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WorksheetsComputer Science Principles Unit 1 Review
Total questions: 17
Worksheet time: 1hrs 25mins
What's the relationship between a byte and a bit?
8 bytes in a bit
4 bits in a byte
10 bytes is a bit
8 bits in a byte
Computers store information in bits, or binary digits. Which of the following could be represented in bits?
Numbers
Text
Images
Sounds
All of the above
Creating simplified representations of something more complex is called:
Obstruction
Abstraction
Substitution
Flippy-Do
What is 1001 in decimal form?
9
10
12
13
What is 15 in binary?
1100
1101
1110
1111
How many bits do you need to make 21 in binary?
3
4
5
6
Which is true about 3 bits?
The highest number you can reach is 8, giving you 9 numbers (0-8)
The highest number you can reach is 7, giving you 8 numbers (0-7)
The highest number you can reach is 8, giving you 8 numbers (0-7)
The highest number you can reach is 7, giving you 7 numbers (0-7)
Which is true about analog vs digital?
Analog is data with values that change continuously, or smoothly, over time while digital is has a finite set of possible values
Analog has a finite set of possible data values while digital has data values that change continuously, or smoothly, over time
Which of the following is true about creating a digital image? Select all that apply.
The more sampling you do, the closer the image will look to the analog version
The less sampling you do, the closer the image will look to the analog version
The more pixels you have, the smaller the file size of the image
The more pixels you have, the larger the file size of the image
Compression is a process used to reduce the number of bits necessary to represent something.
True
False
What is the difference between lossy and lossless compression? Select all that apply.
With lossless compression, you can reverse the process and recreate the original exactly
With lossy compression, no information is lost
With lossless compression, the size of the file sent is NOT going to be smaller than the original
Lossy compression is ok if you are just trying to send a quick silly picture to someone but if specific details were important, you should use lossless compression
Lossless compression would send a higher quality image than one sent with lossy compression
What is true about copyright laws?
If you use someone's stuff and don't cite it, you are violating copyright laws
If someone has a Creative Commons license, then you are able to use their stuff freely (as long as it follows what is written in the license)
Open source means you are free to use it without worrying about copyright laws
All of the above
The single unit of information in a computer, typically represented as a 0 or 1.
Bit
Binary
Storage
Protocol
Error from attempting to represent a number that is too large.
Round-off Error
Data Compression
Open Source
Overflow Error
Error from attempting to represent a number that is too precise. The value is rounded.
Bit
Lossy Compression
Sampling
Round-off Error
In an ASCII file, each alphabetic, numeric, or special character is represented with an 8-bit binary number (a string of eight 0s or 1s).
True
False
How many more numbers can be represented with 5 bits as opposed to 4?
2 times as many
4 times as many
5 times as many
10 times as many
