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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. Heat transferred by fluid current






2. Electrical - Light (radiant) - Heat (thermal) - Movement






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






4. 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?






5. Group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts






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






7. 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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8. Uses sound waves to locate objects and is especially useful underwater the sound waves bounce off the object and are used to assist in location






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






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






11. The sum of the protons and neutrons






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






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






14. 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 -






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






16. Nuclear fission - Nuclear Fusion






17. The center of the atom.






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






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






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






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






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






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






24. Measures the amount of matter in an object






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






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






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






28. Meter is the base unit of...






29. The difference in electrical charge between two points in a circuit expressed in volt. When an electron goes through a load it does work & loses some energy.






30. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B






31. Excess energy is released into the environment






32. P1/T1=P2/T2. States that the pressure of a fixed amount of gas in a fixed volume is proportional to its temperature.

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33. Stored mechanical - Nuclear - Chemical - gravitational






34. Compounds that speed up chemical reactions. Sometimes without Catalysts reactions cant occur.






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






36. 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.






37. Concave






38. Alkali metals






39. Gram is the base unit of...






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






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






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






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






44. Pressure is measures in a unit called






45. 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.






46. # of protons + # of neutrons






47. Is a simple device used to indicate the existence of a positive or negative charge.






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






49. 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.






50. Mass & weight are not the ____ quality