AP Computer Science Principles Impact of Computing — Worked Answer Explanations

Unit 5 · 12 questions explained

Below is a complete answer key for our AP Computer Science Principles Impact of Computing practice questions. For each question you'll find the correct choice, a full written explanation of how to get there, and — for every wrong answer — a short note on exactly why it's tempting and where it goes wrong. Reading these straight through is one of the fastest ways to find the gaps in a unit before exam day.

Prefer to test yourself first? Take the timed Impact of Computing practice test and come back here to review, or head back to the Impact of Computing unit overview.

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Question 1 · Easy
A new app allows patients in rural areas to consult with doctors via video call, eliminating the need to travel long distances to a clinic. Which of the following BEST describes this computing innovation?
- A
  A harmful effect of computing, because it reduces face-to-face interactions between doctors and patients.
  Why not A: While remote care has limitations, the primary effect described — providing access to healthcare for people who otherwise could not travel to a clinic — is beneficial.
- B
  A beneficial effect of computing, because it increases access to healthcare for people in underserved areas.Correct
- C
  Neither beneficial nor harmful, because it only replaces existing in-person visits.
  Why not C: The patients described previously had no practical access to a doctor; this is not a replacement but a new access point — a net benefit.
- D
  A harmful effect of computing, because doctors can now see more patients and may provide lower-quality care.
  Why not D: This speculative negative does not describe the primary effect stated in the scenario; the question asks about the described effect.
Explanation
Computing innovations frequently improve access to services that were previously unavailable or impractical. Telemedicine expands healthcare access to rural and underserved populations — a clear beneficial effect. Many AP CSP questions ask you to identify whether a described effect is beneficial or harmful based on the specific impact described in the scenario.

Key takeaway
Beneficial computing effects expand access, improve efficiency, or solve problems; evaluate the specific described effect, not hypothetical negatives.
Question 2 · Easy
Which of the following BEST describes the digital divide?
- A
  The difference in processing speed between old computers and new computers.
  Why not A: Speed differences between hardware generations are a technical concept, not the digital divide.
- B
  The gap between people who have access to computers and the Internet and those who do not, often tied to income, geography, or education.Correct
- C
  The distinction between hardware (physical devices) and software (programs).
  Why not C: Hardware vs. software is a fundamental computing concept, not a social disparity.
- D
  The security risk created when data is transmitted over public networks.
  Why not D: Security risks over public networks describe a cybersecurity concept, not the social issue of unequal technology access.
Explanation
The digital divide refers to the socioeconomic gap between populations that have reliable access to computers, smartphones, and high-speed Internet and those that do not. Factors include income level, geographic location (rural vs. urban), age, and education. The divide creates unequal access to online education, job opportunities, government services, and healthcare information.

Key takeaway
The digital divide is the unequal access to computing and the Internet based on socioeconomic factors like income, geography, and education.
Question 3 · Easy
A company trains a facial recognition system using a dataset of photographs. The dataset contains mostly photographs of people with lighter skin tones. As a result, the system is significantly less accurate for people with darker skin tones.

This is an example of:
- A
  A hardware malfunction that prevents the camera from capturing darker skin tones accurately.
  Why not A: The problem is in the training dataset, not hardware; modern cameras capture all skin tones and the bias is in the algorithm.
- B
  Computing bias caused by a non-representative training dataset.Correct
- C
  Lossy compression that degrades image quality for some users.
  Why not C: Compression affects file size and image quality uniformly; it is not the cause of reduced accuracy for specific demographic groups.
- D
  An intentional design decision to reduce the system's scope.
  Why not D: The scenario does not describe an intentional design decision; the reduced accuracy results from unintentional bias in the dataset.
Explanation
When a machine learning system is trained on data that overrepresents certain groups and underrepresents others, it learns the patterns in the majority group much better. This is computing bias: the algorithm produces less accurate results for underrepresented groups — not because of any hardware issue or intentional choice, but because the training data was not representative of the full population.

Key takeaway
Computing bias from non-representative training data causes systems to perform less accurately for underrepresented groups.
Question 4 · Easy
A citizen science project asks volunteers worldwide to classify galaxy shapes in telescope photographs by viewing images on a website. Thousands of volunteers each classify a few images, producing a large labeled dataset researchers could not create alone.

