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Praxis Physics Basic Principles

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. Rate at which work is performed






2. Refers to the energy of an object in motion.






3. How do you determine the volume of an irregularly shaped object?






4. Capable of interacting with a surrounding environment and can exchange heat - work (energy) and matter outside their system boundaries






5. Conservation of Energy (energy can only be transferred - not created or destroyed)






6. Attributes such as appearance - color - mass - and volume.






7. Branch of Physics that studies the conversion of energy into work and heat. Concerned w/ variables such as temperature - volume - and pressure






8. Refers to the fact that the total amount of energy in a closed system is constant






9. The capacity to do work






10. Solid - Liquid - Gas






11. A misguided belief that a system can continuously produce more energy than it consumes.






12. Contain two or more substances that are combined but have not reacted chemically. They can be separated using physical methods






13. A System that cannot exchange heat - work - or matter with its surroundings. Total Energy & Mass stay constant w/in system






14. A Machine that converts thermal energy to mechanical energy that can be used to do work






15. Measure of gravitational pull of Earth on an object or between two bodies






16. Substances that consist of only one type of atom






17. Refers to everything outside a thermodynamic system.






18. Refers to the amount of energy in a system that is no longer available for work. (also used to describe the amount of disorder in a group)






19. Splitting of a large nucleus into smaller pieces






20. Substance containing two or more elements; formed by chemical reactions. Can only be separated by a chemical reaction






21. The measure of the ratio of a substance's density compared to the density of water.






22. 1st (K Shell) = 2 electrons - 2nd (L Shell) = 8 electrons - 3rd (M Shell) = 18 electrons - 4th (N Shell) = 32 electrons






23. The quantity of energy transferred by one system to another due to changes in a system that is the result of external forces; also can be described as the amount of energy that must be transferred to overcome a force.






24. Measurement of Work






25. Energy transferred to a body by a means other than work. (through the process of heat)






26. Occurs when an unstable atomic nucleus spontaneously loses energy by emitting ionizing particles & radiation. It is a form of energy transfer. Before Decay = parent nuclide After Decay = Daughter nuclide (s)






27. A change that results in a different substance. They may release or consume energy.






28. Substances that have mass and occupy space






29. The time it takes for half of the radioactive nuclei in a sample to undergo radioactive decay.






30. AKA Mass Number. The total number of protons and Neutrons in the nucleus of an atoms. Referred to as 'A.'






31. Measure of the amount of substance in an object






32. Joining of two nuclei; occurs under extreme temperatures and pressure. Fusion occurs naturally in stars (responsible for the release of great energy).






33. Transfer of Energy from a body or system as a result of thermal contact. Heat consists of random motion and the vibration of atoms - molecules - & ions. Higher the temperature - greater the atomic/molecular motion






34. Atoms that have an unstable nucleus that has excess energy and the potential to make radiation particles within the nucleus or undergo radioactive decay which can result in the emission of gamma rays. May occur naturally or artificially produced.






35. Positive; larger than Beta. Because of their large mass they can be easily stopped (even with a sheet of paper.) Can cause severe damage if ingested.






36. Two or more atoms held together by covalent bonds






37. Isotopes that have not been observed to decay






38. A change that does not result in different substances; when an object changes form but not compostion.






39. Total Kinetic Energy and Potential Energy in a system






40. The capacity for doing work that is based upon position or configuration.






41. A variation of an atom; occur when the number of protons in the nucleus are the same but the number of neutrons are not. Written as the element plus the number of Neucleons (i.e. Carbon -13 (6 Protons - 7 Neutrons)






42. Causes an electron to detach from an atom; occurs in radioactive reactions. Three types: 1. Alpha 2. Beta 3. Gamma






43. A system that can exchange heat and work - but not matter






44. Refers to the particles that are emitted from nuclei as a result of nuclear instability






45. Measurement of the amount of cubic space occupied.






46. Properties concerned with the constituent particles that make up a substance. Can include: Atomic Number - Category - Group - Period - Block - weight - electron configuration - electrons per shell - phase - density - Sublimation point - specific heat






47. Ratio of the average mass per atom of a sample (which can include various isotopes) to 1/12 of the mass of an atom of carbon -12.






48. Hydrogen and Helium are the most abundant. Than Oxygen - Neon - Nitrogen - Carbon - Silicon - and Magnesium.






49. When energy is emitted by one body and absorbed by another






50. Homogeneous mixtures composed of two or more substances that have become one