Code.org Q3 Review and Pop Quiz

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 bits which is either a 0 or a 1

Answer explanation

The definition of a bit: a contraction of "Binary Digit"; the single unit of information in a computer, typically represented as a 0 or 1.

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

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

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

Answer explanation

Abstraction helps by hiding complexity rather than surfacing it. For example, you don't have to know all the details about how a car works in order to operate it.

When visiting a museum Louis 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

• 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

Answer explanation

A painting is an analog because it's something with continuous representation. A digital photo changes discreetly at every pixel using a finite set of colors.

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 will require fewer bits to be represented

• The image will be converted

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 for

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

Answer explanation

Creative Commons works within copyright law. It allows creators to grant permission to everyone in the world to use their work in certain ways.

Which of the following Internet protocols is used to request and send pages and files on the World Wide Web?​ (a)  

• HTTP
• Internet Protocol (IP)
• C. User Datagram Protocol (UDP)
• Transmission Control Protocol (TCP)
• User Datagram Protocol (UDP)

An Internet Service Provider (ISP) is a company that builds the routers and wired connections that allow individuals to access the Internet.   An ISP is considering adding additional redundant connections to its network. Which of the following best describes why the company would choose to do so?

• It costs less to design a network that is redundant

• The protocols of the Internet only work on networks that are redundant

• Redundant networks are more reliable

Answer explanation

When a network contains redundant connections, the network can continue to function in the event of slow downs or disconnections in specific parts of the network.

Which of the following situations is most likely to cause issues arising from the digital divide?​ ​ (a)  

• A smartphone attempts to communicate over the Inte
• A state makes voter registration forms available
• Packets sent from one router to another

Answer explanation

Since access to computing devices and the Internet differs across socioeconomic, geographic, and demographic characteristics, this policy would provide differing levels of access to voter registration across those same characteristics.

Which of the following is MOST likely to be an outcome of the digital divide?​ ​ (a)  

• People from some racial or ethnic groups have uneq
• C. People will have equal access and influence
• Certain companies will be unable to certify
• People will have equal access and influence

Which of the following best describes the purpose of a design specification?

• Tracking errors that arise through user testing

• Documenting comments that will need to be added to a program

• Describing the requirements for how a program will work or users will interact with it