2

Question 1

ASCII

Answer 1

• The character encoding system which assigns numeric values to textual data

Question 2

Logical shift

Answer 2

• Replaces all the spaces with 0s

Question 3

Arithmetic left shift

Answer 3

• Exactly the same as logical shift - fill in the spaces with 0s

Question 4

Arithmetic right shift

Answer 4

• Moves each position to right but fills in spaces with 1s

Question 5

Hexadecimal

Answer 5

• Number system designed to help humans handle large binary numbers

Question 6

Pixel

Answer 6

• Picture element - a single block of colour that makes up an image

Question 7

Size of bitmap image

Answer 7

• Length x width

Question 8

Resolution

Answer 8

• Pixels per inch

Question 9

Colour depth

Answer 9

• Number of bits used to encode the colour of each pixel

Question 10

File size of image

Answer 10

• Width x height x colour depth

Question 11

Sampling rate

Answer 11

• Number of sound samples per second

Question 12

Bit depth

Answer 12

• The number of bits used to encode each sound sample

Question 13

File size of sound file

Answer 13

• Sample rate x bit depth x duration

Question 14

Compression

Answer 14

• Algorithms that reduce file size by repackaging or removing some of their data

Question 15

Lossless + file formats

Answer 15

• Reduces file size while retaining the exact meaning of the originial data - identifies and removed redundant data i.e. reoccuring text that can be put back in
• PNG for images
• FLAC for audio
• ZIP for archiving

Question 16

Lossy data + file formats

Answer 16

• Permanently deletes some of the data that is not needed (as it makes no different to our eyes)
• JPEG for images
• MP3 for sound files