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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. Stored mechanical - Nuclear - Chemical - gravitational






2. Heat transferred by fluid current






3. Liter is the base unit of...






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






5. '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






6. The more energy the electrons have






7. They form only over warm oceans






8. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






9. Way of keeping tract of valence electrons






10. Change from gas to liquid






11. Alkaline earth metals






12. 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






13. Change in the apparent frequency of a wave as observer and source move toward or away from each other






14. Relates pressure & temp. and temp and volume.






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






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






17. A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms. Ideal for energy transfer reactions (ATP).






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






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






20. # of electrons. Non - metals have 4-8 electrons in their outermost energy.






21. The monovalent group - OH in such compounds as bases and some acids and alcohols. Makes the molecule polar which increases the solubility of a compound.






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






23. Nuclear fission - Nuclear Fusion






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






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






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






27. Measure of the earth's pull






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






29. 1. nuclear reaction 2. radioactive






30. Mass & weight are not the ____ quality






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






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






33. 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)






34. Heat transferred by direct contact






35. Animals in which of the following groups may have a backbone and a spinal cord?






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






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






38. 1000x the base unit






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






40. Where are protons an neutrons located?






41. 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.






42. Is the change from liquid to gas.






43. Reflects the light in one direction






44. 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






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






46. Is the path along which electrons flow






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






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






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






50. The amount of energy required to change a substance from the solid phase to the liquid phase at its melting point