AP Computer Science Principles Premium: 6 Practice Tests + Comprehensive Review + Online Practice (2021)

Name: AP Computer Science Principles Premium: 6 Practice Tests + Comprehensive Review + Online Practice (2021)
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Author: Hunter Harris

AP Computer Science Principles Premium: 6 Practice Tests + Comprehensive Review + Online Practice (2021) provides step-by-step explanations to real exam questions, making complex topics easier to understand.

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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 eBook on screen. No part of
this text may be reproduced, transmitted, downloaded, decompiled, reverse
engineered, or stored in or introduced into any information storage and retrieval
system, in any form or by any means, whether electronic or mechanical, now
known or hereinafter invented, without the express written permission of the
publisher.
Published by Kaplan, Inc., d/b/a Barron’s Educational Series
750 Third Avenue
New York, NY 10017
www.barronseduc.com
ISBN: 978-1-5062-8040-0
10 9 8 7 6 5 4 3 2 1
Kaplan, Inc., d/b/a Barron’s Educational Series print books are available at special
quantity discounts to use for sales promotions, employee premiums, or
educational purposes. For more information or to purchase books, please call the
Simon & Schuster special sales department at 866-506-1949.2

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
Relational and Boolean Operators
The Robot4

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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
Beneficial and Harmful Effects
Human Bias
Crowdsourcing5

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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, with three more practice exams available online.
Acknowledgments
This book is dedicated to the class of 2020. You would have rocked this test.7

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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
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%9

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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
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 scoring10

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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.
Six 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.11

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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.12

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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
(C) 11 3
(D) 3 11
2. When writing a program, what is true about program documentation?13

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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.
(B) Conflicts in the working styles within the group will decrease staff
morale.
(C) With multiple people looking over code, errors can be quickly fixed.
(D) Multiple people with different life experiences can see the code and
give perspective on the ways the original programmer can decrease
bias.14

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