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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. Is done on an object when an applied force moves across a distance.






2. Liter is the base unit of...






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






4. 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






5. Alkaline earth metals






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






7. 100x the base unit






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






9. 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?






10. Mass & weight are not the ____ quality






11. States that when 2 objects collide in an isolated system the total momentum of 2 objects after the collision. That is the momentum gained by object.






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






13. Excess energy is released into the environment






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






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






16. (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.






17. Solids - gasses - and 1 liquid (Bromine)






18. An electric circut with a single path






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






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






21. 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)






22. Small uncharged particles in the nucleus they are neutral






23. 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.






24. Measures the amount of matter in an object






25. 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.






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






27. The process of heat transfer via solid contact






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






29. 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.






30. 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






31. A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy






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






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






34. Alkali Metals are the most _____________






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






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






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






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






39. They form only over warm oceans






40. Solutes that have bonds; no electrically charged species are created when they dissolve in water; glucose; lipids; urea






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






42. 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.






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






44. 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






45. 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.






46. Decibels






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

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






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






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







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