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






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






3. Change from gas to liquid






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






6. 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.






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






8. (physics) the capacity of a physical system to do work - or supply heat.






9. You see your reflection






10. A compound of which a relatively small amount of the dissolved solute exists as ions in an aqueous solution. Example: Acetic acid - CH3COOH (vinegar)






11. 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 -






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






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






14. 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)






15. Stored mechanical - Nuclear - Chemical - gravitational






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






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






18. Heat absorbed or radiated during a change of phase at a constant temperature and pressure - the amount of heat required to undergo a phase change






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






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






21. It is second element in group 14 - semi - conductor. Sand is made of silicon - it is also used to manufacture glass and cement.






22. Number of protons






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






24. The agent most widely and most consistently at work changing the appearance of the Earth's surface






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






26. Measures the amount of matter in an object






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






28. A wave in which the particles of the medium move perpendicularly to the direction the wave is traveling






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






30. '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






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






32. 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.






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






34. Heat energy that is transferred into or out of a system






35. A boulder is sitting at the edge of the cliff it has which type of energy?






36. 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






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






38. 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.






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






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






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






42. The relationship between voltage - current - and resistance - V=IR






43. 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?






44. Conduction - Convection - & Radiation






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






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






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






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






49. It scatters light in many directions






50. Used in electrical devices that have to function at temperatures too high for metals.






Can you answer 50 questions in 15 minutes?



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