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EDEXCEL END OF TOPIC TEST REVISION

Total questions: 95

Worksheet time: 54mins

Name
Class
Date
1.

Why do we use hexadecimal numbers?

a)

shortcode for binary

b)

easier to read and write than binary

c)

less likely to make a mistake than binary

d)

fewer digits than binary

e)

smaller file sizes

2.

Convert denary 212 to an 8-bit binary number.

a)

11010100

b)

01001101

c)

10010110

d)

11011010

3.

"hello" is a...

a)

string

b)

integer

c)

real

d)

boolean

4.

5 is a...

a)

string

b)

integer

c)

real

d)

boolean

5.

5.0 is a...

a)

string

b)

integer

c)

real

d)

boolean

6.

TRUE is a...

a)

string

b)

integer

c)

real

d)

boolean

7.
Binary is:
a)
a system using the digits 0 and 1 to represent a letter, digit, or other character in a computer or other electronic device.
b)
the most common format for text files in computers and on the Internet
8.
Convert 128 to binary
a)
10000000
b)
01111110
c)
10000001
d)
11001100
9.
Convert 37 to binary
a)
00100101
b)
00100011
c)
00100111
d)
01000101
10.
Convert 00010001 to decimal
a)
17
b)
27
c)
37
d)
47
11.

Add the following binary numbers:

01

11

a)

101

b)

11

c)

111

d)

100

12.
Which of these is the correct sequence for the place values for binary numbers?
a)
1, 2, 4, 8, 16, 32, 64, 128
b)
1, 2, 4, 6, 8, 10, 12, 14, 16
c)
1, 2, 3, 4, 5, 6, 7, 8
d)
0, 1
13.
What are the only two numbers you can use in binary?
a)
0 and 1
b)
1 and 2
c)
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
d)
1, 2, 4, 8, 16
14.
What is the point of binary?
a)
It represents how computers interpret electrical signals
b)
Because we like to make you do extra maths ;-D
c)
For the lulz
d)
Because it describes star systems
15.
What is 1011 in denary?
a)
11
b)
14
c)
26
d)
1011
16.
Binary is:
a)
a system using the digits 0 and 1 to represent a letter, digit, or other character in a computer or other electronic device.
b)
the most common format for text files in computers and on the Internet
17.
Binary uses 1’s & 0’s to represent data
a)
True
b)
False
18.
What kind of data does a computer represent with binary?
a)
numbers
b)
letters
c)
pictures
d)
all of the above
19.

What kind of 'base' system is binary known as?

a)

Base 12

b)

Base 8

c)

Base 2

d)

Base 10

20.
Convert 11001100 to decimal
a)
224
b)
134
c)
104
d)
204
21.
Convert 11001100 to decimal
a)
224
b)
134
c)
104
d)
204
22.
Convert the hexadecimal number C9 to binary
a)
1100 1001
b)
1100 1000
c)
1100 1010
d)
1100 0101
23.
State the denary representation for the binary number 0011 1101
a)
60
b)
61
c)
62
d)
63
24.
What letters does hexadecimal use?
a)
A-F
b)
A-D
c)
P-W
d)
A-Z
25.
How many hexadecimal digits is equal to one nibble of binary?
a)
1
b)
2
c)
3
d)
4
26.
How many bits is a nibble made up of?
a)
1
b)
2
c)
3
d)
4
27.
What does 'A' equal in denary?
a)
8
b)
9
c)
10
d)
11
28.
What does 'F' equal in denary?
a)
14
b)
15
c)
16
d)
17
29.
What does 5F equal in denary?
a)
90
b)
95
c)
100
d)
105
30.
Convert 173 Decimal to Binary
a)
11000111
b)
11011101
c)
10101101
d)
01110011
31.
What number in hexadecimal comes after 7F?
a)
80
b)
8F
c)
7G
d)
8A
32.

11010111 in binary is...

a)

ODD

b)

EVEN

33.

10111110 in binary is...

a)

ODD

b)

EVEN

34.
Convert the Hex number 1F to binary.
a)
00111111
b)
00001111
c)
00010111
d)
00011111
35.
Convert the binary number 10101010 to Hex
a)
AA
b)
BB
c)
CC
d)
DD
36.
Convert the binary number 11101011 to Hex
a)
EA
b)
EB
c)
BA
d)
BC
37.
Write 45 as a binary number 
a)
00101111
b)
00011101
c)
00101011
d)
00101101
38.
Binary = 0100 1010 0011 1101
Hex = ?
a)
43AD
b)
4A3D
c)
D3A4
d)
3A4D
39.
Convert the Hex number B9 to binary.
a)
10111001
b)
10111000
c)
10111101
d)
10101001
40.

Why do we use hexadecimal numbers?

a)

shortcode for binary

b)

easier to read and write than binary

c)

less likely to make a mistake than binary

d)

fewer digits than binary

e)

smaller file sizes

41.

Select all the example of image metadata:

a)

bit depth

b)

size

c)

GPS location

d)

sample rate

e)

hexadecimal

42.

What is the problem with ASCII text encoding?

a)

It only supports 128 characters

b)

It only supports 256 characters

c)

There isn't support for other alphabets

d)

It isn't compatible with other character sets

43.

"hello" is a...

a)

string

b)

integer

c)

real

d)

boolean

44.

5 is a...

a)

string

b)

integer

c)

real

d)

boolean

45.

TRUE is a...

a)

string

b)

integer

c)

real

d)

boolean

46.

"8" is a...

a)

string

b)

integer

c)

real

d)

boolean

47.
Binary is:
a)
a system using the digits 0 and 1 to represent a letter, digit, or other character in a computer or other electronic device.
b)
the most common format for text files in computers and on the Internet
48.
ASCII is:
a)
a numerical system that has 2 rather than 10 as a base.
b)
the most common format for text files in computers and on the Internet
49.
ASCII was developed in what decade?
a)
1950s
b)
1960s
c)
1970s
d)
1940s
50.
ASCII is pronounced:
a)
Ask-ee
b)
A-skee
c)
A-skews-me
51.

ASCII is an encoding system for text. What does ASCII stand for?

a)

American Standard Code for Information Interchange

b)

All System Code In Internet

c)

American Simple Code for Interesting Information

d)

Alpha Super Code Input Information

52.

How many bits was used to encode the original ASCII character set?

a)

7

b)

8

c)

16

d)

4

53.

The Extended ASCII system uses 8 bits per character instead of 7 bits. How many different characters can be represented in 8 bits?

a)

1024

b)

8

c)

128

d)

256

54.

How many characters are currently represented (in 2017) by the Unicode system?

a)

21,977

b)

1,250,569

c)

75,004

d)

