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AP Computer Science Principles Unit 1: Creative Development

12 questions

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Unit 1: Creative Development

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Question 1

A student is working on a program that draws shapes on screen. After writing the first version, she notices the circles look slightly off-center. She adjusts a coordinate value, tests again, and the circles look correct. This process BEST illustrates which program development practice?

A.AbstractionB.IterationC.DocumentationD.Compilation

Question 2

A program that reads a list of numbers and finds the maximum value contains the following bug: when all numbers are negative, it always returns 0. A developer adds a test case with the input [-5, -1, -3] expecting the output -1 but gets 0. After investigation, she realizes the maximum variable was initialized to 0 instead of the first list element.

Which of the following describes the COMPLETE process used to find and fix this bug?

A.Testing only — creating a test case that exposed the incorrect output.B.Testing to reveal the bug, then debugging to locate and fix the initialization error.C.Debugging only — investigating the code until the initialization error was found.D.Abstraction — hiding the initialization detail behind a helper method.

Question 3

A developer releases version 1.0 of an app, collects user feedback revealing that the search feature is confusing, and redesigns the search interface for version 2.0. This cycle BEST reflects which principle of program development?

A.Sequential development — completing each phase fully before moving to the next.B.Iterative development — using feedback from each version to improve the next.C.Parallel development — having multiple teams write independent versions simultaneously.D.Abstraction — hiding the complexity of the search algorithm from users.

Question 4

Two students are collaborating on a program. Student A writes the data-storage module and Student B writes the display module. They agree that the display module will call getData() to retrieve values, regardless of how Student A internally stores the data.

This agreement BEST demonstrates which concept?

A.Iteration — repeatedly refining the interface until both students agree.B.Abstraction via a defined interface — the display module interacts with stored data through getData() without needing to know the internal implementation.C.Debugging — finding and fixing errors in the communication between modules.D.Sequential development — Student A must finish completely before Student B can begin.

Question 5

A group of students is designing an app to track school events. They gather requirements by asking students and teachers what features they want before writing any code. This activity is BEST described as which phase of the design thinking process?

A.PrototypingB.TestingC.Empathizing / defining the problemD.Deploying

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Question 6

A student is developing an app to help users log daily exercise. During testing, a user reports: "When I enter 0 minutes of exercise, the app crashes." The student had not considered zero as a valid input.

This situation illustrates which challenge in program development?

A.Compilation errors — the code cannot be translated to machine instructions.B.Undecidable problems — it is theoretically impossible to determine whether any input will cause a crash.C.Incomplete specification — the original program design did not account for all valid inputs, leading to unexpected behavior.D.Hardware failure — the device cannot process a zero value correctly.

Question 7

A team uses a shared online document so all members can see the current project plan and leave comments. Which aspect of collaborative development does this MOST directly support?

A.Abstraction — hiding implementation details from team members who do not need them.B.Communication and transparency — keeping all collaborators informed and allowing asynchronous feedback.C.Compilation — converting the shared plan into machine-readable instructions.D.Testing — verifying that each team member's code produces correct output.

Question 8

Which of the following is an example of DEBUGGING a program?

A.Writing comments to explain what each section of code does.B.Running a program with sample inputs and checking whether the outputs match expected results.C.Identifying that a sorting procedure returns results in the wrong order, locating the comparison that is reversed, and fixing it.D.Planning the structure of a program before writing any code.

Question 9

Which of the following BEST describes the purpose of documentation in a program?

A.To make the program run faster by reducing the number of lines of code.B.To explain the purpose, behavior, and design of the code so that others (and the author later) can understand it.C.To prevent the program from producing errors at runtime.D.To replace the need for testing by describing what the program is supposed to do.

Question 10

Consider the following program development scenario:

A student writes pseudocode describing the algorithm.
She tests the pseudocode logic on paper with sample inputs.
She codes the algorithm in a programming language.
She runs the code and discovers it does not handle the case where the input list is empty.
She revises the code to handle empty input and tests again.

At step 4, the student is performing which activity?

A.Program designB.DocumentationC.TestingD.Abstraction

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Question 11

Which of the following is the BEST description of a program specification?

A.The executable code that makes a program run.B.A document that describes what a program should do, its inputs, outputs, and constraints.C.A visual representation of how data flows through a computer's hardware.D.A list of all the bugs found during testing.

Question 12

Which of the following BEST describes a benefit of collaborating with others during program development?

A.Collaboration guarantees the program will be completed faster than working alone.B.Collaboration eliminates the need for testing because multiple people review the code.C.Collaboration allows different perspectives and areas of expertise to be incorporated, improving the program.D.Collaboration requires that all team members write identical code to avoid conflicts.

AP Computer Science Principles Unit 1: Creative Development — Free with Answer Explanations | Test Practice Hub