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






2. Removal of static electricity by conduction






3. 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






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






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






6. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions






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






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






9. A circut with two or more resistors where the electricity has more than one path to travel






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






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






12. '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






13. Heat transferred by direct contact






14. 2 or more substances combine to form a compound EX. A+B -> AB






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






16. Negatively charged particles found outside the nucleus






17. The more energy the electrons have






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






19. 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.






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






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






22. Uses the transfer of heat from one substance to another to determine the specific heat of the substance.






23. Number of protons






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






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






26. Small uncharged particles in the nucleus they are neutral






27. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.






28. Gram is the base unit of...






29. 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






30. 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






31. 1/1000 the base unit






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






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






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






35. Reflects the light in one direction






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






37. The process of heat transfer via solid contact






38. Way of keeping tract of valence electrons






39. An isotope has a different number of...






40. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.






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






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






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






44. Where are protons an neutrons located?






45. Change from gas to liquid






46. 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?






47. 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.






48. Shiny - softer & less dense. Mostly chemically active






49. Alkaline earth metals






50. According to some scientists - the Earth's average surface temperature is rising as a result of the greenhouse effect. An increase in the atmospheric concentration of which of the following gases is considered to be primarily responsible