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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. Change from gas to liquid






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






3. 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?






4. A piece of paper that appears blue in sunlight is illuminated solely by a red light that is passed through a green filter. What color does the paper appear under this illumination?






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






6. Excess energy is released into the environment






7. Where are protons an neutrons located?






8. A functional group consisting of a sulfur atom bonded to a hydrogen atom (






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






10. The center of the atom.






11. '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






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






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






14. Uses electrical charges of molecules to separate them according to their size the molecules such as DNA or proteins - are pulled through a gel towards either the positive end of the gel box.






15. Meter is the base unit of...






16. Is the change from liquid to gas.






17. (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.






18. 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.






19. 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






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






21. Reflects the light in one direction






22. Is formed when 2 atoms share electrons - covalent bonding happens among non - metals.






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






24. Resistance is measured in...






25. An electric circut with a single path






26. Static friction - Kinetic friction - Push & pull - rubbing - pull of gravity - forces on objects at rest - forces on a moving object - inertia & circular motion.






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






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






29. Heat transferred by direct contact






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






31. Causes motion






32. 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






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






34. 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.






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






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






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






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






39. They form only over warm oceans






40. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






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






42. 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.






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






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






45. The amount of energy required for the liquid at its boiling point to become a gas






46. 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






47. They are neither precise nor accurate.






48. The acceleration of an object depends on the mass of the object and the amount of force applied.






49. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?

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50. All processes cease when temperature approaches 0.