IGCSE Computer Science Paper 1 Crossword: 1.3 Data Storage and Compression and 2.1 Data Transmission Types and Methods (Modules 86–109)
Name:
Date:
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Crossword
Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.
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Across
- 2. Reduces an image's resolution or colour depth to shrink the file. Detail is lost for good. Recalculate width x height x depth to see the saving. Word 1 of: _____ image ___________ (5)
- 5. A small piece of a larger file. Data is split into numbered packets so they share the network and a lost ______ can be resent instead of the whole file. (6)
- 8. Word 3 of the term in 1 Down: ___________ saves _______ (7)
- 9. Word 2 of the term in 3 Down: _________ ____ (4)
- 10. Lowering the sample rate or sample resolution of a ______ so it needs fewer bits. The file gets smaller, but the lost ______ detail can never be recovered. Word 2 of: _____ _____ ___________ (5)
Down
- 1. Compressed files are smaller, so they take up less ______ space. This means more photos or songs fit on a device, and less ______ needs to be bought. Word 1 of: ___________ saves _______ (11)
- 3. Data removed by lossy compression is gone for good, so the original quality cannot be restored. Keep the original file, as re-saving or compressing again only lowers quality further. Word 1 of: _________ ____ (9)
- 4. Lossy makes smaller files but permanently removes data; ______ keeps all data so the original can be restored, but saves less space. Word 3 of: _____ vs ________ (8)
- 6. Run-length encoding of a pixel ______ stores each run of same-coloured pixels as a count then a colour code, in order along the ______. E.g. WWWBB becomes 3W2B. Word 3 of: RLE pixel ___ (3)
- 7. Repeat each colour code count times along the row to rebuild the pixels, e.g. 3R2B gives RRRBB. Then check the row adds up to the image width. Word 2 of: RLE ______ (6)
Answer Key
IGCSE Computer Science Paper 1 · Modules 86–109
1C
2L
O
S
S
Y
M
3P
4L
5P
A
C
K
E
T
O
R
R
S
E
6R
M
7D
S
8S
T
O
R
A
G
E
9L
O
S
S
W
N
C
E
I
E
O
S
O
N
D
10S
O
U
N
D
T
E
Across
2LOSSY — Reduces an image's resolution or colour depth to shrink the file. Detail is lost for good. Recalculate width x height x depth to see the saving. Word 1 of: _____ image ___________
5PACKET — A small piece of a larger file. Data is split into numbered packets so they share the network and a lost ______ can be resent instead of the whole file.
8STORAGE — Word 3 of the term in 1 Down: ___________ saves _______
9LOSS — Word 2 of the term in 3 Down: _________ ____
10SOUND — Lowering the sample rate or sample resolution of a ______ so it needs fewer bits. The file gets smaller, but the lost ______ detail can never be recovered. Word 2 of: _____ _____ ___________
Down
1COMPRESSION — Compressed files are smaller, so they take up less ______ space. This means more photos or songs fit on a device, and less ______ needs to be bought. Word 1 of: ___________ saves _______
3PERMANENT — Data removed by lossy compression is gone for good, so the original quality cannot be restored. Keep the original file, as re-saving or compressing again only lowers quality further. Word 1 of: _________ ____
4LOSSLESS — Lossy makes smaller files but permanently removes data; ______ keeps all data so the original can be restored, but saves less space. Word 3 of: _____ vs ________
6ROW — Run-length encoding of a pixel ______ stores each run of same-coloured pixels as a count then a colour code, in order along the ______. E.g. WWWBB becomes 3W2B. Word 3 of: RLE pixel ___
7DECODE — Repeat each colour code count times along the row to rebuild the pixels, e.g. 3R2B gives RRRBB. Then check the row adds up to the image width. Word 2 of: RLE ______