Flashcards
flashcards-data representation
Cards in this deck (19)
- 1what does lossy compression do?Removes data so that the file size is smaller
- 2what does lossless compression do?reduces the whole file size without removing data
- 3when adding binary what does 0+0=0
- 4when adding binary what does 0+1=1
- 5when adding binary what does 1+1=0 carry a 1
- 6when adding binary what does 1+1+1=1 carry a 1
- 7when you do a right shift of 2 what are you dividing by?4
- 8when you do a left shift of 1 what are you multiplying by?2
- 9why do people use hexadecimal rather than binary?hexadecimal is a lot shorter than binary.
hexadecimal is less susceptible to error. - 10What is a character set?the total list of characters available.
- 11how many bits does ascii use?7 bits
- 12how many its does extended ascii use?8 bits
- 13how many bits does unicode use?10 bits
- 14what is used for a mobile phone that uses emojis? ascii, extended ascii or unicode?unicode
- 15why is unicode used?it uses more bits so more characters are available
- 16how do you calculate a file size?number of pixels in width X number of pixels in height X colour depth
- 17how do you calculate the resolution of an image?number of pixels in width X number of pixels in height
- 18what is metadata?metadata is data about the image data
- 19what order does: terabyte, gigabyte, petabyte, nibble, megabyte, bit, byte and kilobyte go in smallest to largest?bit
nibble
byte
kilobyte
megabyte
gigabyte
terabyte
petabyte
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- Year 10 Computing Flashcards on flashcards-data representation, created by Amy Riley on 20/10/2016.
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- Amy Riley
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