question archive (a) The magnitude of a number can be determined using three parameters
Subject:Computer SciencePrice: Bought3
(a) The magnitude of a number can be determined using three parameters. Using Examples, describe the three parameters. (3 marks)
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Using twos complement, show how the arithmetic below would be carried out ona 8 bit computer system.
(+54) (+29). (5 marks)
(c) Using ones complement, perform the following binary arithmetic leaving the answer in decimal notation. (5 marks)
11012 - 1001012
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(d) Differentiate between a word and a word length as used in data representation. (2 marks)
(a) Write down the three letter file name extensions (e.g sys) that are normally associated with the following file type.
A simple ASCII text file. (1 mark)
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A Microsoft word document. (1 mark)
A digital photograph (1 mark)
A Microsoft power point presentation (1 mark)
A bit mapped image. (1 mark)
A scanner is quite a useful input device. Describe three useful tasks which a scanner
can fulfill. (3 marks)
(c) Describe two types of scanner that are used for inputting data into a computer. (4marks)
(i) Previously scanners were connected to a computer via the parallel port,
but this has be replaced by USB. Briefly explain the difference between
these two ports. (2marks)
(ii) Explain why USB has been preferred over parallel port. (1 mark)
.
(a) Differentiate between the following characteristics of a system:
(i) Hard system and Soft system. (2marks)
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(ii) Boundary and Environment. (2marks)
(iii) Open and Closed system. (2marks)
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(b) Define the following terms as used in system development.
(i) System Entropy (1 mark)
.
(ii) System feedback. (1 mark)
(c) State two advantages and two disadvantages of using interview as a method of
data collection.
Advantages. (2 marks)
Disadvantages. (2 marks)
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Under what circumstances would a questionnaire be best suited for data
collection. (3 marks)
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(a) List two devices used in wireless communication. (2marks)
(b) Explain the following communication devices:
(i) Hubs. (1 mark)
.
(ii) Modem (1 mark)
(iii) Codec (1 mark)
(iv) Bridge (1 mark)
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(c) Describe the following terms with respect to data communication.
(i) Bandwidth (1 mark)
(ii) Attenuation (1 mark)
(d) Distinguish between videotex and teletext. (2marks)
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(i) What is virtual reality? (1 mark)
(ii) Explain four uses of virtual reality.