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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. All processes cease when temperature approaches 0.






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






3. 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.






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






5. Mass of the substance contained per unit of volume






6. 1. nuclear reaction 2. radioactive






7. Alkaline earth metals






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






9. Heat transferred by fluid current






10. 10x the base unit






11. Metal - nonmetals - & metalliods






12. Electronic equipment that provides visual images of varying electrical quantities - Useful in studying waves b/c it gives a picture of the wave.






13. # of protons + # of neutrons






14. Alkali Metals are the most _____________






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






16. Are small positively charged particles






17. 1/10 the base unit






18. They are neither precise nor accurate.






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






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






21. Parts of 2 compounds replace each other. Ex. Switch partners AX + BY -> AY + BX






22. 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






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






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






25. Potential & Kinetic






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






27. Causes motion






28. An electric circut with a single path






29. The more energy the electrons have






30. Gram is the base unit of...






31. That for a fixed amount of gas at a constant temperature - the volume of a gas increases as its pressure decreases






32. 1. Constructive 2. Destructive






33. 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?






34. 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.






35. 8 electrons






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






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






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






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






40. 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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41. 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.






42. Liter is the base unit of...






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






44. Way of keeping tract of valence electrons






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






46. The buoyant force on an object is equal to the weight of the fluid displaced by the object






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






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






49. Pushing a vacuum cleaner or pulling a bowstring applies muscular force when the muscles expand & contract elastic force occurs when an object returns to its original shape (for example - when a bow is released)






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