This is an example of:
- A
  Phishing — deceiving volunteers into revealing personal information.
  Why not A: Phishing is a cyberattack technique; this scenario describes legitimate volunteer participation in a research project.
- B
  Crowdsourcing — distributing a task across many people to accomplish something impractical for one person or team.Correct
- C
  Parallel computing — running the same algorithm on multiple processors simultaneously.
  Why not C: Parallel computing uses processors; crowdsourcing uses human volunteers. These are fundamentally different approaches.
- D
  Open source software — publishing code so anyone can view and contribute to it.
  Why not D: Open source refers to software licensing and collaborative code development, not distributing classification tasks to volunteers.
Explanation
Crowdsourcing leverages the collective effort of a large group — typically via the Internet — to accomplish tasks that would be impractical for a small team. Galaxy Zoo (the real project this describes) has classified millions of galaxy images using volunteer classifiers. The scale of participation produces a dataset that no research team could label alone in a reasonable timeframe.

Key takeaway
Crowdsourcing distributes tasks across many people via the Internet, enabling scale that is impractical for individuals or small teams.
Question 5 · Easy
A student downloads a song from a website that offers "free music." The song was uploaded without the artist's permission and is available for free download. Which of the following BEST describes the legal and ethical issue?
- A
  The download is legal because the student is not selling the song or making money from it.
  Why not A: Copyright law protects creators regardless of whether the downloader profits; downloading without authorization infringes copyright even if personal use is involved.
- B
  The download violates the artist's intellectual property rights because the artist did not authorize the distribution.Correct
- C
  The download is ethical because music should be freely accessible to everyone.
  Why not C: While access to culture has social value, downloading copyrighted material without authorization is an infringement of the creator's rights, which is an ethical and legal issue regardless of one's views on music access.
- D
  The website, not the student, is responsible for any infringement, so the download has no ethical implications for the student.
  Why not D: The website hosts infringing content, but knowingly downloading unauthorized copyrighted material also raises ethical questions for the downloader.
Explanation
Copyright gives creators exclusive rights to reproduce and distribute their work. Uploading a song without permission infringes these rights; downloading a known unauthorized copy also raises ethical concerns. Computing makes copying and distributing media trivially easy, which is why intellectual property is a major topic in the impact of computing.

Key takeaway
Copyright protects creators' exclusive rights to distribute their work; unauthorized distribution or downloading violates these rights.
Question 6 · Easy
Which of the following is an example of a Creative Commons license providing more freedom than standard copyright?
- A
  A Creative Commons license prevents anyone from using a work without paying the creator a fee.
  Why not A: Standard copyright already restricts use; Creative Commons licenses grant MORE permissions than standard copyright, often allowing free use under certain conditions.
- B
  A Creative Commons Attribution (CC-BY) license allows anyone to share and adapt the work as long as they credit the original creator.Correct
- C
  A Creative Commons license requires all users of a work to pay royalties to the creator.
  Why not C: Creative Commons licenses typically allow use without payment (though some restrict commercial use); mandatory royalties describe commercial licensing, not CC.
- D
  A Creative Commons license is identical to putting a work in the public domain — all rights are waived.
  Why not D: CC0 (public domain dedication) waives rights, but most CC licenses retain some rights (e.g., requiring attribution). They are not identical to full public domain.
Explanation
Standard copyright restricts nearly all uses without explicit permission. Creative Commons licenses grant specific permissions in advance. CC-BY (Attribution) allows anyone to share, copy, remix, and build on the work — even commercially — as long as they credit the original creator. This is far more permissive than standard copyright while still protecting the creator's right to attribution.

Key takeaway
Creative Commons licenses pre-grant specific permissions; CC-BY allows sharing and adaptation with credit — more freedom than standard copyright.
Question 7 · Medium
A social media platform's recommendation algorithm suggests content based on a user's past engagement. Over time, the user primarily sees content that reinforces their existing beliefs.

