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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. 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






2. The property of sound that varies with variation in the frequency of vibration.






3. Number of protons






4. 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.






5. Small uncharged particles in the nucleus they are neutral






6. Potential & Kinetic






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






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






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






10. 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.






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. Metal - nonmetals - & metalliods






13. Is the path along which electrons flow






14. 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?






15. Conduction - Convection - & Radiation






16. Nuclear fission - Nuclear Fusion






17. The process of heat transfer via solid contact






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






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






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






21. Alkali Metals are the most _____________






22. The center of the atom.






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






24. Experiments may not be done on...






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






26. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






27. You see your reflection






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






29. Relates pressure & temp. and temp and volume.






30. Which of the following parts of the Sun is easily visible only during a total solar eclipse






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






32. 100x the base unit






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






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






35. Clustered regions of aligned magnetic atoms. When these regions are aligned with one another - the substance containing them is a magnet.






36. Stored mechanical - Nuclear - Chemical - gravitational






37. The sum of the protons and neutrons






38. Atoms with an equal # of protons and electrons.






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






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






41. 1. nuclear reaction 2. radioactive






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






43. It is the first element in group 13 - is a poor conductor of electricity at low temperature - however if temperature increases it will become a good conductor.






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






45. (of a chemical reaction or compound) occurring or formed with absorption of heat. Absorbs energy from its surroundings.






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






47. Mass of the substance contained per unit of volume






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






49. 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






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