.






16. 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.






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






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






19. 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.






20. Electrons that can accept energy from outside sources and move farther away from the nucleus






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






22. Alkali metals






23. Mass & weight are not the ____ quality






24. Excess energy is released into the environment






25. Negatively charged particles found outside the nucleus






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






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






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






29. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.






30. Potential & Kinetic






31. The monovalent group - OH in such compounds as bases and some acids and alcohols. Makes the molecule polar which increases the solubility of a compound.






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






33. The sum of the protons and neutrons






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






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






36. Ratio of the density of a substance to the density of water






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






38. The amount of heat it takes to change a solid to a liquid






39. F - branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions






40. It is second element in group 14 - semi - conductor. Sand is made of silicon - it is also used to manufacture glass and cement.






41. Removal of static electricity by conduction






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






43. Shiny - softer & less dense. Mostly chemically active






44. Meter is the base unit of...






45. The volume of a gas is directly proportional to the temperature of a gas






46. (of a chemical reaction or compound) occurring or formed with absorption of heat. Absorbs energy from its surroundings.






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






48. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






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






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







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