APCSP Abstraction Concepts 4

Question 1

In the AP CSP 'Explore' performance task context, which of the following computing innovations relies most heavily on abstraction?

Accepted Answer

An operating system that manages hardware resources through system calls

Answer

An operating system abstracts hardware complexity behind system calls, so applications don't interact with hardware directly.

Question 2

Which of the following is the BEST reason to create a new abstraction in a program?

Accepted Answer

To group related functionality so it can be reused and understood without implementation details

Answer

Creating an abstraction groups related functionality, promotes reuse, and hides complexity for maintainability.

Question 3

A file system abstraction lets users work with 'files' and 'folders.' What complexity does this hide?

Accepted Answer

The low-level details of how data is stored on magnetic or solid-state media

Answer

File system abstractions hide sector-level disk storage details, presenting a human-friendly folder/file metaphor.

Question 4

Which of the following pairs shows abstraction at TWO different levels?

Accepted Answer

JavaScript code and the web browser's JavaScript engine

Answer

JavaScript code is a higher-level abstraction; the browser's JS engine is the lower-level implementation that executes it.

Question 5

A student writes `average = computeAverage(scores)`. Why is `computeAverage` considered an abstraction?

Accepted Answer

Because the student can use it without knowing how the averaging calculation is implemented

Answer

The function is an abstraction because it hides the summation and division logic behind a single named call.

(APCSP) AP Computer Science Principles Practice Test