Fiberscopes are one of the most are one of the most important outcomes of he science of fiber optics. Fibers made of glass and transparent acrylic plastic are capable of conveying light energy, and when thousands of these fibers are combined in what is called a fiberscope, they can transmit images. The most common fiberscopes contain about 750,000 fibers, each 0.001 centimeter, or 10 microns, in diameter. For certain uses, the diameter of the fiber may be as small as 5 microns.Fiberscopes have a wide range of applications. In the medical field, physicians use fiberscopes to examine internal organs and as an aid in delicate surgeries. Miniature probes have also been developed to view muscle fiber, skin tissue, and blood cells. Fiberscopes have also found varied uses in industry, particularly to inspect or control operations in inaccessible areas. Bundles of fiberscopes fused together in a solid plate, called a faceplate, are being used in the manufacture of television tubes and other cathode-ray tube devices.The most far reaching applications of fiber-optic technology are in communication. Optical fibers carry voice messages for telephone service. The sound of the voice is electronically broken down into thousands of pulses per second, which causes a transmitting laser to send coordinated pulses of light through the optical fibers. At the receiving end, the light pulses are converted to electrical signals and the voice message is reconstructed. Light-wave communication systems can handle an immensely greater number of telephone calls and television programs than the current system, and they will form the basis of the “electronic superhighway” expected to crisscross the nation in the near future of the information age.Question 61: How do optical fibers carry voice message?A. By fusing bundles of fiberscopes into a faceplateB. By converting electrical signals to light pulsesC. By sending coordinated electrical pulses through optical fibersD. By using cathode-ray tube devices.Question 62: The word inaccessible in line 9 meansA. difficult to findB. extremely smallC. hard to reachD. impossible to climbQuestion 63: It can be inferred from the passage that fiberscopesA. have more uses in industry than in medicineB. will play a major role in the information ageC. will decrease in importance as they become more commonD. have reached the peak of their developmentQuestion 64: Where in the passage does the author discuss the uses of miniature probes in medicine?A. lines 2-7B. lines 6-8C. lines 14-16D. lines 17-19Question 65: The main topic of the passage isA. The birth of the “electronic superhighway”B. The various applications of fiber-optic technologyC. How fiberscopes have enhanced the field of medicineD. How sound may be transformed into lightQuestion 66: As used in line 18, the word they refers toA. fiberscopes B. light-wave communication systemsC. television programsD. television callsQuestion 67: The word converted in line 15 is closest in meaning toA. transferredB. transformedC. transmittedD. changedQuestion 68: The word coordinated in line 14 is closest in meaning toA. separatedB. organizedC. transformedD. deconstructedQuestion 69:Fiberscopes are being used to do all of the following EXCEPTA. assist in delicate surgeries B. control operations in inaccessible areasC. convert light pulses to electrical signals D. transmit imagesQuestion 70: The passage will most likely be followed by a discussion ofA. homes and businesses of the futureB. the structure of fiberscopesC. additional uses of fiberscope in industryD. the use of fiber optics in the electronic superhighway
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