WorksheetsUnit 1: Digital Information Review
Total questions: 25
Worksheet time: 50mins
Binary:
A set of rules governing the exchange or transmission of data between devices.
a simplified representation of something more complex. Abstractions allow you to hide details to help you manage complexity, focus on relevant concepts, and reason about problems at a higher level.
A way of representing information using only two options
having multiple backups to ensure reliability during cases of high usage or failure.
Bit
A set of rules governing the exchange or transmission of data between devices.
The number of bits that are conveyed or processed per unit of time. e.g. 8 bits/sec.
Time it takes for a bit to travel from its sender to its receiver.
A contraction of "Binary Digit"; the single unit of information in a computer, typically represented as a 0 or 1
Abstraction
American Standard Code for Information Interchange; the universally recognized raw text format that any computer can understand
A simplified representation of something more complex. Abstractions allow you to hide details to help you manage complexity, focus on relevant concepts, and reason about problems at a higher level.
A group of computers and servers that are connected to each other.
A type of computer that forwards data across a network
ASCII
Having multiple backups to ensure reliability during cases of high usage or failure
A group of computers and servers that are connected to each other.
American Standard Code for Information Interchange; the universally recognized raw text format that any computer can understand
A type of computer that forwards data across a network
Which of the following is a reason to use lossy compression?
You want the compressed file to be larger than the original.
You want the highest quality audio file possible, with no modifications.
You want the highest quality image file possible, with no modifications.
You want to save space and are not concerned if the file is the highest quality possible.
Innovation
A new or improved idea, device, product, etc, or the development thereof
A way of representing information using only two options
· A contraction of "Binary Digit"; the single unit of information in a computer, typically represented as a 0 or 1
Time it takes for a bit to travel from its sender to its receiver.
Which of the following is irreversible?
lossy compression
lossless compression
abstraction
RLI
How many bits are needed to represent 8 colors?
8 bits
24 bits
1 hex digit
3 bits
The color widget uses 3 bytes of metadata. The first two bytes indicate the width and height of the image. The next byte indicates the number of bits that will be used to represent color. How many bits is used to represent color given the metadata (in binary) 00001000 00001000 0001001
3 bits
6 bits
9 bits
12 bits
Consider the following three binary numbers:
01010
010000
1110
Which of the following lists the numbers in order from least to greatest?
010000
1110
01010
01010
1110
010000
01010
010000
1110
1110
01010
010000
the fundamental unit of a digital image, typically a tiny square or dot that contains a single point of color of a larger image
Image
Pixel
metadata
Pie Chart
A raw digital sound file samples a sound wave at some interval and measures the height of the wave at each point. Thus, raw sound is recorded as a list of numbers.
In very broad terms the MP3 audio compression algorithm identifies frequencies and volume levels - low and high - that are outside the range of human hearing and removes the data representing these frequencies from the original. This technique results in a smaller audio file that sounds exactly the same to the human ear.
This technique is an example of what type of compression?
Lossy compression
Lossless compression
Fast Fourier Transform compression
Tailored compression
Which of the following best describes how computing devices represent information?
A computer will either represent information as bits or bytes but not both
A computer represents data as a byte which is either a 0 or a 1
A computer represents data as bits which is either a 0 or a 1
A computer represents information as bits which contain 8 bytes.
When visiting a museum Sue takes a photo of a painting with a smartphone which stores the photo as an image file. Which of the following best describes the differences between the painting itself and the photo of the painting stored on the smartphone?
Both the painting and the photo are analog
Sampling can be used to determine whether the analog image is an accurate representation of the painting
The phone can represent the photo in either digital or analog formats depending on the sampling technique that is used
The photo is a digital representation of the analog painting
Your computer uses 4 bits to represent decimal numbers (0, 1, 2, 3 and so on) in binary. What is the SMALLEST number for which an overflow error occur?
14
15
16
17
Which of the following is true of how computers represent numbers?
With a fixed number of bits some numbers are too large to represent in a computer which will lead to overflow errors.
Using a fixed but large number of bits can eliminate the possibility of round off error when representing numbers in binary
Using a fixed but large number of bits, for example 128, eliminates the possibility of overflow errors.
With a large but fixed number of bits it is possible to eliminate either round-off errors or overflow errors, but not both.
Which of the following is true of lossy and lossless compression algorithms?
Lossy compression algorithms are used when perfect reconstruction of the original data is important.
Lossy compression algorithms are typically better than lossless compression algorithms at reducing the number of bits needed to represent a piece of data.
Lossless compression algorithms are only used to compress text data.
Lossless compression algorithms only allow for an approximate reconstruction of the original data.
Jorge is sending a large image file to a friend as part of a shared classroom project. Which of the following is most likely true if Jorge opts to compress the image before sending it?
The image can no longer be represented using bits.
The image will have been converted into an analog form.
The image will require more pixels to display it on the screen.
The image will require fewer bits in order to be represented.
Which of the following is true of intellectual property?
Information created on a computer is not owned by anyone since only analog information is protected under copyright law.
You do not need to cite work created by someone else if both the original work and your use of it are in digital form.
Creative Commons enables content creators to freely distribute their otherwise copyrighted work.
Creative Commons has severely hindered broad and open access to digital information
Lucy is completing a project as part of a science class using materials she found online. Which of the following is MOST LIKELY to lead to legal consequences?
Modifying a piece of open source software.
Using open access research for which she does not acquire a license.
Failing to publish her work under a Creative Commons license
Using images posted online by another student without permission or citation.
Ryan is designing an app that needs to quickly send low quality photos between users. Most smartphones take much higher quality photos than Ryan needs for his app. Which answer best describes the type of compression Ryan should choose and why?
Lossy compression since it typically results in smaller data sizes.
Lossless compression since it ensures perfect reconstruction of the photo.
Lossy compression since it ensures perfect reconstruction of the photo.
Lossless compression since it typically results in smaller data sizes.
Lisa takes a picture with her smartphone which she subsequently posts online. Allen finds the picture online and posts a copy of it on his website with an attached Creative Commons license. Which of the following best describes who owns the photo?
Allen owns the photo because only holders of a Creative Commons license can own works online.
Lisa owns the photo because she was the original creator and did not license the work.
Lisa owns the photo because it was granted a Creative Commons license by another person online.
Both own the photo because creating a copy makes it her intellectual property.
Convert the binary (base-2) number 0011 0001 to decimal (base-10).
32
64
49
121
Which of these binary (base-2) numbers is the smallest?
1000 0001
1100 0001
0110 0110
0001 1111
How many numbers can be represented with an 8-bit binary system?
255
256
128
127
