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WorksheetsGCSE J277 - Representing Images, Sounds and Character Sets Quiz
Total questions: 80
Worksheet time: 27mins
Name
Class
Date
1.
With a 1 bit colour depth image, how many bits are needed to represent each pixel?
a)
1
b)
2
c)
3
d)
4
2.
How many different colours can be represented in a 1 bit colour depth image?
a)
1
b)
2
c)
3
d)
4
3.
With a 2 bit colour depth image, how many bits are needed to represent each pixel?
a)
1
b)
2
c)
3
d)
4
4.
How many different colours can be represented in a 2 bit colour depth image?
a)
1
b)
2
c)
3
d)
4
5.
With a 3 bit colour depth image, how many bits are needed to represent each pixel?
a)
1
b)
2
c)
3
d)
4
6.
How many different colours can be represented in a 3 bit colour depth image?
a)
6
b)
7
c)
8
d)
9
7.
With a 4 bit colour depth image, how many bits are needed to represent each pixel?
a)
1
b)
2
c)
3
d)
4
8.
How many different colours can be reperesneted in a 4 bit colour depth image?
a)
8
b)
16
c)
32
d)
64
9.
What is resolution?
a)
The number of colours that can be represented in an image
b)
The number of years an image has existed
c)
The concentration of pixels within the image
d)
The name of exactly 100 pixels
10.
What is colour depth?
a)
The number of colours that can be represented in an image
b)
How deep you can go with certain greys and blues
c)
A high concentration of pixels
d)
How many deep colours you can show
11.
Increasing colour depth
a)
Compresses the file
b)
Deepends the colours
c)
Makes the file size bigger
d)
Makes the file size smaller
12.
Decreasing colour depth
a)
Compresses the file
b)
Deepends the colours
c)
Makes the file size bigger
d)
Makes the file size smaller
13.
How many pixels would a 20x20 image have?
a)
100
b)
200
c)
400
d)
800
14.
A 20x20 image has 400 pixels, if it has 8 bit colour depth, how many bits will be required
a)
256
b)
3000
c)
3200
d)
4000
15.
The overall detail of an image, this is affected by the colour depth and resolution
a)
Image Size
b)
Resolution
c)
Image Quality
d)
Colour Depth
16.
A set of data that describes and gives information about other data
a)
Datadata
b)
Datameta
c)
Data
d)
Metadata
17.
Smallest unit of a digital image
a)
Pixle
b)
Pixel
c)
Pixal
d)
Pixol
18.
Increasing colour depth
a)
Compresses the file
b)
Deepends the colours
c)
Improves picture quality
d)
Reduces picture quality
19.
Decreasing colour depth
a)
Compresses the file
b)
Deepends the colours
c)
Improves picture quality
d)
Reduces picture quality
20.
2⁴
a)
4
b)
8
c)
16
d)
32
21.
What is analogue sound?
a)
Recording sound as 1s and 0s
b)
Recording audio in a format of continuous waves
22.
What does digital sound mean?
a)
Soundwaves
b)
Sound represented as binary values
c)
Sound represented as denary values
d)
Sound that humans emit
23.
What does sampling rate mean?
a)
The number of times a digital signal is sampled per second
b)
The number of times sound is sampled per second
c)
The number of times analogue sound is sampled per second
d)
The unit of frequency for digital sound
24.
What is the unit of frequency used in sound files?
a)
Bits
b)
Hertz
c)
Hz
d)
Binary
25.
How is bit rate calculated?
a)
Bit Depth * Sample Rate
b)
Bit Depth / Sample Rate
c)
Bit Depth * Sample Rate * Channels
d)
Bit Depth * Sample Rate / Channels
26.
MP3_1 has a sample rate of 50Hz, MP3_2 has a sample rate of 20Hz. Which is the higher quality?
a)
MP3_1
b)
MP3_2
27.
MP3_1 has a sample rate of 50Hz, MP3_2 has a sample rate of 20Hz. Which is the larger file size
a)
MP3_1
b)
MP3_2
28.
State a device that is used to capture an analogue sound signal
a)
DVD
b)
Keyboard
c)
Webcam
d)
Microphone
29.
The number of samples taken per second
a)
Sample Rate
b)
Sample Duration
c)
Bit Depth
d)
Playback Quality
30.
This is effected by the sample rate and the bit-depth
a)
Sample Rate
b)
Sample Duration
c)
Bit Depth
d)
Playback Quality
31.
The number of bits available for each sample
a)
Sample Rate
b)
Sample Duration
c)
Bit Depth
d)
Playback Quality
32.
How many seconds of audio the sound file contains
a)
Sample Rate
b)
Sample Duration
c)
Bit Depth
d)
Playback Quality
33.
2⁴
a)
1
b)
8
c)
16
d)
256
34.
2⁸
a)
1
b)
8
c)
16
d)
256
35.
Waves are continous
a)
Analogue
b)
Digital
36.
Waves are discrete
a)
Analogue
b)
Digital
37.
