AP Computer Science Principles Exam — Questions and Answers

Question 1: Consider this pseudocode: x ← 10 IF x > 5 THEN x ← x + 1 ELSE x ← x - 1 What is the final value of x?

10
11 (Correct answer)
5
9

Correct answer: 11

Since 10 > 5 is TRUE, the THEN branch executes: x becomes 10 + 1 = 11.

Question 2: A student tests their quiz app by entering wrong answers on purpose to see what happens. This testing strategy is called:

Syntax checking
Deployment testing
Boundary/edge case testing (Correct answer)
Unit testing

Correct answer: Boundary/edge case testing

Testing with unexpected or incorrect inputs is edge/boundary case testing, which checks how software handles situations outside normal use.

Question 3: A program stores a student's grade as an integer instead of a floating-point number. What is the main consequence of this choice?

Integer storage requires significantly more memory than floating-point
The program will crash whenever it attempts to read the grade
Fractional grade values will be truncated or rounded, losing precision (Correct answer)
The grade will always be stored incorrectly

Correct answer: Fractional grade values will be truncated or rounded, losing precision

Integers cannot represent fractional parts, so a grade like 87.5 would be stored as 87 or 88, losing the decimal precision.

Question 4: How many unique values can be represented using 4 bits?

32
4
8
16 (Correct answer)

Correct answer: 16

With n bits you can represent 2^n unique values; 2^4 = 16.

Question 5: How does run-length encoding (RLE) compress data?

It replaces sequences of repeated values with a count and the repeated value (Correct answer)
It splits a file into chunks and stores only unique chunks
It removes duplicate words from text files
It converts all data to hexadecimal to save space

Correct answer: It replaces sequences of repeated values with a count and the repeated value

RLE replaces consecutive repeated values (e.g., AAAAAAA) with a shorter representation (e.g., 7A), making it effective for data with long repeated sequences.

Question 6: Which of the following BEST describes a 'deepfake' and its primary concern?

Synthetically generated media that can be used to spread disinformation (Correct answer)
A deep-learning model used for medical diagnostics
A secure method of hiding data within other files
A type of data encryption that is very difficult to break

Correct answer: Synthetically generated media that can be used to spread disinformation

Deepfakes are AI-generated synthetic media that can realistically impersonate real people, enabling the spread of disinformation.

Question 7: Which of the following scenarios BEST demonstrates 'techno-solutionism' and its potential drawbacks?

Using cloud computing to back up data
Designing a database to efficiently store records
Using encryption to protect sensitive files
Assuming a smartphone app can fully solve a complex social problem like homelessness (Correct answer)

Correct answer: Assuming a smartphone app can fully solve a complex social problem like homelessness

Techno-solutionism is the belief that technology alone can fix complex social problems, often ignoring deeper structural causes.

Question 8: Which scenario BEST demonstrates the concept of 'surveillance capitalism'?

A government monitoring known criminals
A company selling user behavioral data to advertisers for profit (Correct answer)
A bank encrypting customer financial records
A school tracking student attendance

Correct answer: A company selling user behavioral data to advertisers for profit

Surveillance capitalism involves collecting and monetizing user data and behaviors as a primary business model.

Question 9: What role does ethics play in Creative Development practice?

It only applies to managers
It guides professional conduct and protects stakeholders (Correct answer)
Ethics is optional in professional settings
It only matters for legal compliance

Correct answer: It guides professional conduct and protects stakeholders

Professional ethics provide frameworks for responsible decision-making, ensuring practitioners act in the best interest of those they serve.

Question 10: Which of the following is NOT a characteristic of a well-designed computational artifact?

It is purposely difficult to use to prevent misuse (Correct answer)
It can be modified and improved over time
It is reliable and produces consistent results
It solves the intended problem

Correct answer: It is purposely difficult to use to prevent misuse

Good artifacts are designed to be usable and accessible, not deliberately difficult; usability is a core design principle.

Question 11: In the context of public-key cryptography, which key should a user share publicly to receive encrypted messages?

Public key (Correct answer)
Session key
Private key
Symmetric key

Correct answer: Public key

In asymmetric encryption, the public key is shared openly so others can encrypt messages that only the holder of the private key can decrypt.

