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  I NTRODUCTION TO N UMBER SYSTEMS -   Q  UESTIONS   For each of the following questions, write some brief notes to answer the question as fully as possible. 1.   What is a bit? A binary digit that is written as either 0 or 1. 2.   What is a byte? A group of (usually) 8 bits. 3.   What is a word? A group of bytes. 4.   What is a character set? The group of characters recognised by the computer/operating system. Each character is assigned a unique code. There are three main character sets that are in use: ASCII, UNICODE, EBCDIC. 5.   How are parity bits used in conjunction with an ASCII character set? One of the bits is within an ASCII character set is used to perform a parity check. A parity check is a form of error checking.  6.   Explain why an ASCII character set would not be suitable for a UK based computer system. 7.   Explain why should web pages usually be encoded using a UNICODE character set? T HE B INARY AND D ENARY SYSTEMS   1.   What is the denary number system? 2.   What is the binary number system? 3.   For each of the following denary numbers, write out their binary equivalents as 8-bit bytes , remember to show your working when you make these conversions: a.   5 b.   13  c.   15 d.   44 e.   80
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