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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 circut with two or more resistors where the electricity has more than one path to travel






2. 1/1000 the base unit






3. A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms. Ideal for energy transfer reactions (ATP).






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






5. Causes motion






6. Compounds that speed up chemical reactions. Sometimes without Catalysts reactions cant occur.






7. 100x the base unit






8. The branch of physics that deals with static electricity - study of stationary electric charges.






9. 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






10. Is the path along which electrons flow






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






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






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






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






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






16. SI unit of temperature; indicates number of units above absolute zero. To go from Celsius to Kelvin add 273. To go from Kelvin to Celsius subtract 273.






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






18. Removal of static electricity by conduction






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






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






21. Atoms of the same element that have different numbers of neutrons






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






23. The property of sound that varies with variation in the frequency of vibration.






24. 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.






25. 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 -






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






27. A Compound breaks down into 2 or more simpler substances EX. AB -> A+B






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






29. 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






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






31. 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.






32. Measures the amount of matter in an object






33. Polar molecules






34. Number of protons






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






36. Uses the transfer of heat from one substance to another to determine the specific heat of the substance.






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






38. The formula F=M/A is a shorthand force equals mass over acceleration. An object will not move unless the force is strong enough to move the mass.






39. 1. Liquid crystals - when certain solids melt their crystal lattices disintegrate & their particles lose their 3- dimensional pattern. 2. Solid - as a liquid substance cools & forms a solid. The strong attractive forces between oppositely charges ion






40. Experiments may not be done on...






41. 2 or more substances combine to form a compound EX. A+B -> AB






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






43. 1. nuclear reaction 2. radioactive






44. Heat transferred by fluid current






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






46. Small uncharged particles in the nucleus they are neutral






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






48. Potential & Kinetic






49. The sum of the protons and neutrons






50. 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