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WJEC 1.4 Organisation of Data

Total questions: 70

Worksheet time: 49mins

Name
Class
Date
1.

A higher sampling rate means...

a)

A higher quality sound file

b)

A larger sound file

c)

A lower quality sound file

d)

A smaller sound file

2.

A higher sampling resolution means...

a)

A higher quality sound file

b)

A larger sound file

c)

A lower quality sound file

d)

A smaller sound file

3.

How much space in kb will be required to store an 5 second long clip of music with a sample rate of 44.1hz and a sample resolution of 16?

a)

441kb

b)

882kb

c)

220kb

d)

350kb

4.

What is sample resolution?

a)

The number of bits used to store each sample

b)

The number of times a wave is sampled

c)

How loud a sound is

d)

How quiet a sound is

5.

What is the sample rate?

a)

The number of times a sound wave is sampled per second

b)

The number of bits used to store each sample

c)

How loud a sound is

d)

The size of the sound wave

6.

What is sample rate measure in?

a)

Bits

b)

Hertz

c)

GB

d)

amps

7.

What is used to convert a sound wave in to a digital format?

a)

A sound wave converter

b)

A router

c)

An amplitude to digital converter

d)

Analogue to digital converter

8.

What is the formula for finding a sound files size?

a)

size = rate * resolution * seconds

b)

size = rate * resolution * minutes

c)

size = amplitude * bits * seconds

d)

size = sample * frequency * bits

9.

What is amplitude?

a)

Number of samples taken

b)

The number of bits per sample

c)

The height of the sound wave

d)

The pitch

10.
What is Pitch?
a)
How loud or soft a sound is
b)
muscle that holds vocal cords
c)
movement back and forth
d)
how high or low a sound is
11.
The most common sampling rate for sound files is 44.1 khz.
a)
True
b)
False
12.
Identify a false statement:
a)
Higher bit rates usually improve the sound quality and result in smaller file size.
b)
Higher bit rates usually improve the sound quality but result in larger file size.
c)
To record a sound into binary format, ADC will be applied rather than DAC.
13.
How is sound caused?
a)
By playing it through a hi-fi with speakers
b)
Vibrations travelling through air, water or metal.
14.
What is the difference between analogue and digital data?
a)
Analogue is continuous data, whereas digital signals have two values, 0 and 1.
b)
Analogue has two values 0 and 1, whereas digital is continuous data.
15.

The sound engineer is using a sampling rate of 2000 Hz and a sample resolution of 4 bits. What is the minimum file size of a 10 second recording? Your answer should be given in bits.

a)

80,000

b)

10,000

c)

8

d)

800

16.

The sound engineer is using a sampling rate of 1500 Hz and a sample resolution of 4 bits. What is the minimum file size of a 5 second recording? Your answer should be given in bits.

a)

24,000

b)

30,000

c)

375

d)

3

17.
Computers can only process information using 0s and 1s
a)
TRUE
b)
FALSE
18.
Computers can only process information using 0s and 1s
a)
TRUE
b)
FALSE
19.
What is the name of the Base 10 number system?
a)
Binary
b)
Denary
c)
Hexadecimal
20.
Binary is base
a)
16
b)
10
c)
2
d)
32
21.

A bit is

a)

a numerical label assigned to each device.

b)

the smallest unit of data in a computer.

c)

a keyboarding term for typing.

d)

just a lil bit.

22.

How many bits in a nibble?

a)

2

b)

4

c)

8

d)

1

23.

How many bits are there in a byte?

a)

8

b)

10

c)

2

d)

9

24.

How many nibbles are there in a byte?

a)

1

b)

2

c)

4

d)

8

25.

11010111 in binary is...

a)

ODD

b)

EVEN

26.

10111110 in binary is...

a)

ODD

b)

EVEN

27.

How can you tell if a binary sequence (01110010) is even?

a)

You add all the 1s up and if it's even then the binary sequence is even

b)

If there is a 0 on the end then it's an even number

c)

If there is a 1 on the end then it's an odd number

d)

You cannot

28.

How can you tell if a binary sequence (01110011) is even?

a)

You add all the 1s up and if it's oddthen the binary sequence is odd

b)

If there is a 0 on the end then it's an even number

c)

If there is a 1 on the end then it's an odd number

d)