Question 12: A developer uses pseudocode to plan a program before coding it. What is the main benefit of this step?

It automatically generates the final program
It helps clarify logic and structure before worrying about syntax (Correct answer)
Pseudocode runs faster than actual code
It replaces the need for testing

Correct answer: It helps clarify logic and structure before worrying about syntax

Pseudocode lets a developer work out the logic and flow of a program in plain language before dealing with the specific syntax of a programming language.

Question 13: According to De Morgan's first law, NOT(A AND B) is equivalent to:

A OR B
A AND B
NOT(A) AND NOT(B)
NOT(A) OR NOT(B) (Correct answer)

Correct answer: NOT(A) OR NOT(B)

De Morgan's first law states: NOT(A AND B) = NOT(A) OR NOT(B).

Question 14: Which encoding standard assigns a unique number to every character and supports over 140,000 characters from multiple languages and symbol sets?

ASCII
UTF-8 / Unicode (Correct answer)
Base64
EBCDIC

Correct answer: UTF-8 / Unicode

Unicode (with UTF-8 as a common encoding) assigns code points to over 140,000 characters covering most of the world's writing systems.

Question 15: What is the significance of port 443 in internet communication?

It is the default port for HTTPS (secure web) traffic (Correct answer)
It is reserved for DNS queries
It is used for unencrypted HTTP traffic
It handles email delivery via SMTP

Correct answer: It is the default port for HTTPS (secure web) traffic

Port 443 is the standard port for HTTPS connections, which use TLS/SSL encryption.

Question 16: A program filters a list of temperatures, keeping only values above 100°F. After filtering 500 readings, only 3 remain. What is the BEST description of those 3 values?

Normalized data
Representative samples
The median values
Outliers (Correct answer)

Correct answer: Outliers

Values that fall far outside the typical range of a dataset are called outliers, and here only 3 of 500 readings exceeded 100°F.

Question 17: A program stores the value 3.14159 but later retrieves 3.14158999999. What phenomenon caused this discrepancy?

Floating-point representation error (Correct answer)
Data corruption
Integer overflow
Lossless compression artifact

Correct answer: Floating-point representation error

Floating-point numbers cannot always be represented exactly in binary, leading to small rounding errors when storing or performing arithmetic on decimal values.

Question 18: What is the benefit of using a modular design in a large program?

It forces programmers to use only one programming language
It prevents other developers from reading the source code
It makes programs run faster on older computers
It breaks the program into independent procedures that are easier to test and reuse (Correct answer)

Correct answer: It breaks the program into independent procedures that are easier to test and reuse

Modular design allows each procedure to be developed, tested, and reused independently, reducing complexity in large programs.

Question 19: Which of the following scenarios illustrates 'net neutrality' being violated?

An ISP throttling video streaming services to favor its own content (Correct answer)
An ISP offering free public Wi-Fi hotspots
A user downloading large files on a shared network
A website using HTTPS encryption

Correct answer: An ISP throttling video streaming services to favor its own content

Net neutrality requires ISPs to treat all internet traffic equally; throttling competitors violates this principle.

Question 20: A text file contains 1,000 characters, each encoded in ASCII. Approximately how many bytes does it require?

1,000 bytes (Correct answer)
8,000 bytes
2,000 bytes
125 bytes

Correct answer: 1,000 bytes

Standard ASCII uses 7 bits per character, but ASCII files are stored as 8-bit bytes, so 1,000 characters = approximately 1,000 bytes.

Question 21: What is the purpose of a primary key in a database table?

To sort records alphabetically
To uniquely identify each record in the table (Correct answer)
To link two tables through a shared password
To encrypt sensitive fields in the table

Correct answer: To uniquely identify each record in the table

A primary key is a unique identifier for each row in a database table, ensuring no two records have the same key value.

Question 22: A file system abstraction lets users work with 'files' and 'folders.' What complexity does this hide?

The speed of the CPU
The color of the monitor
The network protocol used for internet access
The low-level details of how data is stored on magnetic or solid-state media (Correct answer)

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

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

Question 23: What is the purpose of using a development process when building a program?

