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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. Specific gravity is the ratio based on...






2. You see your reflection






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






4. Carbon atom - atomic number 6 - atomic mass 11






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






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






7. A functional group consisting of a sulfur atom bonded to a hydrogen atom (






8. The ability of the material to oppose the flow of electrons through it all






9. They form only over warm oceans






10. Heat transferred by direct contact






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






13. Substance that dissociates completely into its ions when added to water and conducts electricity well.






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






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






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






17. The relationship between voltage - current - and resistance - V=IR






18. Average mass of various isotopes of the element.






19. The acceleration of an object depends on the mass of the object and the amount of force applied.






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






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






22. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.






23. Change the chemical composition of a material - Computers can be made small enough to fit inside a plastic credit card - resistors are used to regulate volume on television or radio -






24. 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






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






26. A compound of which a relatively small amount of the dissolved solute exists as ions in an aqueous solution. Example: Acetic acid - CH3COOH (vinegar)






27. The object is further than one focal length from the lens






28. Small uncharged particles in the nucleus they are neutral






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


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






31. Higher because it has higher apparent frequency.






32. 1. nuclear reaction 2. radioactive






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






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






35. Inertia is the tendency of any object to resist change in motion. An object at rest tends to stay at rest. An object that is moving tends to keep moving.






36. 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.






37. Mass of the substance contained per unit of volume






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






39. Series circut - Parallel circut






40. 1000x the base unit






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






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






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






45. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.






46. 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?






47. 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






48. 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.






49. Is the change from liquid to gas.






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