Computer Science

Which of the following is true of how computers represent numbers?

• 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.

• With a large but fixed number of bits it is possible to eliminate either round-off errors or overflow errors, but not both.

• With a fixed number of bits some numbers are too large to represent in a computer which will lead to overflow errors.

Which of the following is NOT true of how computers represent complex information?

• Computing devices use patterns of bits to represent complex information

• Common abstractions that are represented by computing devices include numbers, characters, and color.

• Abstraction helps represent complex information by surfacing complexity that might otherwise be hidden

• Depending on context the same sequence of bits may represent different types of information

Tags

NGSS.MS-PS4-3

Depending on context the same sequence of bits may represent different types of information

• 10100

• 10010

• 00101

• 11000

Tags

NGSS.MS-PS4-3

How many total numbers can be represented with an 8-bit binary (base-2) system?

• 127

• 128

• 255

• 256

Arman takes a picture with his smartphone which he subsequently posts online. Beatrice finds the picture online and posts a copy of it on her website with an attached Creative Commons license. Which of the following best describes who owns the photo?

• Arman owns the photo because he was the original creator and did not license the work.

• Arman owns the photo because it was granted a Creative Commons license by another person online.

• Beatrice owns the photo because only holders of a Creative Commons license can own works online.

• Both own the photo because creating a copy makes it her intellectual property.

Which of the following is true of intellectual property?

• Creative Commons has severely hindered broad and open access to digital information

• Creative Commons enables content creators to freely distribute their otherwise copyrighted work

• 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.

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?

• Lossless compression since it typically results in smaller data sizes.

• Lossless compression since it ensures perfect reconstruction of the photo.

• Lossy compression since it typically results in smaller data sizes.

• Lossy compression since it ensures perfect reconstruction of the photo.

Which of the following best describes how computing devices represent information?

• A computer represents information as bits which contain 8 bytes.

• A computer represents data as bits which is either a 0 or a 1

• A computer represents data as a byte which is either a 0 or a 1

• A computer will either represent information as bits or bytes but not both

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?

• 17

• 16

• 15

• 14

Convert the binary (base-2) number 1001 to decimal (base-10).

• 17

• 16

• 10

• 9