Representation of data in computer systems

Question 1

define the terms bit, nibble, byte, kilobyte, megabyte, gigabyte, terabyte

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Question 2

what format does data need to be converted into in order to be processed by a computer

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Question 3

convert positive denary whole numbers (0-255) into 8-bit binary numbers and vice versa

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Question 4

add two 8-bit binary integers and explain overflow errors which may occur

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Question 5

convert positive denary whole numbers (0-255) into 2-digit hexadecimal numbers and vice versa

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Question 6

convert between binary and hexadecimal equivalents of the same number

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Question 7

explain the use of hexadecimal numbers to represent binary numbers.

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Question 8

explain the use of binary codes to represent characters

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Question 9

explain the term character set

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Question 10

describe with examples (for example ASCII and Unicode) the relationship between the number of bits per character in a character set and the number of characters which can be represented.

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Question 11

explain the representation of an image as a series of pixels represented in binary

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Question 12

explain the need for metadata to be included in the file such as height, width and colour depth

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Question 13

discuss the effect of colour depth and resolution on the size of an image file.

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Question 14

explain how sound can be sampled and stored in digital form

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Question 15

explain how sampling intervals and other considerations affect the size of a sound file and quality of its playback.

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Question 16

explain how instructions are coded as bit patterns

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Question 17

explain how the computer distinguishes between instructions and data.

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