To guarantee the program will have no bugs
To make programming take longer
To provide a structured approach that reduces errors and improves collaboration (Correct answer)
To replace the need for testing

Correct answer: To provide a structured approach that reduces errors and improves collaboration

A structured development process (plan, design, implement, test) reduces errors and helps teams collaborate effectively.

Question 24: The condition (x > 0 OR y > 0) is TRUE when:

Both x and y are negative
Neither x nor y is zero
At least one of x or y is positive (Correct answer)
x equals y

Correct answer: At least one of x or y is positive

OR is TRUE when at least one operand is TRUE, so only one of the values needs to be positive.

Question 25: A webpage uses HTTPS instead of HTTP. What additional feature does HTTPS provide?

Encrypted communication between browser and server (Correct answer)
Access to more internet servers
The ability to load images and videos
Faster page load times

Correct answer: Encrypted communication between browser and server

HTTPS uses TLS/SSL encryption to secure the data transmitted between a browser and web server, protecting it from eavesdropping.

Question 26: What is 'digital divide' in the context of computing innovations?

The unequal access to technology and the internet across different socioeconomic groups (Correct answer)
The difference between analog and digital signals
The separation between hardware and software components
The gap between old and new programming languages

Correct answer: The unequal access to technology and the internet across different socioeconomic groups

The digital divide refers to disparities in technology access based on income, geography, or education, creating unequal opportunities.

Question 27: The hexadecimal color code #FF0000 represents which color?

Blue
White
Red (Correct answer)
Green

Correct answer: Red

In RGB hex notation #FF0000 means red channel = 255, green = 0, blue = 0, which is pure red.

Question 28: Boolean logic is fundamental to computing primarily because computers internally represent all data as:

Hexadecimal values
Letters and symbols
Binary digits (0 and 1) (Correct answer)
Decimal numbers (0-9)

Correct answer: Binary digits (0 and 1)

Computers use binary (0s and 1s) at the hardware level, and Boolean logic directly operates on these binary values to perform all computations.

Question 29: What is the result of evaluating the Boolean expression: NOT (TRUE AND FALSE)?

NULL
Undefined
TRUE (Correct answer)
FALSE

Correct answer: TRUE

TRUE AND FALSE evaluates to FALSE, and NOT FALSE evaluates to TRUE.

Question 30: What is 'net neutrality' and why does it matter?

The principle that internet service providers must treat all data equally without blocking or throttling (Correct answer)
A protocol that makes websites load at the same speed worldwide
A law requiring equal pay for tech workers
A rule requiring all websites to have the same design

Correct answer: The principle that internet service providers must treat all data equally without blocking or throttling

Net neutrality prevents ISPs from favoring certain websites or services with faster speeds, ensuring an open and competitive internet.

Question 31: In the context of AP CSP, what does it mean to say a simulation has 'emergent behavior'?

The simulation requires human input at each step
The simulation crashes unexpectedly due to an error
The simulation grows larger over time as data is added
Complex patterns arise from simple rules applied to many interacting agents (Correct answer)

Correct answer: Complex patterns arise from simple rules applied to many interacting agents

Emergent behavior occurs when individual agents following simple rules collectively produce complex, unexpected system-level patterns.

Question 32: Which traversal strategy visits all neighbors of a node before moving to the next level in a graph or tree?

Depth-first search
Linear search
Breadth-first search (Correct answer)
Binary search

Correct answer: Breadth-first search

Breadth-first search (BFS) explores all nodes at the current depth before advancing to nodes at the next depth level.

Question 33: A social media platform uses an algorithm to decide which posts appear in a user's feed. Which digital impact concern does this BEST illustrate?

Bandwidth throttling slowing load times
Data compression reducing quality
Filter bubbles limiting exposure to diverse viewpoints (Correct answer)
Encryption preventing data sharing

Correct answer: Filter bubbles limiting exposure to diverse viewpoints

Algorithmic curation can create filter bubbles by showing users only content that aligns with their existing views.

Question 34: What is 'latency' in a network context?

The time delay between sending a request and receiving a response (Correct answer)
The number of hops a packet takes
The amount of data lost during transmission
The maximum number of simultaneous connections

Correct answer: The time delay between sending a request and receiving a response

Latency is the time it takes for data to travel from the source to the destination, often measured in milliseconds.

