IGCSE Computer Science Paper 1 Word Scramble: 1.2 Text, Sound and Images and 1.3 Data Storage and Compression (Modules 43–58)
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Word scramble
Unscramble the letters and write each key term on the line.
1
OUIEDNC SV ICAIS
Unicode supports far more characters than 8-bit ASCII but uses 16 or 32 bits per character, so the same text takes up more storage space.
2
LGAEOANU OT AGIDITL
A sound wave is analogue: its amplitude changes smoothly. A computer stores only separate binary numbers, so the wave a microphone captures must be converted into discrete digital values.
3
MLSAPE ERLOISTNOU
The number of bits used to store each sample of a sound. More bits give more possible volume levels and a more accurate recording. 16 bits per sample is common.
4
LOCORU TDPHE
The number of bits used to store the colour of each pixel. More bits per pixel means more possible colours, such as 1 bit for 2 colours or 24 bits for true colour.
5
RUSOCLO = N^2
A colour depth of n bits gives 2^n different colours, so each extra bit doubles the number. For example, 2 bits give 4 colours and 8 bits give 256 colours.
6
OULCRO EDOC ABLET
A table giving each colour a binary code. Write each pixel's code row by row to encode an image; read the codes back to redraw it. 4 colours need 2 bits.
7
ROFTF-AED
Balancing quality against file size: pick the lowest sample rate, resolution or colour depth that still looks or sounds good enough, so the file stays small enough to store or send.
8
BILEBN
A ______ is a group of 4 bits, so half a byte. Two nibbles make 1 byte. One hexadecimal digit fits exactly in one ______.
Answer Key
IGCSE Computer Science Paper 1 · Modules 43–58
1OUIEDNC SV ICAIS → Unicode vs ASCII — Unicode supports far more characters than 8-bit ASCII but uses 16 or 32 bits per character, so the same text takes up more storage space.
2LGAEOANU OT AGIDITL → analogue to digital — A sound wave is analogue: its amplitude changes smoothly. A computer stores only separate binary numbers, so the wave a microphone captures must be converted into discrete digital values.
3MLSAPE ERLOISTNOU → sample resolution — The number of bits used to store each sample of a sound. More bits give more possible volume levels and a more accurate recording. 16 bits per sample is common.
4LOCORU TDPHE → colour depth — The number of bits used to store the colour of each pixel. More bits per pixel means more possible colours, such as 1 bit for 2 colours or 24 bits for true colour.
5RUSOCLO = N^2 → colours = 2^n — A colour depth of n bits gives 2^n different colours, so each extra bit doubles the number. For example, 2 bits give 4 colours and 8 bits give 256 colours.
6OULCRO EDOC ABLET → colour code table — A table giving each colour a binary code. Write each pixel's code row by row to encode an image; read the codes back to redraw it. 4 colours need 2 bits.
7ROFTF-AED → trade-off — Balancing quality against file size: pick the lowest sample rate, resolution or colour depth that still looks or sounds good enough, so the file stays small enough to store or send.
8BILEBN → nibble — A nibble is a group of 4 bits, so half a byte. Two nibbles make 1 byte. One hexadecimal digit fits exactly in one nibble.