Topic 1.2 Part 2 - Units and Data Representation

Question 1

How many bits in a byte?

Answer 1

8

Question 2

How many bits in a nibble

Answer 2

4

Question 3

What does 0 mean in binary

Answer 3

Off

Question 4

What does 1 mean in binary

Answer 4

On

Question 5

How many bytes in a kilobyte

Answer 5

1000

Question 6

How many bytes in a megabyte?

Answer 6

1 million

Question 7

How many bytes in a gigabyte?

Answer 7

1 billion

Question 8

How many bytes in a terabyte?

Answer 8

1 trillion

Question 9

How many bytes in a petabyte?

Answer 9

1 quadrillion

Question 10

00000101 =

Answer 10

5

Question 11

01000001 =

Answer 11

65

Question 12

11111111 =

Answer 12

255

Question 13

Why is binary easier for a computer?

Answer 13

It is easier to represent only two states on electrical devices

Question 14

LSB means

Answer 14

Least Significant Bit

Question 15

the LSB =

Answer 15

1

Question 16

MSB Means

Answer 16

Most Significant Bit

Question 17

The MSB is

Answer 17

the highest value on your conversion table

Question 18

Overflow

Answer 18

Can’t fit on the 8 bit, one is added at the left end

Question 19

Underflow

Answer 19

Can’t fit on the 8 bit, one is added onto the right end

Question 20

In binary 1 + 1 = ?

Answer 20

10

Question 21

One left shift ______ the original value

Answer 21

doubles

Question 22

00010110 = 22 (Left Shift 1)

Answer 22

00101100 = 44

Question 23

One right shift _____ the original value

Answer 23

halves

Question 24

Complete the values:
B_______
D_______
H_______

Answer 24

Binary
Decimal
Hexidecimal

Question 25

Values of Denary (Base 10)

Answer 25

0-9

Question 26

Values of Hex (Base 16)

Answer 26

0-15

Question 27

Denary - Hex 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Answer 27

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

Question 28

Binary - Hex 00011010

Answer 28

1A

Question 29

Hex - Binary FF

Answer 29

255

Question 30

Denary - Hex 24

Answer 30

18

Question 31

Hex - Denary AB

Answer 31

171

Question 32

How to convert from Hex > Binary > Denary?

Answer 32

Take the first letter or number and put that in the Most Sig Nibble (Bit numbers 16, 32, 64, 128. A = 1010). Take the second letter or number and put that in the least significant nibble (Bit numbers 1, 2, 4, 8. B = 1011). Then put them together, AB = 10101011.

Question 33

ASCII means:

Answer 33

American Standard Code for Information Interchange

Question 34

ASCII has __ bits

Answer 34

7

Question 35

ASCII Extended has __ bits OR is 1 _____

Answer 35

8 bits 1 byte

Question 36

_______ replaced ASCII Extended

Answer 36

UNICODE

Question 37

Colour Depth of an image is how many ____ make up a pixel

Answer 37

bits

Question 38

Image size is calculated by _____ x _____ Use the equation above to work out: - width 17 - depth 14 - colour Depth 1

Answer 38

Width x Height 17x14 = 238pixels

Question 39

The impact of colour depth on file size:

Answer 39

The number of bits required for each pixel is known as the Colour Depth. The greater the Colour Depth & Resolution, the larger the file size is

Question 40

The impact of resolution on file size:

Answer 40

If the resolution is higher therefore the file size is bigger

Question 41

Metadata is:

Answer 41

all the information for the image (width/length/colour depth)

Question 42

Sound File Size

Answer 42

the total number of bits in a sound file. Number of Bits x Number of Bits Per Sample x Length of Sample in Seconds

Question 43

Bit depth

Answer 43

The number of bits stores per sample. the higher the bit depth, the greater the quality of sound and the larger the file size.

Question 44

Sample Rate

Answer 44

the number of samples stored per second. the higher the sample rate, the higher the quality of sound and the larger the file size.

Question 45

How is sound converted to a digital file?

Answer 45

An analogue-to-digital converter (ADC) converts the analogue signal from a microphone to a digital signal for the computer to process, recording can be affected by the low sample rate its taken at, as there isn't as much data points as if it were taken at higher one.