CIE IGCSE COMPUTER SCIENCE (0478) REVISION EXAM QUESTIONS AND ANSWERS

CIE IGCSE COMPUTER SCIENCE (0478)
REVISION EXAM QUESTIONS AND
ANSWERS
10011011 - Answer-Binary

5 - Answer-Denary

A4 - Answer-Hexadecimal

How many bits in a byte? - Answer-8

How many bytes in a gigabyte? - Answer-1 billion bytes

RGB - Answer-Red, Green, Blue

CMYK - Answer-Cyan, Magenta, Yellow, Key (Black)

Storage of an image - Answer-width x height x bit depth + metadata

Sample Rate - Answer-Amount of samples of sound being taken per second,
determining the accuracy of the sound being played.

Mono - Answer-One channel of sound

Stereo - Answer-Two channels of sound

Surround - Answer-More than two channels of sound

Size of a sound file - Answer-Sample rate (Hz) x bit depth x sound duration (s) x
number of channels + metadata

Odd parity - Answer-Off number of 1s in binary sequence

Even parity - Answer-Even number of 1s in binary sequence

ARQ - Answer-Automatic Repeat reQuest

Encryption - Answer-Process of converting readable data into unreadable characters to
prevent any unauthorised access.

Encryption process of characters - Answer-Plain Text -> Encryption -> Cipher Text ->
Decryption -> Plain Text