You cannot

29.
Convert 10112 in to Denary (Base 10).
a)
10
b)
11
c)
9
d)
8
30.
The biggest number you can make with 4 binary digits is _____
a)
15
b)
14
c)
13
d)
16
31.
State the binary representation for the denary number 17
a)
0001 0001
b)
1000 1000
c)
0010 0001
d)
0001 0010
32.
How many bits do I need to be able to store the numbers from 0-255 (256 numbers)?
a)
6
b)
7
c)
8
d)
9
33.
State the denary representation for the binary number 0011 1101
a)
60
b)
61
c)
62
d)
63
34.
Convert denary 160 to binary.
a)
10100000
b)
11110110
c)
11101010
d)
00000100
35.
Add binary numbers shown?
a)
01111011
b)
01101111
c)
01111101
d)
01101101
36.
Add binary numbers shown?
a)
10010000
b)
10001000
c)
10000100
d)
10100000
37.
Add binary numbers shown?
a)
01011010
b)
10011010
c)
10010101
d)
10100010
38.
Add binary numbers shown?
a)
10100100
b)
10010100
c)
11000100
d)
01011110
39.
What is this an example of?
a)
Overflow error
b)
8 bit binary addition
40.
In a logical _____ shift we multiply by 2 for each shift place.
a)
Left
b)
Right
c)
Right and Left
41.
In a logical _____ shift we divide by 2 for each shift place.
a)
Left
b)
Right
c)
Right and Left
42.
Shift 01101000 to 3 places to the right
a)
00110100
b)
00001101
c)
00011010
43.
ASCII stands for... 
a)
American Standard Code for Information Interchange
b)
American Scientific Code for Information Interchanging
c)
Absolute Standard Codes for Instruction Interchange
44.
How many bits are used in (standard) ASCII?
a)
16
b)
1
c)
7
d)
8
45.
The (standard) ASCII code is capable of representing many non-European languages.
a)
True
b)
False
46.
Upper and lower case letters have a different ASCII code.
a)
True
b)
False
47.
How is ASCII used to represent text in a computer system?
a)
ASCII is stored on the hard drive for long-term storage.
b)
Each character is given a numeric code (symbols, letters).  This is stored in binary.  Some codes are reserved for control characters
48.
Why was Unicode developed in 1991?
a)
To improve the character sets on computers
b)
Needed so we could display non-printing characters
c)
There was a need for a universal standard and more characters to cover all languages on earth.
d)
To replace early character sets used on teletype and teleprinting machines
49.
If ASCII "a" is 97 in denary  What is "b"?
a)
95
b)
96
c)
98
d)
99
50.
Bitmap graphics are also known as...
a)
Raster Graphics
b)
Vector Graphics
c)
Scalable Graphics  
d)
SVG Graphics
51.
A bitmap image is made up of many coloured dots called...
a)
Pixels
b)
Vectors
c)
RGBs
d)
GIFs
52.
Every pixel in a bitmap image is assigned a...
a)
RGB Value
b)
Vector Value
c)
Resolution Value
d)
PNG Value
53.
Resolution is...
a)
The number of pixels in an image.
b)
The size of an image.
c)
The scalability of an image.  
d)
The shape of an image.
54.
Vector graphics are more suitable than bitmaps for logos because...
a)
They are scalable.
b)
They are smaller.
c)
They contain more colours.
d)
They are made of pixels.
55.
A vector graphic is made of lines and shapes which are based on...
a)
Mathematical Equations
b)
Pixels
c)
RGB Values
d)
Hexadecimal Codes
56.
The size of a vector graphic file is usually larger than the size of a bitmap graphic file.
a)
True
b)
False
57.

A vector image is...

a)

mathematical functions which draw an image

b)

able to change size smoothly without blurring

c)

pixels on a grid which make an image

d)

unable to change size without blurring

58.

A bitmap image is...

a)

mathematical functions which draw an image

b)

able to change size smoothly without blurring

c)

pixels on a grid which make an image

d)

unable to change size without blurring

59.

A bit depth of 8 means...

a)

There will be 2 different colours possible

b)

Each pixel will require 1 bit to store

c)

Each pixel will require 1 byte to store

d)

There will be 256 colours possible

60.

A bit depth of 1 means...

a)

There will be 2 different colours possible

b)

Each pixel will require 1 bit to store

c)

Each pixel will require 1 byte to store

d)

There will be 256 colours possible

61.

To have 128 different colours possible in one image, the bit depth needs to be...

a)

1

b)

7

c)

5

d)

3

62.

Select all the example of image metadata:

a)

bit depth

b)

size

c)

GPS location

d)

sample rate

e)

hexadecimal

63.
Why is it easier to use hexadecimal compared with binary ?
a)
Easier to remember 1 hex digit compared with 4 binary digits
b)
Easier to read - letters compared with numbers
c)
Saves memory - only 1 character compared with 4
d)
Easier to remember
64.
What is the base of hexadecimal?
a)
2
b)
10
c)
16
d)
32
65.

One hex character is...

a)

1 nibble

b)

1 byte

c)

4 bits

d)

1 chomp

66.
Convert the hexadecimal number C9 to binary
a)
1100 1001
b)
1100 1000
c)
1100 1010
d)
1100 0101
67.
Convert the binary number 10101010 to Hex
a)
AA
b)
BB
c)
CC
d)
DD
68.

10000011 in Hexadecimal

a)

83

b)

F9

c)

D7

d)

EA

69.

Where is hexadecimal used on the internet?

a)

To represent colours (RGB values)

b)

It's written into every website to display text

c)

Videos are stored in hex

d)

On BBC Bitesize and that's the only place you'll ever find it

70.

Where is hexadecimal used inside a computer?

a)

For the locations of memory

b)

For interfacing between a printer and Microsoft Word

c)

It is never, only humans use it

d)

Sound plays quicker in hex, so we store it in hex

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