PART VIII: PCAT PRACTICE TEST in .NET framework

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PART VIII: PCAT PRACTICE TEST
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C By the year 2000, there were over 500 elk in Pennsylvania, including many in Elk County (Paragraph four) D Unlike in the 1910s, today reintroduction is vastly improved far more closely monitored and controlled (Paragraph ve)
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1 The discovery of electrons came about in a roundabout way In the latter part of the nineteenth century, a popular demonstration by lecturers involved the cathode ray They would evacuate air from the tube, pass high voltage through it, and show audiences the patterns of light that appeared Were these really waves traveling through ether Heinrich Hertz and Phillip Lenard conducted experiments that made this seem possible On the other hand, English physicists had long posited that there must be a fundamental unit of electricity, a particle that connected matter and electricity The Irish physicist George Johnstone Stoney had even gone so far as to calculate its size and to name it electron 2 French physicist Jean Perrin determined that the cathode rays had negative charges But it was not until English physicist JJ Thomson designed an elegant set of experiments that the electron s existence was proved 3 The rst experiment determined that the negative charge of cathode rays could not be separated from the rays themselves using magnetism The second found that the rays could bend when in uenced by an electric eld The third measured the ratio of charge to mass of the rays by comparing the energy they carried and the amount of de ection possible when an electric eld was introduced Thomson discovered that the ratio was enormous, meaning that the rays were tiny or very highly charged or both 4 His conclusions, published in 1897, were of the existence of a subatomic particle with a negative charge It was not until Thomson s son George proved that electrons, although particles, had many of the properties of a wave, that the mysteries of the cathode ray were truly solved 5 George Thomson s concept of wave-particle duality, the notion that matter and light have properties of both waves and particles, was critical to the development of quantum mechanics It was not a particularly new concept, having roots as far back as Isaac Newton s insistence that light was composed of particles, which he called corpuscles, the very word JJ Thomson used to describe the particles of atoms he found in cathode rays 41 In the context of the passage, the word evacuate refers to A abandoning a location C sending someone away B removing a substance D relinquishing control 42 Which of the following examples is presented as evidence that JJ Thomson s theory about subatomic particles was not new
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A the work of George Johnstone Stoney B the work of George Thomson C the work of Heinrich Hertz D the work of Phillip Lenard
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43 Thomson s rst experiment indicated that A Unlike most rays, cathode rays were negatively charged B Cathode rays could be diverted using electromagnetism C The ray s negative charge was embedded within particles D Most subatomic particles are tiny and highly charged 44 The discussion of corpuscles in the fth paragraph shows primarily that A People in the 1600s understood the parts of an atom B Thomson borrowed a term from a much older theory C Atoms and blood cells are linked by similar structures D Isaac Newton was trained as a medical doctor 45 The statement in the rst paragraph that the discovery of electrons came about in a roundabout way indicates that the author believes that A There is more to discover about electrons B The discovery of electrons did not proceed step-by-step C Electrons could never have been discovered by a single scientist D Scientists ended up at the beginning when they searched for an answer 46 The tone of this passage suggests that the author A considers JJ Thomson a splendid scientist B prefers Isaac Newton to more recent scientists C would like to know more about George Thomson D believes that English scientists surpass the French 47 The author s claim that George Thomson s work was critical to quantum mechanics could best be supported by the inclusion of A the theories of light proposed by Isaac Newton and Christiaan Huygens B experiments showing the results of gravity on light and sound waves C de Broglie s equation relating wavelength to momentum D a de nition of quantum mechanics that mentions wave-particle duality 48 Which of these inventions most relies on wave-particle duality in its everyday workings A a vacuum cleaner C an electron microscope B a high-voltage electric line D a short-wave radio
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