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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. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.






2. A wave in which the particles of the medium move perpendicularly to the direction the wave is traveling






3. 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






4. A wave in which the particles move parallel to the path of the wave






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






6. 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.






7. Alkali Metals are the most _____________






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






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






10. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.






11. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.






12. The total entropy of a system plus that of its surroundings always increase.






13. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






14. Mass of the substance contained per unit of volume






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






16. 1. Constructive 2. Destructive






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






18. Several vehicles - initially at a complete stop - begin a long race at the same starting point. The vehicle that has a constant value for which of the following is most likely to win?






19. Consists of frequency (f) - measured in hertz - and wavelength measured in meters - the frequency times the wavelength of every electromagnetic wave equals the speed of light.






20. Symmetry - crystalline structures are universal - Crystallographic defects - Electrical properties - crystal system






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






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






23. An electric circut with a single path






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






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






26. Inclined plane - lever - wheel & axle - pulley.






27. 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.






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






30. Is formed when 2 atoms share electrons - covalent bonding happens among non - metals.






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






32. You see your reflection






33. Have properties in between metals and non - metals found in groups 13-16






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






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






36. Most directly involved with controlling levels of sugar in blood






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






38. The amount of energy required for the liquid at its boiling point to become a gas






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






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






41. Are small positively charged particles






42. A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten Ex. Brass is an alloy of zinc and copper






43. Causes motion






44. Is the transfer of heat with no actual transfer of matter. Ex. Iron pan of flame.






45. 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?






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






47. 1000x the base unit






48. Reflects the light in one direction






49. Is the path along which electrons flow






50. Group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts