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100+ Free AP Computer Science Principles Practice Questions

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A company makes its software's data formats and interfaces publicly documented so other developers can build compatible tools. This openness most directly promotes:

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Key Facts: AP Computer Science Principles Exam

70

multiple-choice questions on the end-of-course exam

College Board

120 min

time limit for the multiple-choice section

College Board

70%

of the AP score from multiple choice; 30% from the Create task

College Board

30-35%

exam weight of Algorithms and Programming, the largest big idea

College Board CED

1-5

AP score scale; a 3 or higher typically earns college credit

College Board

No penalty

for wrong answers, so every question should be answered

College Board

The AP Computer Science Principles end-of-course exam has 70 multiple-choice questions answered in 120 minutes, which counts for 70% of the AP score; the Create performance task supplies the other 30%. Questions span five big ideas, with Algorithms and Programming weighted most heavily (30-35%) and Impact of Computing second (21-26%). The exam is scored 1-5, and most colleges grant credit for a 3 or higher. There is no penalty for wrong answers, so students should answer every question (source: College Board, AP Central).

Sample AP Computer Science Principles Practice Questions

Try these sample questions to test your AP Computer Science Principles exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A team of students is developing a program together. One student frequently dismisses others' ideas without discussion, and progress slows. According to AP CSP, what is the most effective collaborative practice to improve their development process?
A.Have the most experienced student write all the code alone
B.Stop discussing the design and immediately start coding to save time
C.Solicit and incorporate feedback from multiple team members and consider different perspectives
D.Assign blame for the slow progress before continuing
Explanation: Effective collaboration in program development means soliciting feedback from many people and considering multiple perspectives, which produces programs that are more usable, accessible, and correct. Diverse input helps surface errors and design flaws early. This is a core practice in Big Idea 1, Creative Development.
2In an iterative and incremental development process, what is the recommended approach to building and improving a program over time?
A.Write the entire program at once and only test it after it is fully complete
B.Plan the program completely on paper and never change the plan once coding begins
C.Repeatedly design, implement, and test small pieces, refining the program through cycles of feedback
D.Release the program to users before any testing is done
Explanation: An iterative and incremental process repeats phases of investigating, designing, implementing, and testing in cycles, refining the program based on feedback at each step. This lets developers catch problems early and adapt the design. It contrasts with trying to build everything correctly in a single pass.
3A program is intended to count the number of even values in a list, but it returns an incorrect count. The programmer adds statements to display intermediate values while the program runs. What debugging technique is this?
A.Refactoring the program into procedures
B.Compressing the program's data
C.Using print/display statements to trace program state and locate the error
D.Adding more comments to the code
Explanation: Displaying intermediate values while a program runs is a common debugging technique that lets the programmer trace the program's state and find where the actual behavior diverges from the expected behavior. It helps locate logic errors. This is part of identifying and correcting errors in Big Idea 1.
4Which of the following best describes a logic error in a program?
A.The program will not run because of a misspelled keyword
B.The program cannot access the Internet
C.The program runs but produces incorrect or unexpected results
D.The program uses too much storage on the device
Explanation: A logic error occurs when a program runs without crashing but produces incorrect results because the algorithm or instructions are flawed. The syntax is valid, so it compiles or runs, but the output is wrong. This contrasts with a syntax error, which prevents the program from running.
5A development team documents the purpose and function of each part of their program as they build it. Why is this documentation valuable during creative development?
A.It makes the program run faster
B.It automatically removes all logic errors
C.It helps collaborators and future developers understand, maintain, and modify the program
D.It is required for the program to compile
Explanation: Program documentation describes how the code works and its intended purpose, which helps the original developers, collaborators, and future maintainers understand and modify the program. Good documentation supports collaboration and long-term maintenance. It does not change how fast the program runs.
6When defining the purpose of a new program, which question is most directly addressed by a clear program specification?
A.What hardware brand should run the program
B.Which programmer is the most skilled on the team
C.What problem the program solves and what inputs and outputs it has
D.How many lines of comments to include
Explanation: A program's specification or description identifies the problem it is meant to solve and the inputs it accepts and outputs it produces. Defining purpose, function, inputs, and outputs guides the rest of development. This clarity helps the team build the right program.
7Two programmers test a program by giving it many different inputs, including unusual or extreme values, to see how it behaves. This practice of choosing test inputs is best described as identifying:
A.The fastest possible algorithm
B.A data compression scheme
C.The program's Internet protocol
D.Test cases that cover typical, boundary, and edge conditions
Explanation: Good testing involves selecting test cases that cover normal inputs as well as boundary and edge conditions, because these are where errors are most likely to appear. Testing with a variety of inputs increases confidence that the program behaves correctly. This is part of correcting errors in creative development.
8A program produces a visualization, a sound, or an interactive experience. In AP CSP terms, such a program is best categorized as a computing:
A.Protocol
B.Bandwidth
C.Artifact
D.Bias
Explanation: A computing artifact is anything created by a human using a computer, such as a program, image, audio, video, presentation, or web page. Programs that produce visualizations, sounds, or interactive experiences are computing artifacts. The term is central to creative development.
9During development, a programmer reuses an existing, well-tested procedure rather than writing new code for the same task. What is the primary benefit of this practice?
A.It guarantees the program will have no impact on society
B.It makes the program impossible to debug
C.It reduces development time and the chance of introducing new errors
D.It removes the need for any testing
Explanation: Reusing existing, well-tested code or procedures saves development time and reduces the chance of introducing new errors, since the reused code has already been verified. This supports efficient, reliable development. It is a key idea in both creative development and abstraction.
10A team disagrees about a design decision. One member suggests creating a quick prototype to test the idea before committing to it. How does prototyping support the creative development process?
A.It permanently locks in the first design choice
B.It eliminates the need for collaboration
C.It lets the team test and evaluate ideas early, gathering feedback before full implementation
D.It increases the program's data compression ratio
Explanation: Building a prototype lets a team test and evaluate a design idea early and gather feedback before investing in a full implementation. This is part of the iterative process and helps avoid costly mistakes. Prototypes make abstract design choices concrete and testable.

