Data Representation

Question 1

What is a bit?

Answer 1

The smallest measure of data.

Question 2

How many bits are in a nibble?

Answer 2

4

Question 3

How many bits are in a byte?

Answer 3

8

Question 4

How many bytes are in a kilobyte?

Answer 4

1000

Question 5

How many kilobytes are in a megabyte?

Answer 5

1000

Question 6

How many megabytes are in a gigabyte?

Answer 6

1000

Question 7

What is binary?

Answer 7

A number system which uses only two numbers: 1 and 0. It is what all computers use.

Question 8

Binary increases in what power?

Answer 8

Power of 2 (1, 2, 4, 8, 16, 32, 64 and 128)

Question 9

In binary, what results from 0+0?

Answer 9

0+0=0

Question 10

In binary, what results from 1+0?

Answer 10

1+0=1

Question 11

In binary, what results from 1+1?

Answer 11

1+1=10

Question 12

What direction is the binary shifted when multiplying?

Answer 12

Left

Question 13

What direction is the binary shifted when dividing?

Answer 13

Right

Question 14

How many digits can Hexadecimal use?

Answer 14

16 (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F)

Question 15

How do you convert binary to Hex?

Answer 15

Split the binary code into nibbles. Find out the numerical value of each nibble. If it is over 9, it will be a letter from A-F in alphabetical order.

Question 16

How do you convert Hex to Denary?

Answer 16

Multiply each digit by 16 and add the results

Question 17

What is a character?

Answer 17

A number, letter or symbol.

Question 18

What are the two main character sets?

Answer 18

ASCII and Unicode

Question 19

What does ASCII stand for?

Answer 19

American Standard Code for Information Interchange

Question 20

What language is ASCII?

Answer 20

English

Question 21

How many bits are used per character in ASCII?

Answer 21

7 bits

Question 22

How many different characters are in ASCII?

Answer 22

128

Question 23

What is Unicode?

Answer 23

A character set containing international characters.

Question 24

How do you work out the size of a text file?

Answer 24

Bits per character x number of characters

Question 25

What are bitmap images made of?

Answer 25

Pixels

Question 26

What are pixels?

Answer 26

Tiny dots that images are made of.

Question 27

How is the colour of each pixel represented?

Answer 27

Binary code

Question 28

How many bits per pixel do black and white images need?

Answer 28

1 bit

Question 29

How many colours can 2 bit images be made of?

Answer 29

4 colours - 00, 01, 10, 11

Question 30

How does increasing the amount of bits per pixel affect an image?

Answer 30

Increases the range of colours

Question 31

What is bits per pixel known as?

Answer 31

Colour depth

Question 32

How do you work out the range of colours based on colour depth?

Answer 32

2^n (n = number of bits per pixel)

Question 33

What is image resolution?

Answer 33

Number of pixels in an image

Question 34

How does resolution affect image quality?

Answer 34

The higher the resolution, the more pixels, the higher the quality

Question 35

How do you work out the file size (in bits) of an image?

Answer 35

File size = image resolution x colour depth

Question 36

What is metadata?

Answer 36

Data about data

Question 37

What sort of information does metadata include?

Answer 37

File format, colour depth, resolution, height and width

Question 38

What are vector images?

Answer 38

Images made of blocks of colour, stored as maths equations

Question 39

What does a microphone record sound as?

Answer 39

An analogue signal

Question 40

What are analogue signals pieces of?

Answer 40

Continually changing data