IGCSE Computer Science Paper 1 Word Scramble: 1.3 Data Storage and Compression and 2.1 Data Transmission Types and Methods (Modules 86–109)
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Word scramble
Unscramble the letters and write each key term on the line.
1
IATSSSONNMIR EMTI
The time a file takes to upload, download or send. A smaller compressed file has a shorter ______, so downloads, email attachments and web pages are quicker.
2
RAEMPTNEN SSLO
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.
3
ELR IPLEX OWR
Run-length encoding of a pixel row stores each run of same-coloured pixels as a count then a colour code, in order along the row. E.g. WWWBB becomes 3W2B.
4
LRE EDOEDC
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.
5
YLSSO SV OLSLSSES
Lossy makes smaller files but permanently removes data; lossless keeps all data so the original can be restored, but saves less space.
6
EKAPCT
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.
Answer Key
IGCSE Computer Science Paper 1 · Modules 86–109
1IATSSSONNMIR EMTI → transmission time — The time a file takes to upload, download or send. A smaller compressed file has a shorter transmission time, so downloads, email attachments and web pages are quicker.
2RAEMPTNEN SSLO → permanent loss — 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.
3ELR IPLEX OWR → RLE pixel row — Run-length encoding of a pixel row stores each run of same-coloured pixels as a count then a colour code, in order along the row. E.g. WWWBB becomes 3W2B.
4LRE EDOEDC → RLE decode — 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.
5YLSSO SV OLSLSSES → lossy vs lossless — Lossy makes smaller files but permanently removes data; lossless keeps all data so the original can be restored, but saves less space.
6EKAPCT → packet — A small piece of a larger file. Data is split into numbered packets so they share the network and a lost packet can be resent instead of the whole file.