About the AP Computer Science Principles Exam

AP Computer Science Principles is an introductory college-level computing course administered by the College Board. The course is organized around five big ideas: Creative Development, Data, Algorithms and Programming, Computer Systems and Networks, and the Impact of Computing. The AP score (1-5) combines a 70-question multiple-choice end-of-course exam (70% of the score) with the Create performance task (30%). This practice bank focuses on the multiple-choice section.

Questions

70 scored questions

Time Limit

2 hours (120 minutes) for the multiple-choice section

Passing Score

Scored 1-5; a 3 or higher typically earns college credit

Exam Fee

About $99 per exam (2025-26, US) (College Board)

AP Computer Science Principles Exam Content Outline

10-13%

Creative Development

Collaborative, iterative program development; program design, function, and purpose; and identifying and correcting errors.

17-22%

Data

Binary representation of numbers and data, data compression, extracting information from data, and using programs with data.

30-35%

Algorithms and Programming

Variables, data abstraction, algorithms, sequencing, selection, iteration, lists, procedures, libraries, simulations, and efficiency.

11-15%

Computer Systems and Networks

The Internet, fault tolerance, redundancy, protocols, and parallel and distributed computing.

21-26%

Impact of Computing

Beneficial and harmful effects, the digital divide, computing bias, crowdsourcing, legal and ethical concerns, and safe computing.

How to Pass the AP Computer Science Principles Exam

What You Need to Know

  • Passing score: Scored 1-5; a 3 or higher typically earns college credit
  • Exam length: 70 questions
  • Time limit: 2 hours (120 minutes) for the multiple-choice section
  • Exam fee: About $99 per exam (2025-26, US)

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

AP Computer Science Principles Study Tips from Top Performers

1Master the AP CSP Exam Reference Sheet — the pseudocode and block notation for assignment, lists, procedures, MOD, and robot commands appear throughout the multiple-choice section.
2Spend the most review time on Algorithms and Programming since it is the largest big idea (30-35%); practice tracing code, lists, and conditionals by hand.
3Know the Impact of Computing vocabulary cold (digital divide, computing bias, PII, crowdsourcing, Creative Commons) because it is the second-largest big idea.
4Practice converting between binary, decimal, and understanding lossy versus lossless compression for the Data big idea.
5Answer every question — there is no guessing penalty — and flag time-consuming code-tracing items to return to later.

Frequently Asked Questions

How many questions are on the AP Computer Science Principles exam?

The end-of-course exam has 70 multiple-choice questions answered in 120 minutes. This section counts for 70% of the AP score; the Create performance task makes up the other 30%.

How is AP Computer Science Principles scored?

AP CSP is scored on the standard AP scale of 1 to 5. The 70-question multiple-choice section is 70% of the score and the Create performance task is 30%. A score of 3 or higher is generally considered passing and often earns college credit.

What are the five big ideas in AP CSP?

The five big ideas are Creative Development, Data, Algorithms and Programming, Computer Systems and Networks, and the Impact of Computing. Algorithms and Programming is weighted most heavily on the exam at 30-35%.

Is there a penalty for wrong answers on AP CSP?

No. There is no penalty for incorrect answers on the multiple-choice section, so you should answer every question even if you have to guess.

Do I need to know a specific programming language for AP CSP?

No single language is required. The exam uses both a text-based pseudocode and a block-based notation defined in the AP CSP Exam Reference Sheet, so you only need to understand the provided constructs.

How much does the AP exam cost?

The standard AP exam fee in the United States is about $99 per exam for 2025-26. Fee reductions are available for eligible students, and some schools cover part of the cost.