1.2.4

Question 1

binary shifts

Answer 1

shift 1 to the left is the same as multiplying by two

Question 2

character set

Answer 2

defined list of characters recognised by computers

Question 3

why do we use binary codes to represent characters?

Answer 3

computers communicate in binary and all instructions are represented by strings of 1s and 0s

Question 4

ASCII

Answer 4

uses 7-bit and can form 128 characters

Question 5

Unicode

Answer 5

uses 16-bit and can form 65,536 characters

Question 6

sample

Answer 6

measure of amplitude at a specific time

Question 7

sample rate

Answer 7

number of samples taken per second

Question 8

bit depth

Answer 8

number of bits used for each sample

Question 9

factors affecting the size and quality of a file

Answer 9

-number of times sound is sampled each second
-higher the sample rate = more accurate sound
-bit depth, number of bits per sample
-length of the sound

Question 10

file size =

Answer 10

file size = sample rate x bit depth x seconds

Question 11

bitmap

Answer 11

page is divided into an invisible grid and each pixel is assigned a colour

Question 12

vector

Answer 12

based on mathematical formulas

Question 13

resolution

Answer 13

number of pixels per square inch

Question 14

colour depth

Answer 14

number of bits used to encode the colour of each pixel

Question 15

the greater the colour depth…

Answer 15

more data needs to be stored

Question 16

colour depth of 3 allow…

Answer 16

2^3 colours to be stored