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






3. Atoms of the same element that have different numbers of neutrons






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






5. 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.






6. They form only over warm oceans






7. The amount of heat it takes to change a solid to a liquid






8. What are the # of protons in the nucleus of an atom called?






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






10. Ratio of the density of a substance to the density of water






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






12. 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






13. 100x the base unit






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






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






16. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






17. Average mass of various isotopes of the element.






18. When measuring the volume of water in a graduated cylinder where does one read the measurement?






19. Gram is the base unit of...






20. Potential & Kinetic






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






22. 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






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






24. Polar molecules






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






26. Stored mechanical - Nuclear - Chemical - gravitational






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






28. Pressure is measures in a unit called






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






30. Heat transferred by direct contact






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






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






33. Measure of the disorder or randomness of the particles that make of a system (measurement of movement of particles in a spontaneous reaction) EX. entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity.






34. The state of two or more objects or substances in thermal contact when they have reached a common temperature - EX. the affects after a hot cup of coffee meeting the desk temperature.






35. 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






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






37. Is an atom that has all of its electrons in the lowest possible energy levels






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






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






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






41. Small uncharged particles in the nucleus they are neutral






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






43. Is the measure of energy temperature is a measure of the heat in an object.






44. Formed when one or more electrons are transferred from one atom to another. Transfer of electrons happens when metals & non - metals bond.






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






46. Mass & weight are not the ____ quality






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






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






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






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