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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. 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






2. It scatters light in many directions






3. The centripetal force is provided by the high banking of the curved road & by friction between the wheels & the road.






4. The volume of a gas is directly proportional to the temperature of a gas






5. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat






6. They form only over warm oceans






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






8. Which of the following parts of the Sun is easily visible only during a total solar eclipse






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






10. Mass & weight are not the ____ quality






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






12. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






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






14. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.






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






16. 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.






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






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






19. When you step out of the shower the floor feels colder on your feet than the bathmat. Because heat is ______________ to the floor.






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






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






22. Making and breaking of chemical bonds between atoms bonds involve only the outer electrons & do not effect the nucleus






23. An electric circut with a single path






24. P1/T1=P2/T2. States that the pressure of a fixed amount of gas in a fixed volume is proportional to its temperature.

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25. # of protons + # of neutrons






26. 10x the base unit






27. Stored mechanical - Nuclear - Chemical - gravitational






28. 1. All are solids having the appearance of metals & non - metals. 2. All are white or gray - but not shiny 3. Conduct electricity - but not as well as metals.






29. 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.






30. 1/10 the base unit






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






32. (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.






33. 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.






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






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






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






37. 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






38. Mass of the substance contained per unit of volume






39. 1/1000 the base unit






40. The force of attraction between two objects. Gravity exists not only on earth - but also between planets as well as in black wholes






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






42. The more energy the electrons have






43. 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






44. All processes cease when temperature approaches 0.






45. Are small positively charged particles






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. Metal - nonmetals - & metalliods






48. 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?






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






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