AP Computer Science Principles with 3 Practice Tests (2021)

Name: AP Computer Science Principles with 3 Practice Tests (2021)
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Author: Hunter Harris

Ensure you're fully prepared with AP Computer Science Principles with 3 Practice Tests (2021), a certification guide that covers critical exam topics.

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© Copyright 2021, 2020 by Kaplan, Inc., d/b/a Barron’s Educational Series
All rights reserved under International and Pan-American Copyright
Conventions. By payment of the required fees, you have been granted the
non-exclusive, non-transferable right to access and read the text of this
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invented, without the express written permission of the publisher.
Published by Kaplan, Inc., d/b/a Barron’s Educational Series
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www.barronseduc.com
ISBN: 978-1-5062-8041-7
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Computing Innovations
Collaboration
How Programs Function
Program Input
Development Process
Creative Development Questions
Answer Key
Answers Explained
3 Big Idea 2: Data
Bits Represent Data
Number Systems
Various Errors
Lossy and Lossless Data Compression
Information Extracted from Data
Privacy Concerns
Data Questions
Answer Key
Answers Explained
4 Big Idea 3: Algorithms and Programming
What Is an Abstraction?
Mathematical Operators
How to Solve Modulus
Assignment Operators
Lists
Display Operators
Input Operators

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Relational and Boolean Operators
The Robot
The Swap
Searching
Algorithms and Programming Questions
Answer Key
Answers Explained
Big Idea 3: Algorithms and Programming Part 2
Programming
Flowcharts
Lists
Procedures
Algorithms and Programming Questions Part 2
Answer Key
Answers Explained
5 Big Idea 4: Computer Systems and Networks
Computing Devices
Autonomous Systems of the Internet
Fault Tolerance
Efficiency of Solutions
Computer Systems and Networks Questions
Answer Key
Answers Explained
6 Big Idea 5: Impact of Computing
The World Wide Web
Digital Divide

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Beneficial and Harmful Effects
Human Bias
Crowdsourcing
Legal and Ethical Concerns
Safe Computing
Impact of Computing Questions
Answer Key
Answers Explained
PRACTICE TESTS
Practice Test 1
Answer Key
Answers Explained
Practice Test 2
Answer Key
Answers Explained
APPENDIX
Appendix A Create Performance Task Directions
Appendix B Create Performance Task Rubric
Appendix C AP Computer Science Principles Exam Reference Sheet

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T
Preface
his book is aimed at students taking the AP Computer Science
Principles exam and is designed to help students prepare for exam
topics, regardless of what computer language or method they were taught.
The book provides in-depth instructions on how to complete the Create
Performance Task with five complete written and coded examples. We have
included sample responses that earn high scores and sample responses that
earn low scores. The provided sample responses are intended to serve as
guiding resources only. Do NOT copy the sample responses! The College
Board does rigorous checks for plagiarism.
The questions and examples all reflect the style of recent exam
questions and cover the essential knowledge topics outlined by the College
Board. For the benefit of students and instructors, we have included one
diagnostic test and two practice exams in this book.
Acknowledgments
This book is dedicated to the class of 2020. You would have rocked this
test.

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Introduction
GENERAL INFORMATION ABOUT THE
EXAM
The AP Computer Science Principles exam is a two-hour multiple-choice
exam with 70 questions covering five Big Ideas accompanied by a
performance task containing three submissions. The College Board
recommends you submit your performance task on April 15, with a due date
of approximately April 30. After your teacher sets up your College Board
account, you will be able to submit your performance task starting
December 3. I recommend you submit your performance task well before
the April 30 deadline.
Because the College Board is constantly tweaking the dates, check for
current dates at https://apstudent.collegeboard.org/apcourse/ap-computer-
science-principles
Content of Class
Performance task: 30% of AP Grade
Guaranteed 12 hours of classroom time to finish Program Code
Written Responses
Video of at least one significant part of your program running End of
Course exam: 70% of AP Grade
2 hours

