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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. The same pathogen must be found in every person with the same disease - the pathogen must be isolated & grown in a culture - when the organism is re - introduced in an experimental animal - that animal should develop the same disease originally seen

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2. Metal - nonmetals - & metalliods






3. 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?






4. Is an atom that has all of its electrons in the lowest possible energy levels






5. Change from gas to liquid






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






7. The number of electrons per second that flow past a point in a circut.






8. Current is measured with a device called...






9. When measuring the volume of water in a graduated cylinder where does one read the measurement?






10. 2 or more substances combine to form a compound EX. A+B -> AB






11. 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.






12. Decibels






13. The more energy the electrons have






14. Gram is the base unit of...






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






16. The interference that occurs when two waves combine to make a wave with a smaller amplitude






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






18. 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.






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






20. Is done on an object when an applied force moves across a distance.






21. Record vibrations in earth & allow us to measure earthquake activity.






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






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






24. 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.






25. (physics) the capacity of a physical system to do work - or supply heat.






26. 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






27. It scatters light in many directions






28. Is the change from liquid to gas.






29. Alkali metals






30. 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






31. The amount of energy that it takes to raise one gram of water one degree celsius.






32. Electrons in the outermost energy level; they are involved in bond formation






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






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






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






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






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






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






39. Average mass of various isotopes of the element.






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






41. Series circut - Parallel circut






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






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






44. Solid has a definite shape and volume - Liquid has definite volume - but no shape - Gas has no shape of volume.






45. 1. Constructive 2. Destructive






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






47. 1000x the base unit






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






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






50. 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 -