GCSE CS Data Quiz 4 (Compression and Encryption)

1. 1How many bits are in a byte ?

   1. A1024
   2. B1000
   3. C8
   4. D256
   5. E1
2. 2how may MB's are in 576000000 bits ?

   1. A5.7
   2. B6.8
   3. C7.2
   4. D6.1
3. 3What type of compression is a JPG image?

   1. ALossy compression
   2. BLossless compression
   3. CRLE
4. 4What type of compression would you use for a Text file ?

   1. ARLE
   2. BLossless
   3. CLossy
5. 5Why do you need to use compression ?

   1. Aless bandwidth needed
   2. Bless storage needed
   3. Csmaller files
   4. DCan stream content
6. 6A RLE ( run-length encoding) is a lossless compression algorithm, run a REL on the below image.

   

   1. A6b
   2. B3b3w
   3. C3w3b
   4. D3b3w
   5. E6b
7. 7Encryption is used to scramble data so that it is un-readable to use without the key. Asymmetric encryption uses one key to decrypt and encrypt data.

   1. ATrue
   2. BFalse
8. 8The following message is encrypted using a Caeser Cipher using a right shift of 3.
   ZLJMRQBO
   what does the message say?

   1. AAQORWRPU
   2. BCOMPUTER
   3. CDESKTOPS
   4. DLAPTOPS

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Quiz on GCSE CS Data Quiz 4 (Compression and Encryption), created by Simon Howe on 16/03/2018.

Author

Simon Howe

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