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70 multiple-choice questions, paper and pencil exam Creative
Development 10–13%
Data 17–22%
Algorithms and Programming 30–35%
Computer Systems and Networks 11–15%
Impact of Computing 21–26%
Some exam questions may be aligned to more than one learning objective.
For example, a question on programming might implement an algorithm
and contain an abstraction.
HINTS FOR TAKING THE EXAM
The Multiple-Choice Section
The multiple-choice questions are worth 70% of your score and are
administrated at the end of the school year. There is no penalty for wrong
answers. So answer every question, even if you have to guess.
You have a little more than 1.7 minutes per question. You should have
enough time to answer all questions on this test, and you will most likely
have enough time at the end to go back to difficult questions.
The 70 questions are fatiguing. You should practice at least one of the
sample tests given in one sitting. Robot and programming questions can be
simplified by hand-tracing the code.
People score the performance task, while the EOC exam is scored by
machine. The test is independent of the computer language used, but there
are both text-based programming questions and block-based programming
questions.
The Performance Task
Details on how to create a College Board account and how to submit your
performance task can be found at
https://apstudent.collegeboard.org/takingtheexam/about-digital-portfolio

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Create Task
Allow your own interests to drive your choice of computing program.
Before you start writing, make sure you have read and understand the
questions and how these questions are graded. There are small changes in
the question each year, and the newest versions of both the questions and
the scoring criteria can be found at
https://apcentral.collegeboard.org/pdf/ap-csp-student-task-directions.pdf
Your program code should represent the results of explorations that go
beyond the examples presented in class.
Again, the deadline for submission is April 30. The College Board
recommends submitting by April 15.
HOW TO USE THIS BOOK
Examples of each section of the Create Performance Task are given in this
book. You should not plagiarize examples but, instead, use them as a model
of how to score high on the College Board rubric.
Three complete practice exams are provided in the book. One exam is at
the start of the book and may be used as a diagnostic test. It is accompanied
by a diagnostic chart that refers you to related topics in the review book.
Two exams are at the end of the book.
Each of the exams has an answer key and detailed explanations for the
multiple-choice questions.

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Diagnostic Test
The exam that follows has the same format as that used on the
actual AP exam. There are two ways you may use it:
1. Use it as a diagnostic test before you start reviewing.
Following the answer key is a diagnostic chart that relates
each question to sections that you should review. In addition,
complete explanations are provided for each solution.
2. You can also use it as a practice exam when you have
completed your review.

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Diagnostic Test
Time: 120 minutes
70 questions
DIRECTIONS: Each of the questions or incomplete statements
below is followed by four suggested answers or completions. Select
the one that is best in each case and record your answer on a
separate sheet of paper.
1. Consider the following code segment, which uses the variables a and
c.
a ← 3
a ← a + 5
c ← 3
a ← c + a
DISPLAY(a)
DISPLAY(c)
What is displayed when running the code segment?
(A) 3 3
(B) 3 8

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(C) 11 3
(D) 3 11
2. When writing a program, what is true about program documentation?
I. Program documentation is useful while writing the program.
II. Program documentation is useful after the program is written.
III. Program documentation is not useful when run speed is a factor.
(A) I only
(B) I and II only
(C) II only
(D) I, II, and III
3. An image stored on a computer contains pixels that represent how
bright the red, green, and blue values are. The most common format
for pixels is to represent the red, green, and blue, using 8 bits, which
vary from 0 to 255. If the current red value is 10011101, what would
be the new value in binary if the red value is increased by 4 in
decimal?
(A) 157BIN
(B) 0100BIN
(C) 10011111BIN
(D) 10100001BIN
4. A programmer is writing software for a diverse set of users. While the
program runs, the programmer wants to meet the needs of all her
customers and reduce potential bias in her algorithms. What would be
the benefit of collaborating with colleagues?
(A) When collaborating, too many people try to lead the group and
not enough members are willing to take a backseat, which will
delay the release of the program.

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