Which of the following BEST describes a potential harmful effect of this computing innovation?
- A
  The algorithm is a beneficial innovation because it shows users content they find interesting, increasing engagement.
  Why not A: While increased engagement is a benefit for the platform, the question asks about potential harmful effects; greater engagement from a narrow filter bubble is a trade-off, not purely beneficial.
- B
  The algorithm creates a "filter bubble" that limits exposure to diverse viewpoints, which can reinforce misinformation and reduce critical thinking.Correct
- C
  The algorithm is harmful only because it requires too much computing power, wasting energy.
  Why not C: Energy use is a separate environmental concern; the described harm in the scenario is the narrowing of information exposure, not energy consumption.
- D
  The algorithm is harmful because it requires users to pay subscription fees to see recommended content.
  Why not D: The scenario does not mention subscription fees; the described effect is the narrowing of content diversity from personalized recommendation.
Explanation
Recommendation algorithms optimize for engagement — users engage more with content that confirms existing beliefs. This creates a filter bubble: users see less diverse information, encounter less challenge to their views, and may be more susceptible to misinformation that aligns with their existing beliefs. While personalization has benefits, the reduction in information diversity is a documented harmful societal effect of recommendation systems.

Key takeaway
Recommendation algorithms can create filter bubbles that limit exposure to diverse viewpoints, reinforcing bias and potential misinformation.
Question 8 · Medium
A user receives an email that appears to be from their bank, asking them to click a link and confirm their account password due to "suspicious activity." The link leads to a fake website that looks identical to the real bank's website.

This attack is BEST described as:
- A
  A denial-of-service (DoS) attack — overwhelming the bank's server with traffic.
  Why not A: A DoS attack targets server availability, not user credentials; this attack deceives a specific user into revealing their password.
- B
  Malware — software that automatically infects the user's device when the email is opened.
  Why not B: The scenario describes credential theft through deception (a fake website), not automatic device infection.
- C
  Phishing — tricking a user into revealing credentials by impersonating a trusted entity.Correct
- D
  A brute-force attack — systematically trying all possible passwords until the correct one is found.
  Why not D: A brute-force attack does not involve user deception; it tries passwords computationally. Phishing tricks the user into revealing the password voluntarily.
Explanation
Phishing uses social engineering — impersonating a trusted entity (a bank, employer, or website) to trick users into revealing sensitive information. Key indicators in this scenario: an urgent-sounding email, a link to a convincing-but-fake website, and a request for credentials. Phishing is one of the most common and effective cyberattacks because it exploits human trust rather than technical vulnerabilities.

Key takeaway
Phishing impersonates trusted entities to trick users into revealing credentials; it exploits human trust, not technical vulnerabilities.
Question 9 · Medium
A nonprofit creates an online platform connecting volunteers with local food banks, matching volunteer skills and schedules with food bank needs. The platform was built using donated server time and open-source software.

Which of the following BEST explains how this computing innovation addresses both a social problem AND a concern about equitable access to computing resources?
- A
  It addresses neither: the platform still requires users to have Internet access, which not everyone has.
  Why not A: While the digital divide is a valid concern, the question asks which answer BEST explains addressing both problems — this option dismisses both without considering the partial benefit.
- B
  It addresses the social problem (food insecurity) by matching volunteers with food banks, and the equitable-access concern by using donated resources and open-source software, keeping costs low for the nonprofit.Correct
- C
  It addresses the social problem only; equitable access to computing requires giving every person a free device and internet connection.
  Why not C: "Equitable access" in the question refers to making computing resources accessible to the nonprofit (donated infrastructure, open-source), not universal device distribution.
- D
  It addresses the equitable-access concern only; food banks already have enough volunteers without a computing platform.
  Why not D: Food banks routinely struggle to coordinate volunteer scheduling; the platform addresses a genuine coordination problem as well as the infrastructure cost.
Explanation
The platform addresses food insecurity (a social problem) by efficiently connecting volunteers with food banks. It also addresses the concern that nonprofits often cannot afford costly software licenses and infrastructure: using donated server time and open-source software eliminates these barriers, making computing resources equitably accessible to organizations with limited budgets. Both dimensions are addressed simultaneously.

Key takeaway
Open-source software and donated infrastructure reduce computing access barriers for nonprofits, enabling beneficial social applications at low cost.
Question 10 · Hard
A company's website is attacked by a botnet — thousands of compromised computers simultaneously send requests to the website, overwhelming its server and making it unavailable to legitimate users.

