Unit 1 - Digital Data Flashcards
define Data
raw facts and figures
define Information
data that has been processed
What does it mean by processing?
searching, sorting, validation, conversion, analysis & calculation
What is a ‘bit’ short for? Define and give an example
Binary Digit. It’s the smallest unit of data that can be stored by a computer. 1 or 0.
How many bits are there in a nibble
4
How many bits does a byte have? Explain what a byte can be and give an example
- A single keyboard character e.g. letter A
Order of Units of storage smallest to largest
bit, nibble, byte, kilobyte, megabyte, gigabyte, terabyte
define Data type
a general classification of data that tells the computer how the programmer intends to use the data
State 5 data types
numeric, date/time, character, string, boolean
Numeric data type: Integer and Real
Integer is a whole number and a Real numeric is a number that contains a decimal point
Date/Time data type
a date or time can be stored
Character data type
a single alphanumeric character
String data type
a series of alphanumeric characters
Boolean data type
true or false
What’s a commonly used character set for storing Characters?
ASCII - American Standard Code for Information and Interchange
What’s Unicode?
the new standard for representing characters of all the languages in the world. It can represent 2^16 unique characters
The word “pixel” is made up of?
picture and element
define Pixel
smallest unit of an image that can be changed. Basically a tiny block of colour that a computer uses to build up an image.
What do you call an image made up of pixels?
bitmap image (as it uses a ‘map’ of where the ‘bits’ of information are stored)
What’s the Resolution of an image
the number of pixels used in an image
What happens if we adjust the image resolution high in a bitmap image
high quality images and more storage space needed
Vector graphics use?
lines, curves and shapes
state 3 features of a Vector image
can be resized very easily, stretched without losing the quality of an image, image quality doesn’t depend on resolution
Give an example of each: bitmap and vector graphics
bitmap - photographs
vector - diagrams
