Comp Sci Unit 2 #3

Which of the following best describes a direct benefit in using redundant routing on the Internet?

• 
  Redundancy enables messages to be transmitted with as few packets as possible.

• Redundancy enables network devices to communicate with as few network connections as possible.

• Redundancy often allows messages to be sent on the network even if some network devices or connections have failed.

• Redundancy prevents network communications from being intercepted by unauthorized individuals.

Which of the following school policies is most likely to have a positive impact on the digital divide?

• A school allows students to bring a graphing calculator from home to complete in-class mathematics assignments.

• A school allows students to bring a tablet computer to class every day to participate in graded quizzes.

• A school provides a laptop or tablet computer to all students enrolled at the school.

• A school recommends that all students purchase a computer with as much processing speed as possible so that projects run faster.

Which of the following actions are generally helpful in program development?

1. 1. Consulting potential users of the program to identify their concerns

2. 2. Writing and testing small code segments before adding them to the program

3. 3. Collaborating with other individuals when developing a large program

• 
  I and II only

• 
  I and III only

• II and III only

• I, II, and III

The player controls in a particular video game are represented by numbers. The controls and their corresponding binary values are shown in the following table.

The numeric values for the controls can also be represented in decimal (base 10).

What control is represented by the decimal value 15 ?

• ←

• ↑

• →

• ↓

The author of an e-book publishes the e-book using a no-rights-reserved Creative Commons license. Which of the following best explains the consequences of publishing the book with this type of license?

• The contents of the e-book will be encrypted and can only be decrypted by authorized individuals.

• Individuals can freely distribute or use the contents of the e-book without needing to obtain additional permissions from the author.

• Individuals will be legally prevented from sharing the e-book on a peer-to-peer network.

• Individuals will be legally prevented from using excerpts from the e-book in another published work.

A student is creating an application that allows customers to order food for delivery from a local restaurant. Which of the following is LEAST likely to be an input provided by a customer using the application?

• The address where the order should be delivered

• The cost of a food item currently available for order

• The credit card or payment information for the purchaser

• The name of a food item to be included in the delivery

Which of the following is NOT a benefit of collaborating to develop a computing innovation?

• Collaboration can decrease the size and complexity of tasks required of individual team members.

• Collaboration can make it easier to find and correct errors during the development process.

• Collaboration eliminates the need to resolve differences of opinion.

• Collaboration facilitates multiple perspectives in developing ideas.

Which of the following best explains how data is transmitted on the Internet?

• Data is broken into packets, which are all sent to the recipient in a specified order along the same path.

• Data is broken into packets, which can be sent along different paths.

• All data is transmitted in a single packet through a direct connection between the sender and the recipient.

• Multiple data files are bundled together in a packet and transmitted together.

A programmer is developing software for a social media platform. The programmer is planning to use compression when users send attachments to other users. Which of the following is a true statement about the use of compression?

• Lossless compression of video files will generally save more space than lossy compression of video files.

• Lossless compression of an image file will generally result in a file that is equal in size to the original file.

• 
  Lossy compression of an image file generally provides a greater reduction in transmission time than lossless compression does.

• Sound clips compressed with lossy compression for storage on the platform can be restored to their original quality when they are played.

A video-streaming Web site keeps count of the number of times each video has been played since it was first added to the site. The count is updated each time a video is played and is displayed next to each video to show its popularity.

At one time, the count for the most popular video was about two million. Sometime later, the same video displayed a seven-digit negative number as its count, while the counts for the other videos displayed correctly. Which of the following is the most likely explanation for the error?

• The count for the video became larger than the maximum value allowed by the data type used to store the count.

• The mathematical operations used to calculate the count caused a rounding error to occur.

• The software used to update the count failed when too many videos were played simultaneously by too many users.

• The software used to update the count contained a sampling error when using digital data to approximate the analog count.