This attack is called a:
- A
  SQL injection attack
  Why not A: SQL injection inserts malicious SQL queries into a web form to manipulate a database; it does not involve flooding a server with traffic.
- B
  Distributed Denial-of-Service (DDoS) attackCorrect
- C
  Man-in-the-middle attack
  Why not C: A man-in-the-middle attack intercepts communication between two parties; it does not describe overwhelming a server with traffic.
- D
  Phishing attack
  Why not D: Phishing deceives individuals into revealing credentials; a botnet flooding a server with requests is a DDoS attack.
Explanation
A Distributed Denial-of-Service (DDoS) attack uses many computers — often compromised into a botnet — to flood a target server with more requests than it can handle. The server's resources are exhausted, and legitimate users cannot reach the service. "Distributed" means the traffic comes from many sources simultaneously, making it much harder to block than a single-source attack.

Key takeaway
A DDoS attack uses a botnet (many compromised computers) to flood a server with requests, denying service to legitimate users.
Question 11 · Hard
A researcher studying online misinformation downloads 10 million public tweets using Twitter's API and analyzes which types of false claims spread fastest. The tweets are publicly posted but the users did not know their data would be used for research.

Which of the following BEST represents the ethical tension in this scenario?
- A
  There is no ethical tension — public data can always be used for any purpose without ethical concerns.
  Why not A: Data being publicly accessible does not eliminate ethical obligations; researchers have responsibilities around informed consent, privacy expectations, and potential harms.
- B
  The ethical tension is between the public benefit of misinformation research and the users' reasonable expectation that their posts, while public, would not be systematically collected and analyzed without consent.Correct
- C
  The only ethical issue is that the researcher is using too much storage space by downloading 10 million tweets.
  Why not C: Storage consumption is a resource concern, not the ethical issue. The tension is about consent, privacy expectations, and potential for misuse.
- D
  The ethical tension is entirely resolved by Twitter's terms of service, which permit API access to public tweets.
  Why not D: Legality (permitted by terms of service) and ethics are not the same. An action can be legally permitted and still raise ethical concerns about user expectations and data use.
Explanation
The core tension is between research value (understanding misinformation to combat it) and user autonomy/privacy norms. Though tweets are public, users typically expect them to be seen by followers, not systematically harvested for large-scale analysis. Aggregating millions of posts can reveal sensitive patterns about individuals or communities. Many research ethics frameworks require IRB approval and consideration of informed consent even for public data, precisely because legality and ethics diverge here.

Key takeaway
Public accessibility does not resolve all ethical concerns; systematic collection of public data still raises issues of user consent and reasonable privacy expectations.
Question 12 · Hard
A government proposes using AI-powered surveillance cameras throughout a city to automatically identify and track individuals by face in real time to reduce crime.

A civil liberties advocate argues this innovation has significant harmful effects. Which of the following BEST articulates the advocate's concern?
- A
  The cameras use too much electricity, making them environmentally harmful.
  Why not A: While energy use is a concern, a civil liberties advocate would focus on rights and freedoms, not electricity consumption.
- B
  Mass real-time facial recognition enables pervasive government surveillance that chills free expression and assembly, disproportionately targets marginalized communities through known algorithmic biases, and creates a massive data collection that could be misused.Correct
- C
  The cameras might reduce tourism because visitors feel uncomfortable being photographed.
  Why not C: Tourism impact is an economic concern; it is not the civil liberties argument against mass surveillance.
- D
  The AI may misidentify celebrities, which could create legal liability for the government.
  Why not D: Celebrity misidentification is a narrow technical concern; civil liberties advocates raise broader structural concerns about systematic erosion of privacy and free expression.
Explanation
Mass AI facial recognition surveillance raises interconnected civil liberties concerns: (1) chilling effect — people may avoid legal protests or gatherings if they know they are identified and tracked; (2) algorithmic bias — facial recognition is significantly less accurate for darker-skinned individuals, women, and other groups, leading to disproportionate scrutiny; (3) data misuse — a government database of everyone's movements is a powerful tool for oppression if access controls fail or government priorities change. These harms can occur even if the stated goal (crime reduction) has merit.

Key takeaway
Mass surveillance via facial AI raises civil liberties concerns: chilling effects on expression, algorithmic bias against marginalized groups, and risks of data misuse.