WorksheetsData Representation: Quiz 1
Total questions: 27
Worksheet time: 57mins
What is a bit?
a basic computing element that is either 0 or 1
a tiny piece
a binary number
a pixel
Which of these is the number system based on the number 16?
Decimal
Binary
Denary
Hexadecimal
Which of these are not typically represented in hexadecimal?
MAC address
Colour codes
IPv4 address
Error codes
Convert 89 from denary to binary. Write your answer as an 8-bit number.
(a)
Convert 103 from denary to hexadecimal.
(a)
Convert 11010111 from binary to hexadecimal.
(a)
Convert E9 from hexadecimal to denary.
(a)
What is an overflow error?
When bits are shifted left or right
When the result of a calculation is too large to fit in a binary register
Converting a negative denary number to binary
The result of flipping bits in a binary number
Express -78 as a binary number in 8-bit two's complement form.
(a)
Express 53 as a binary number in 8-bit two's complement form.
(a)
What is the result of adding the following binary numbers together?
01111011
10100101
Express your answer as an 8-bit number.
(a)
What can you say about the result of the previous question?
(a)
Which of these is a character set of standard characters on a keyboard (including control codes)?
Unicode
HTML
ASCII
MAC address
Given that the ASCII code for the character 'K' is 75,
what is the ASCII code for the character 'N'?
Express your answer as an 8-bit binary number.
(Write this down, you will need it later.)
(a)
Using your result from the previous question,
what is the denary ASCII code for 'n'?
78
110
122
107
What is sampling resolution?
the maximum rate of transfer of data across a network
the number of sound samples taken per second in digital sound
the number of pixels in the X–Y direction of an image
the number of bits used to represent sound amplitude in digital sound
What is colour depth?
the number of bits used to represent the colours of a pixel
the smallest element used to make up an image on a display
an image made up of pixels
the number of bits used to represent the smallest unit in a sound file
What is compression?
deleting unnecessary sounds from a file
reducing file size by removing redundant pieces of data
run length encoding
shrinking an image
A 1080p image (1920 x 1080 pixels) has a colour depth of 16.
How many of these images can fit on a 2GiB pen drive?
(a)
A song is recorded to digital at 60Hz with a bit depth of 12.
The audio is recorded in stereo, and the song is 2 minutes long.
What is the file size of the song?
Express your answer in KiB.
(a)
What is a characteristic of lossless compression?
Quality is sacrificed
The original file can be reconstructed
Compressed files are considerably smaller
Data is eliminated
Name one example of lossy compression
(a)
Name one example of lossless compression.
(a)
The 6x6 pixel image shown is represented in colour, and is compressed by RLE.
What is its RLE code?
(Write this down, you'll need it later.)
Blue is 0 0 255
Red is 255 0 0
(a)
Given that each pixel is represented by 3 bytes, what is its uncompressed file size? Include units.
(Write this down, you'll need it later.)
(a)
What is the compressed file size of the image? Include units.
(Write this down, you'll need it later.)
(a)
What is the percentage reduction in file size of the image?
Express in 3 significant figures.
(a)
