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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 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






2. 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.






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






4. Discovered in the late 1800s that micro organisms play a casual role in onset of a disease






5. Alkali metals






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






7. Elements in the middle of the periodic table - in groups 3-12.






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






9. Used in electrical devices that have to function at temperatures too high for metals.






10. The agent most widely and most consistently at work changing the appearance of the Earth's surface






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






12. It scatters light in many directions






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






14. As the velocity of a fluid increases - the pressure exerted by the fluid decreases - The speed of a fluid - liquid - gas - increases the pressure exerts.






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






16. Where are protons an neutrons located?






17. Resistance is measured in...






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






19. Energy is added to a system one of two things must happen either thermal energy must increase or work must be done.






20. The transfer of heat by electromagnetic waves is called?






21. Excess energy is released into the environment






22. The device (bell or Build) is an example of a load. A load is a device that uses energy.






23. 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.






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






25. Potential & Kinetic






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






27. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy






28. (physics) a process that alters the energy or structure or composition of atomic nuclei - When a reaction involves the nucleus - elements become different thus is called a nuclear reaction.






29. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power






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






31. Harder - denser - have higher melting points & are chemically active.






32. 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.






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






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






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






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






37. 1. Constructive 2. Destructive






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






39. 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?






40. The amount of energy required to change a substance from the solid phase to the liquid phase at its melting point






41. The mechanical energy that a body has by virtue of its motion - energy of a moving object.






42. Measure of the earth's pull






43. 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.






44. Reduction in pressure of a fluid resulting from the speed increase as fluids are forced to flow faster through narrow spaces






45. 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.






46. 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.






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






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






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






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