review for test.
An online store uses 6-bit binary sequences to identify each unique item for sale. The store plans to increase the number of items it sells and is considering using 7-bit binary sequences. Which of the following best describes the result of using 7-bit sequences instead of 6-bit sequences?
2 times as many items can be uniquely identified.
Which of the following has the greatest potential for compromising a user's personal privacy?
A group of cookies stored by the user's Web browser
An algorithm will be used to identify the maximum value in a list of one or more integers. Consider the two versions of the algorithm below. Algorithm I : Set the value of a variable max to − 1. Iterate through the list of integer values. If a data value is greater than the value of the variable max, set max to the data value. Algorithm II : Set the value of a variable max to the first data value. Iterate through the remaining values in the list of integers. If a data value is greater than the value of the variable max, set max to the data value. Which of the following statements best describes the behavior of the two algorithms?
Algorithm II always works correctly, but Algorithm I only works correctly when the maximum value is greater than or equal to − 1.
A computer program uses 3 bits to represent integers. When the program adds the decimal (base 10) numbers 5 and 3, the result is 0. Which of the following is the best explanation for the result?
An overflow error occurred.
Digital images are often represented by the red, green, and blue values (an RGB triplet) of each individual pixel in the image. A photographer is manipulating a digital image and overwriting the original image. Which of the following describes a lossless transformation of the digital image?
Creating the negative of an image by creating a new RGB triplet for each pixel in which each value is calculated by subtracting the original value from 255. The negative of an image is reversed from the original;light areas appear dark, and colors are reversed.
A programmer is deciding between using a linear or binary search to find a target value in a sorted list. Which of the following is true?
Generally, the advantage of using a binary search over a linear search increases as the size of the list increases.
A large data set contains information about all students majoring in computer science in colleges across the United States. The data set contains the following information about each student. The student's gender The state in which the student attends college The student's grade point average on a 4.0 scale Which of the following questions could be answered by analyzing only information in the data set?
How many states have a higher percentage of female computer science majors than male computer science majors attending college in that state?
Many Web browsers allow users to open anonymous windows. During a browsing session in an anonymous window, the browser does not record a browsing history or a list of downloaded files. When the anonymous window is exited, cookies created during the session are deleted. Which of the following statements about browsing sessions in an anonymous window is true?
Items placed in a Web store's shopping cart for future purchase during the anonymous browsing session will not be saved on the user's computer.
Which of the following is considered an unethical use of computer resources?
Purchasing a single-user copy of photo editing software and installing it on all the computers in a computer lab
unethical
Purchasing a single-user copy of photo editing software and installing it on all the computers in a computer lab
Which of the following is a true statement about cloud computing?
Storing data using cloud computing can help ensure that data are not lost if a user's computer stops functioning.
Both online newspapers and social media sites are used to distribute information on the Internet. Which of the following best describes an advantage that online newspapers have over social media sites?
The ability to provide credibility to the information distributed
Which of the following is a characteristic of the fault-tolerant nature of routing on the Internet?
The ability to provide data transmission even when some connections have failed
A user enters a Web address in a browser, and a request for a file is sent to a Web server. Which of the following best describes how the file is sent to the user?
The file is broken into packets for transmission. The packets must be reassembled upon receipt.
A student is recording a song on her computer. When the recording is finished, she saves a copy on her computer. The student notices that the saved copy is of lower sound quality than the original recording. Which of the following could be a possible explanation for the difference in sound quality?
The song was saved using fewer bits per second than the original song.
Which of the following is a true statement about data compression?
There are trade-offs involved in choosing a compression technique for storing and transmitting data.
An Internet service provider (ISP) is considering an update to its servers that would save copies of the Web pages most frequently visited by each user.
Web sites that are not visited frequently might no longer be accessible to users.
An Internet service provider (ISP) is considering an update to its servers that would save copies of the Web pages most frequently visited by each user. Which of the following is LEAST likely to occur as a result of the update?
Web sites that are not visited frequently might no longer be accessible to users.
According to the domain name system (DNS), which of the following is a subdomain of the domain example.com?
about.example.com
