Data representation

Question 1

What base is decimal

Answer 1

base 10

Question 2

What base is binary

Answer 2

base 2

Question 3

What base is hexidecimal

Answer 3

base 16

Question 4

Why is hexidecimal often used in computing

Answer 4

because large numbers can be represented in less characters

Question 5

how many bits are in a byte

Answer 5

8

Question 6

How many bytes are in a kilobyte

Answer 6

1024

Question 7

How many kilobytes in a megabyte

Answer 7

1024

Question 8

How many megabytes in a gigabtye

Answer 8

1024

Question 9

How many gigabytes in a megabyte

Answer 9

1024

Question 10

How is bits represented

Answer 10

b

Question 11

How is bytes represented

Answer 11

B

Question 12

How is kilobytes represented

Answer 12

kB

Question 13

How is megabytes represented

Answer 13

MB

Question 14

How is gigabytes represented

Answer 14

GB

Question 15

What happens when you shift a binary number to the left 1

Answer 15

The binary number is timesed by 2

Question 16

What happens when you shift a binary number to the right 1

Answer 16

divided by 2

Question 17

What is binary shifts used for

Answer 17

To times or divide by the powers of 2

Question 18

How manys bits are in an ASCII character

Answer 18

7 bits

Question 19

How manys bits are in an Uncicode character

Answer 19

16 bit

Question 20

How is Unicode and ASCII ordered

Answer 20

They are ordered sytematically alphabeitcally
e.g A=65 B=66

Question 21

How many characters can be represented by ASCII

Answer 21

128

Question 22

What is the advantage of ASCII

Answer 22

• It uses a low amount of data because it only requires 7 bits of data to hold a character

Question 23

What is the disadvantage of ASCII

Answer 23

• As it only stores 128 characters it cannot be used by different languages which use special characters

Question 24

How many characters are stores in unicode

Answer 24

65,536

Question 25

What types of characters can unicode represent

Answer 25

Letters(from all different languages) Mathmatical symobls Emojis

Question 26

What is the advantage of Unicode

Answer 26

It can represent lots of characters (65408 more than ASCII)

Question 27

What is the disadvantage of unicode

Answer 27

It takes up a lot of space as it uses 2 bytes to represent one character

Question 28

How much does unicode and ASCII overlap

Answer 28

The first 127 characters of Unicode are the ASCII characters

Question 29

What is amplitude

Answer 29

- the height of a wave - how loud a sound is

Question 30

What happens when you increace the amplitude of a sound

Answer 30

The volume increaces

Question 31

What is frequency | storing sound

Answer 31

-The distance between waves - The number of waves that occour in time period

Question 32

What happens when you increace the frequency of a sound wave

Answer 32

The sounds pitch becomes lower

Question 33

What is a sound produced naturally called

Answer 33

analogue

Question 34

What part of a computer converts analogue to digital sound

Answer 34

analogue to digital converter (adc)

Question 35

What is a digital sound

Answer 35

A sound that is produced and stored on a computer (non natural)

Question 36

What is sampling

Answer 36

measuring the amplitude of a sound wave at specific time intervals

Question 37

What is sample rate

Answer 37

the number of samples taken per seconds

Question 38

What is sample rate measured in

Answer 38

hertz

Question 39

What is sample resolution

Answer 39

the number of bits used to store a sample of amplitude

Question 40

What is the equation for file size of sound

Answer 40

file size = sampling rate x resolution x time in seconds

Question 41

What is the equation for file size of images in bytes

Answer 41

Size = (width x height x colourdepth in bits)/8 | in bytes

Question 42

What is pixel short for

Answer 42

Picture element

Question 43

What is a Pixel

Answer 43

A single point on an image

Question 44

What is colour depth

Answer 44

The number of bits used to represent each pixel