Units and data representation

Question 1

what is the smallest unit a computer can work with and what states can they be

Answer 1

A bit
1 (On) or 0 (Off)

Question 2

What is 8 bits called and what is 4 bits called

Answer 2

A byte
A nibble

Question 3

how much is 1000 bytes And how much is 1000 kilobytes

Answer 3

1 kilo byte
1 megabyte

Question 4

How to remember the order of the bytes and how much of the previous unit is needed to move on to the next

Answer 4

Burger King Makes great toast pan (Byte,Kilo,Mega,Tera,Peta)
1000 units

Question 5

What is Analogue data and give examples

Answer 5

Real life signal that can vary greatly in data examples include:
sound Pressure light temperature

Question 6

What is digital data

Answer 6

Digital data is the data computers use that is made from analogue data

Question 7

How would you convert to digital data from analogue and how would you convert back

Answer 7

Use a Analogue digital converter
Use a digital analogue converter

Question 8

How to calculate how many music files (6MB) would fit on a 1 GB USB

Answer 8

1GB = 1,000 MB
1000/6 = 166
1666 files

Question 9

How to Convert a Binary number to deanery

Answer 9

Add up all the On switches in each place value

Question 10

How to convert binary to hex +Convert 10011010 into Hexadecimal

Answer 10

154
to convert a 8 bit number to deanery first you must separate it into nibbles then you must figure out the total amount in each nibble. Then simply write the number it equal to or if its higher than 9 use letters
9A

Question 11

How is each place value represented in HEX

Answer 11

Power of 16

Question 12

What are the 1st 4 Hex place values and what is 513 in HEX place values

Answer 12

65,535 4,096 256 16 1
2 1

Question 13

How to Multiply/divide Binary Number By: 2,4,8

Answer 13

Multiply/divide 2 move binary place value by 1 left/right
Multiply/divide 3 move binary place value by 2 left/right
Multiply/divide 4 move binary place value by 3 left/right

Question 14

What are the common Character sets

Answer 14

ASCII
Unicode

Question 15

How many Bits Are ASCII and UNICODE and how much characters can they hold

Answer 15

7 Bits PC 128 characters
16 Bits PC over 65,000

Question 16

What is The Denary number range for Capital and lowecase letters (ASCII)

Answer 16

65-90 - A-Z
97-122 a-z

Question 17

How is Extended ASCII different from ASCII

Answer 17

8 BITS
256 characters including special characters like accents

Question 18

What is Colour depth what is a 2 bit colour depth capable of

Answer 18

Tells Us the range of colour range available
4 colours

Question 19

What is Resolution what is it recorded in how much pixels are in a Image with a DPI of 72

Answer 19

Resolution is the pixel density in an image
recorded in DPI (Dots per Inch)
72DPI=5184 pixels

Question 20

What is Metadata and give examples

Answer 20

Metadata- Data about data
Resolution Bit depth date taken
location

Question 21

How to estimate Image file size and what is the file size of a image with a height of 200 and width 400 and colour depth of 16

Answer 21

200 X 400 = 80,000 X 16 = 1,280,000 / 8 = 160,000 bits
160,000 / 1000 = 160 KB

Question 22

How are sounds digitised and what is this unit called

Answer 22

ADC will capture a sound wave at regular time intervals Sample

Question 23

What is a sample rate and what is it measured in

Answer 23

Sample rate (HZ) Number of samples per second

Question 24

What is bit depth

Answer 24

Bit depth = Number of bits used per sample

Question 25

What is bit rate an how is it calculated

Answer 25

How much data is processed in each second of sound
Sample rate X Bit depth

Question 26

What is a lossy compression and give examples

Answer 26

some Data is removed and discarded such as colour depth

JPEG,MPEG,MP3

File size reduced greatly

Question 27

What is loseless compression name examples and how does it work

Answer 27

Files reduced in size without loss of data but not that much

PDF - text
GIF - Image

Question 28

Give a method of Loseless compression and how does it work

Answer 28

Run length encoding (RLE)

00000011111111000000 becomes 608160

since there are six 0 then it become 60 at the begining and so on