136,690

55.
Quality of an image depends on:
a)
Resolution
b)
Metadata
c)
Screen size
d)
Computer's speed
56.
The density of pixels in an image file is known as:
a)
Resolution
b)
Dimensions.
c)
Transparency.
d)
Compression.
57.
Resolution is measured in:
a)
Pixels per mm or per inch
b)
Print size.
c)
Milimeters.
d)
Bytes.
58.
Identify a true statement:
a)
Image files can be compressed by setting pixels with similar colour to the exactly same colour.
b)
Compressing files improves their quality.
c)
Resolution doesn't affect the printed size of an image.
d)
Black and white images have colour depth of two bits.
59.
Colour depth refers to:
a)
How many bits are used in a file to store colour information in every pixel
b)
Resolution divided by the number of colours in an image.
c)
Degree of file compression applied to an image file.
d)
Repeated resampling of an image.
60.
Most graphic formats create many colours from:
a)
Red, green, blue.
b)
Red, pink, yellow.
c)
Red, white, blue.
d)
Black, white, green.
61.
The smallest unit of data stored in an image file is called:
a)
Pixels
b)
Resolution
c)
Alpha
d)
Bitmap.
62.
Alpha-channel present in some images refers to:
a)
Transparency of pixels.
b)
Quality of a file.
c)
The order in which alternative pixels are loaded.
d)
Degree of file compression applied to an image file.
63.
A bitmap file is an example of raster graphics.
a)
True
b)
False
64.
A bitmap file contains virtually unlimited number of colours.
a)
False
b)
True
65.
Most graphic formats create many colours from:
a)
Red, green, blue.
b)
Red, pink, yellow.
c)
Red, white, blue.
d)
Black, white, green.
66.
The smallest unit of data stored in an image file is called:
a)
Pixels
b)
Resolution
c)
Alpha
d)
Bitmap.
67.
Digital sound always sounds better than analogue.
a)
False
b)
True
68.
The most common sampling rate for sound files is 16 bit.
a)
False
b)
True
69.
The most common sampling rate for sound files is 44.1 khz.
a)
True
b)
False
70.
A microphone converts the changes in air pressure into voltage changes which are then digitised.
a)
True
b)
False
71.
The following is true about sampling rates:
a)
They measure a number of snapshots of sound taken per second.
b)
They are not as important as bit rates.
c)
They are different for every song, depending on its loudness.
72.
Sampling rate for CDs is different from the one used by DVDs.
a)
True
b)
False
73.
DAC does this:
a)
Converts a binary stored version of a recording to voltage changes that speakers can reproduce.
b)
Takes voltage changes and digitises them for further processing and storage.
c)
Amplifies the sound and makes it digitally clean.
74.
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.
75.
Which of the following is not a usual way of reducing sound file size:
a)
Erasing metadata and keeping recordings short.
b)
Using lossy compression.
c)
Using lossless compression.
d)
Reducing sampling rate or bit rate.
76.
Lossy compression works by identifying sound frequencies that are not obvious and deleting them.
a)
True
b)
False
77.

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

78.

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

79.

What is sample rate measure in?

a)

Bits

b)

Hertz

c)

GB

d)

amps

80.

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

81.

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

82.
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.
83.

How many bits per pixel do you need to make 4 colours?

a)

colour depth of 1

b)

colour depth of 2

c)

colour depth of 3

d)

colour depth of 4

84.

On a sound graph you have two axis. Name them correctly

a)

X is the time (ms) and y is the amplitude (bit depth)

b)

X is the length (cm) and y is the amplitude (bit depth)

c)

X is the amplitude (bit depth) and y is the time (ms)

85.

On a sound graph you have two axis. Name them correctly

a)

X is the time (ms) and y is the amplitude (bit depth)

b)

X is the length (cm) and y is the amplitude (bit depth)

c)

X is the amplitude (bit depth) and y is the time (ms)

86.
Makes the file smaller by giving repeated patterns/colours a specific code
a)
Lossy Compression
b)
Lossless Compression
87.
A set of instructions for the computer to follow
a)
Algorithm
b)
Iteration
88.
Which of these is an advantage for Lossy compression?
a)
The file size becomes significantly (much) smaller
b)
The file size does not become much smaller than 50%
89.
Which of these is an advantage for Lossy compression?
a)
The file size becomes significantly (much) smaller
b)
The file size does not become much smaller than 50%
90.
What would you use compression for?
a)
Making an image file smaller
b)
Modifying an image 
91.

Which of the following would not be suitable for Lossy Compression?

a)

Images

b)

Sounds

c)

Videos

d)

Text

92.

Lossless compression permanently deletes the data

a)

True

b)

False

93.

Lossy compression would be suitable for text files

a)

True

b)

False

94.

There are _____ different types of compression

a)

2

b)

3

c)

4

95.

Compression looks for _______ data

a)

Unnecessary

b)

Repeated

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