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| Question | Answer |
| what does lossy compression do? | Removes data so that the file size is smaller |
| what does lossless compression do? | reduces the whole file size without removing data |
| when adding binary what does 0+0= | 0 |
| when adding binary what does 0+1= | 1 |
| when adding binary what does 1+1= | 0 carry a 1 |
| when adding binary what does 1+1+1= | 1 carry a 1 |
| when you do a right shift of 2 what are you dividing by? | 4 |
| when you do a left shift of 1 what are you multiplying by? | 2 |
| why do people use hexadecimal rather than binary? | hexadecimal is a lot shorter than binary. hexadecimal is less susceptible to error. |
| What is a character set? | the total list of characters available. |
| how many bits does ascii use? | 7 bits |
| how many its does extended ascii use? | 8 bits |
| how many bits does unicode use? | 10 bits |
| what is used for a mobile phone that uses emojis? ascii, extended ascii or unicode? | unicode |
| why is unicode used? | it uses more bits so more characters are available |
| how do you calculate a file size? | number of pixels in width X number of pixels in height X colour depth |
| how do you calculate the resolution of an image? | number of pixels in width X number of pixels in height |
| what is metadata? | metadata is data about the image data |
| what 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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