What form must sound data be in for a computer to be able to process it?
a)
Binary
b)
Denary
c)
Hexadecimal
d)
Binary or Denary or Hexadecimal
38.
If you increase the sample rate of the sound what is the impact?
a)
The file size increases and the quality also increases
b)
The file size decreases and the quality increases
c)
The file size increases but the quality decreases
d)
The file size decreases and the quality also decreases
39.
If you decrease the bit rate of the sound what is the impact?
a)
The file size increases and the quality also increases
b)
The file size decreases and the quality increases
c)
The file size increases but the quality decreases
d)
The file size decreases and the quality also decreases
40.
Why is it not a good idea to have the highest bit rate and sample rate if you are streaming on the internet?
a)
You won't notice the difference
b)
You might end up buffering as the file size is so large
c)
It will make the sound too loud
d)
Sound be fine
41.
What does ASCII stand for?
a)
Asian Standard Code for Information Interchange
b)
American Standard Character for Information Interchange
c)
American Standard Code for Information Interchange
d)
Unicode
42.
How many bytes are there in one extended ASCII Character?
a)
1
b)
2
c)
4
d)
8
43.
How many characters can the standard ASCII table hold?
a)
128
b)
256
c)
127
d)
255
44.
How many characters can the extended ASCII table hold?
a)
128
b)
256
c)
127
d)
255
45.
What langauge does American Standard Character for Information Interchange translate to?
a)
America
b)
English
c)
Chinese
d)
Japanese
46.
How many bits does a UNICODE character use?
a)
1
b)
8
c)
16
d)
32
47.
Why was UNICODE created?
a)
ASCII became redundant
b)
ASCII couldn't hold enough characters
48.
(Roughly) How many characters can UNICODE potentially hold?
a)
Limitless
b)
4 Million
c)
4 Billion
d)
4 Trillion
49.
A character set is
a)
The language which is used in a computer system
b)
Fonts install on the computer
c)
All possible characters that can be represented
d)
Fonts used on other computers
50.
How many bits are used in standard ASCII?
a)
1
b)
7
c)
8
d)
16
51.
How many bits are used in extended ASCII?
a)
1
b)
7
c)
8
d)
16
52.
Upper and lowercase letters have different ASCII codes
a)
True
b)
False
53.
The word "Hello" is made up of 5 characters. How many bits is this
a)
40
b)
48
c)
60
d)
80
54.
ASCII code is represented using 16 bits
a)
True
b)
False
55.
Standard ASCII is capable of representing non-european languages
a)
True
b)
False
56.
ASCII can represent more characters than Unicode
a)
True
b)
False
57.
Choose the best description about a character set
a)
Only binary characters in character sets are stored in binary
b)
Some characters in character sets are stored in binary
c)
All characters in character sets are stored in binary
d)
All characters in character sets are stored in hexadecimal
58.
Character have unique _____ ______ for characters, symbols and numbers
a)
Binary Numbers
b)
Denary Numbers
c)
Hexadecimal Values
d)
Letters
59.
How do computers represent characters?
a)
Using Binary
b)
Using Denary
c)
Using Hexadecimal
d)
Using Letters
60.
UNICODE can represent more characters than binary
a)
TRUE
b)
FALSE
61.
Which compression technique will allow faster file transfers?
a)
Lossy
b)
Lossless
62.
Which compression technique permanently removes data
a)
Lossy
b)
Lossless
63.
Which compression technique reduces the file size by storing repeating details together?
a)
Lossy
b)
Lossless
64.
Which compression technique removes data from the file to make it smaller?
a)
Lossy
b)
Lossless
65.
The more the file is compressed, the lower the quality it will be
a)
Lossy
b)
Lossless
66.
Used for text files or files with lots of data repetition
a)
Lossy
b)
Lossless
67.
The compressed file can be returned to the original
a)
Lossy
b)
Lossless
68.
The compressed file cannot be returned to the original
a)
Lossy
b)
Lossless
69.
The compressed file can be returned to the original
a)
Lossy
b)
Lossless
70.
Generally used for images and sound files
a)
Lossy
b)
Lossless
71.
I have a lot of files to store, which compression technique is best to use?
a)
Lossy
b)
Lossless
72.
I want to compress and send a friend a program file, which technique is best to use?
a)
Lossy
b)
Lossless
73.
Images on websites which have been run through lossy compresion will load quicker
a)
True
b)
False
74.
Compression in general makes it ______ to send, upload and stream data
a)
Quicker
b)
Slower
75.
Lossy compression looks for ______ data
a)
Unnecessary
b)
Repeated
76.
Lossless compression is best used on
a)
Word Documents and Programs
b)
Images and Sound Files
77.
Lossy compression is best used on
a)
Word Documents and Programs
b)
Images and Sound Files
78.
This compression technique does not compromise the data's quality
a)
Lossy
b)
Lossless
79.
This compression technique does not reduce the size of data as much
a)
Lossy
b)
Lossless
80.
Requires processing power to uncompress the image
a)
Lossy
b)
Lossless
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