What is hexadecimal?
Number system using digits 0-9 and A-F
What is a bit?
Single binary digit 0 or 1
What is a byte?
8 bits
What is character encoding?
Method of storing text in binary
Give examples of character encoding?
ASCII Unicode
What is ASCII?
7 or 8-bit code representing characters
What is Unicode?
Encoding supporting characters from multiple languages
How is an image represented?
As a grid of pixels with color values
What is resolution?
Number of pixels in an image
What is color depth?
Number of bits per pixel
How is sound represented?
Sampled and converted to binary values
What is sample rate?
Number of sound samples taken per second
What is file size calculation?
Resolution × color depth or sample rate × duration
What is compression?
Reducing file size
What is lossy compression?
Data lost but smaller file size
What is lossless compression?
All original data retained
What is integer representation?
Storing whole numbers in binary
What is two’s complement?
Method for representing negative numbers in binary
What is overflow?
Number too large to fit in given bits
What is hexadecimal used for?
Simplifying binary representation
What is binary arithmetic?
Adding subtracting multiplying dividing in binary
What is floating point?
Binary representation of decimals
Why is data representation important?
Computers can only process data such as texts, images and sound in the form of binary. Because of this, data has to be converted to binary so it can be processed, stored and transmitted.
What does a left shift do?
Multiplies the binary number and moves them all one to the left and a zero is added on the right. E.g. 1100, 1000
-
Systems Architecture (CPU, FDE cycle, Embedded systems)22
-
Memory and Storage34
-
Computer Networks29
-
Network Threats25
-
Systems Software29
-
Ethical, Cultural and Environmental Issues31
-
Algorithms19
-
Programming Fundementals27
-
Robust Programming28
-
Boolean Logic26
-
Data Representation25
-
Programming Languages and Translators17
