Data Compression MCQ Based Question Set-1 | Data Compression by Rtsall DC Practice Set-1Welcome to your Data Compression MCQ Based Question Set-1 | Data CompressionNote: If you can find any error regarding the quiz and its answer, please mention it in the comment box.Data Compression Quiz Practice Set-1: Click Here Data Compression Quiz Practice Set-2:- Click Here 1Which of the following would not be suitable for Lossy Compression? Text Speech Image Video 2Composite source models is a combination or composition of several sources. In which how many source being active at any given time? Only first three Only one None of these All 3Based on the requirements of reconstruction, data compression schemes can be divided into broad classes 4 5 3 2 4Suppose storing an image made up of a square array of 256×256 pixels requires 65,536 bytes. The image is compressed and the compressed version requires 16,384 bytes. Then the compression ratio is 1:4 4:1 1:2 2:1 5The unit of information depends on the base of the log. If we use log base 2, the unit is_____; if we use log base e, the unit is____; and if we use log base 10, the unit is ____. Bits, nats, hartleys Hartleys, nats, bits Bits, hartleys, nats Hartleys, bits, nats 6The prefix code is also called as Instantaneous code Convolutional code Parity code Block code 7Which of the following compression type is supported by SQL Server 2014? Column Both row and column None of the mentioned Row 8Data compression and encryption both work on binary True False 9Data compression means to the file size. None of the above Decrease Increase Can’t say 10The development of data compression algorithms for a variety of data can be divided into 4 3 5 2 11Which of the following are not in a compressed format? Bitmap MPEG MP3 JPEG 12What is compression? To compress something by pressing it very hardly To convert one file to another To reduce the size of data to save space To minimize the time taken for a file to be downloaded 13Why data compressed? c. To reduce packet congestion on networks a. To optimize the data b. To reduce secondary storage space d. Both (B) and (C) 14Which of the following is true of lossy and lossless compression techniques? Lossless compression is only used in situations where lossy compression techniques can’t be used Lossy compression is best suited for situations where some loss of detail is tolerable, especially if it will not be detectable by a human Neither lossy nor lossless compression can actually reduce the number of bits needed to represent a file Both lossy and lossless compression techniques will result in some information being lost from the original file 15compression is the method that eliminates the data which is not noticeable and ____ compression does not eliminate the data which is not Lossless, lossy None of these Lossy, lossless 16Lossy techniques are generally used for the compression of data that originate as analog signals, such as None of these Both Speech & Video Speech Video 17A code in which no codeword is a prefix to another codeword is called as Convolutional code Parity code Block code Prefix code 18According to Claude Elwood Shannon’s second theorem, it is not feasible to transmit information over the channel with error probability, although by using any coding technique? Small Large May be large or small Unpredictable 19The essential condition/s for a good error control coding technique? Faster coding & decoding methods All of the above Better error-correcting capability Maximum transfer of information in bits/sec 20Compression is generally used for applications that cannot tolerate any difference between the original and reconstructed data. Lossy None of these Both Lossless 21The set of binary sequences is called a____, and the individual members of the set are called_____. Code, codewords Codewords, code None of these 22Markov model is often used when developing coding algorithms for Image Speech Both None of these 23Point out the correct statement: The details of data compression are subject to change without notice in service packs or subsequent releases All of the mentioned Compression is not available for system tables If you specify a list of partitions or a partition that is out of range, an error will be generated 24For models used in lossless compression, we use a specific type of Markov process called a Constant time Markov chain Discrete-time Markov chain None of the above Continuous-time Markov chain 25Data compression usually works by . Deleting random bits of data Finding repeating patterns 26Full form of ASCII is American Standard Code for Information Interchange American Standard Code for Information Intercaste American System Code for Information Interchange American Standard Codewords for Information Interchange 27Which of the following are Lossless methods? Huffman Lempel Ziv Run-length All of the above 28If fidelity or quality of reconstruction is____, then the difference between the reconstruction and the original is____ . High, high Small, small None of the above High, small 29Information theory was given by Claude Elwood Shannon Claude Debussy Claude von Regan Claude Monet 30Which is a type of data compression? Inputting Resolution Zipping Caching 31What is compression ratio? The ratio of the number of bits required to represent the data before compression to the number of bits required to represent the data after The ratio of the number of bits required to represent the data before reconstruction to the number of bits required to represent the data after The ratio of the number of bits required to represent the data after compression to the number of bits required to represent the data before The ratio of the number of bits required to represent the data after reconstruction to the number of bits required to represent the data before 32Self information should be . Negative Positive None of these Both 33In which type of Data Compression, the integrity of the data is preserved? Lossless Compression Lossy Compression None of the above Both of the above 34Data compression involves Reconstruction only Compression only Both compression and reconstruction None of the above Time is Up! Time's up

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