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






2. Liter is the base unit of...






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. A functional group consisting of a sulfur atom bonded to a hydrogen atom (






5. They are neither precise nor accurate.






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






7. Electrons that can accept energy from outside sources and move farther away from the nucleus






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






9. 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.






10. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






11. Mass of the substance contained per unit of volume






12. Nuclear fission - Nuclear Fusion






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






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






15. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia






16. The process of heat transfer via solid contact






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






18. Polar molecules






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






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






21. Measures the amount of matter in an object






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






23. The more energy the electrons have






24. Carbon atom - atomic number 6 - atomic mass 11






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






26. 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.






27. Potential & Kinetic






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






29. 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.






30. Removal of static electricity by conduction






31. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles






32. Rotate at very high speed in order to separate the liquids from the solids. The more dense part of the solution will sediment at the bottom of the test tube. while the lighter material will stay on top. Ex. centrifuge is used to separate blood from b






33. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






34. 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.






35. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?






36. Average mass of various isotopes of the element.






37. 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.






38. 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)






39. Organic molecules that are composed of only carbon and hydrogen.






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






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






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






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






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






45. Is formed when 2 atoms share electrons - covalent bonding happens among non - metals.






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






47. Pressure is measures in a unit called






48. 1.) Protons 2.) Neutrons - They both have the same mass - but neutrons have no mass.






49. Inclined plane - lever - wheel & axle - pulley.






50. 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.