OCR Computer Science Paper 1 Revision

What is a character set

• The symbols a computer can represent

• All the different characters a computer can represent

• Hex Letters

• A table of codes

The maximum number of characters ASCII can represent are:

• 256

• 128

• 8

• 255

Each ASCII Character is represented by how many bits

• 16

• 4

• 1

• 8

Which shift should be used to multiply ?

• Left

• Right

The following will affect the speed of a computer

• Monitor resolution

• Clock Speed

• Size Of Hard Drive

• Cycles executed per second

The accumulator

• Stores the address

• Stores the result of arithmetic operations

• Increments after each cycle

• performs calculations

Each colour in an image has a unique binary code

• True

• False

The sample rate is

• Number of samples collected in a song

• the number of times the amplitude is recorded per second

• The number of binary codes per sound

• points in a wave

A small bit depth means

• bad quality sound

• Size of the sound is small

• a smaller range of sounds are recorded

• a large range of sounds are recorded

Compression ...

• takes up less space on the server

• reduces the size of a file

• keeps the file the same

• allows faster uploads and downloads