CBSE-NET (UGC) Library Science (Paper-II & Paper-III): Questions 285 - 291 of 830
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Read the passage given below and answer the question on your understanding of the passage.
Digital devices measure and display discrete quantities. Most clocks for example are analog in nature and have hands that sweep along a continuous scale as do the needles on speedometers Digital clocks, however, display discrete numbers standing for the time. The numbers are either there or they are not, and they click into position virtually instantaneously. In fact, speed and accuracy are distinguishing features of most digital devices, because analog equipment comes in a poor second on both counts. A valid comparison can be made between slide rules, which are analog, and pocket calculators, which are digital.
Accept information in a unitary form, i. e. , letters, symbols and numbers. These may represent anything the computer user wishes. All calculations and processing of the incoming data are done on the digital computer. Thus, all the mathematical rules and functions may be applied and the results are printed out in conventional letters, symbols or numbers. Thus, these are general purpose computers suitable for information processing in general.
“Hybrid” computers have been developed to take advantage of the strength of both analog and digital devices. Typically, analog computers will measure physical quantities such as temperature or pressure and then relay the data to digital computers, which, because of their greater speed and accuracy, can perform statistical computations on the data easily. The output is then displayed in a convenient form for the human beings responsible for conducting or monitoring the operation in question.
Because of their unique capabilities for symbol manipulation, digital computers loom for more important in applied information science than the other types, and it is to them that we shall be referring when we speak of computers from now on.