# GCSE Computing - 4 - Representation of data in computer systems

### Description

Flashcards for OCR Computing, section 4 (representation of data in computer systems)
Flashcards by lilymate, updated more than 1 year ago
 Created by lilymate over 9 years ago
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## Resource summary

 Question Answer What is the Base-10 number system known as? Denary What is the Base-2 number system known as? Binary What digits can be used in the binary number system? 0s and 1s What is the binary value 11111111 in denary? 255 How many bits are there in a byte? 8 How many bytes are there in a kilobyte? 1024 How many bits are there in a nibble? 4 What name is given to the unit of data larger than a kilobyte? Megabyte What does 1024 gigabytes equal? 1 terabyte What is the binary value 00101011 in denary? 43 What is the binary value 00010010 in denary? 18 What is the denary value 108 in binary? 01101100 What is the denary value 16 in binary? 00010000 What is the denary value 62 in binary? 00111110 What is the result of this in binary? 00100100 + 00001101 00110001 What is the result of this in denary? 11000101 + 00001100 209 What is the result of this in binary? 11010011 - 10001001 01001010 What is the result of this in denary? 10010101 - 01001011 74 What is the Base-16 number system known as? Hexadecimal What does 'overflow' mean? When a number is too large to fit into the allocated number of bits. Some bits are lost, leaving an incorrect value. What is the denary value 10 in hexadecimal? A What is the hexadecimal value F in denary? 15 What is the binary value 0101 in hexadecimal? 5 What is the denary value 201 in hexadecimal? C9 What is the hexadecimal value F3 in denary? 243 What is the binary value 01001100 in hexadecimal? 4C What is the hexadecimal value 3D in binary? 00111101 What is a character set? The characters available to a computer How many bits does ASCII use for each character? 7 What language is ASCII designed for? English What does ASCII stand for? American Standard Code for Information Interchange How many bits does the Unicode character encoding system use? Up to 32 bits, but it can also use a 16-bit version How many character possibilities does Unicode allow for? More than 4 billion possibilities What is colour depth/bit depth? The number of bits used for each pixel. More bits mean more colours can be represented. What is resolution? The number of pixels per unit, eg. ppi (pixels per inch) What is metadata? Information about the image data which allows the computer to recreate the image from binary data in the file. It must comtain height and width (in pixels) and the colour depth in bpp (bits per pixel) What is the term for sound that continuously varies? Analogue How is analogue sound converted into digital sound? The sound wave is sampled at set intervals and the values are recorded. What is meant by 'sample rate'? The number of times the sound is sampled per second. What is sample rate measured in? Hz (Hertz), eg. 50Hz = 50 samples taken per second What is meant by 'bit rate'? The space available for each second, measured in kilobits per second (kbits/s). For example, 128kbits/s is 128 kilobits per second of sampled sound. What is meant by an 'address'? A location in main memory where data or instructions are stored What two parts is an instruction decoded into? Operator and operand What is meant by the term 'register'? A special fast access part of the CPU, which stores data in use by the CPU What is a program counter? A register in the CPU, which keeps the address of the next instruction What is an operator? Part of an instruction which tells the CPU what to do What is an operand? The part of an instruction what to apply the operation to What is an accumulator? A register in the CPU which stores data currently in use by the CPU

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