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






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






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






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






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






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






7. Potential & Kinetic






8. Nuclear fission - Nuclear Fusion






9. Where are protons an neutrons located?






10. Is the transfer of heat with no actual transfer of matter. Ex. Iron pan of flame.






11. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.






12. 1. Liquid crystals - when certain solids melt their crystal lattices disintegrate & their particles lose their 3- dimensional pattern. 2. Solid - as a liquid substance cools & forms a solid. The strong attractive forces between oppositely charges ion






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






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






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






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






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






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






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






20. Submarines - diving weighting system - naval architecture - Flotation - Buoyancy compensator






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






22. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.






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






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






25. 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 -






26. The acceleration of an object depends on the mass of the object and the amount of force applied.






27. 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.






28. The region around a magnet where the magnetic force is exerted






29. Excess energy is released into the environment






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






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






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






33. Reflects the light in one direction






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






35. 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.






36. 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






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






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






39. Measures the amount of matter in an object






40. 8 electrons






41. 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.






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






43. 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






44. 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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45. 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?






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






47. A principle that states that for every action there is an equal reaction in the opposite direction

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






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






50. Friction opposes the motion of one surface past another - Friction is common when slowing down a car or sledding down a hill.