Question 35: A team uses user stories during development. What is the primary purpose of a user story?

To document server infrastructure
To list bugs found during testing
To describe a system's internal algorithm
To capture a feature from the end user's perspective (Correct answer)

Correct answer: To capture a feature from the end user's perspective

User stories describe desired functionality from the user's point of view, keeping development user-focused.

Question 36: What is the primary purpose of professional certification in Abstraction Concepts?

To replace practical experience
To meet legal requirements only
To increase salary automatically
To validate competency and knowledge in the field (Correct answer)

Correct answer: To validate competency and knowledge in the field

Certification validates that a professional has met established standards of knowledge and competency in Abstraction Concepts.

Question 37: What is a list in Python?

A key-value pair
An ordered, mutable collection of elements (Correct answer)
An immutable sequence
A single value

Correct answer: An ordered, mutable collection of elements

A Python list is an ordered, mutable sequence that can hold elements of different types, defined with square brackets.

Question 38: Why do programmers use abstraction when building large software systems?

To manage complexity by hiding unnecessary details (Correct answer)
To make programs run faster by removing all function calls
To ensure programs can only run on one type of hardware
To prevent other developers from reading the code

Correct answer: To manage complexity by hiding unnecessary details

Abstraction manages complexity by allowing programmers to focus on high-level design rather than low-level implementation details.

Question 39: What is the relationship between theory and practice in Digital Impact?

They are completely separate
Theory is unnecessary
Practice is unnecessary if you know theory
Theory provides the foundation; practice applies it to real situations (Correct answer)

Correct answer: Theory provides the foundation; practice applies it to real situations

Theory provides the conceptual foundation and principles, while practice involves applying those concepts to real-world situations. Both are essential for competence.

Question 40: Which of the following is NOT a benefit of using abstractions in programming?

Eliminating all possible bugs automatically (Correct answer)
Reducing code complexity
Making programs easier to maintain
Allowing code reuse across different programs

Correct answer: Eliminating all possible bugs automatically

Abstraction helps manage complexity and reuse code, but it does not automatically eliminate bugs.

Question 41: In AP CSP pseudocode, what does the expression LENGTH(myList) return?

The number of elements currently in myList (Correct answer)
The largest value in myList
The sum of all elements in myList
The index of the last element in myList

Correct answer: The number of elements currently in myList

LENGTH(list) returns the total count of elements stored in the list.

Question 42: What is the process of elimination in multiple-choice testing?

Skipping every other question
Ruling out obviously incorrect answers to improve odds (Correct answer)
Removing your first answer
Eliminating questions you don't know

Correct answer: Ruling out obviously incorrect answers to improve odds

Process of elimination involves identifying and removing clearly wrong answers, increasing the probability of selecting the correct answer from remaining options.

Question 43: A software developer is building a new app that requires the ability to perform calculations. Which of the following is the most effective way to design the app’s calculation feature?

Manually write out the calculation each time it’s needed
Store the results of calculations in a database for later use
Use an already-defined function to handle the calculations (Correct answer)
Create a new function every time a calculation is required

Correct answer: Use an already-defined function to handle the calculations

Using an already-defined function promotes efficiency, reusability, and abstraction in software development. It avoids redundant code, reduces the chance of errors, and allows the developer to focus on higher-level logic rather than re-implementing basic functionalities like calculations from scratch.

Question 44: Which of the following is an example of data abstraction?

Debugging a program with a step-through debugger
Compiling source code into machine code
Writing a loop that iterates 10 times
Using a list to represent a collection of student scores without specifying how the list is stored in memory (Correct answer)

Correct answer: Using a list to represent a collection of student scores without specifying how the list is stored in memory

Using a list to represent scores without knowing the underlying memory layout is data abstraction.

Question 45: A programmer documents each function with a description of its inputs, outputs, and purpose. This practice primarily helps with:

Preventing all runtime errors
Reducing the number of variables needed
Making code maintainable and understandable for future developers (Correct answer)
Making the program run faster

Correct answer: Making code maintainable and understandable for future developers

Documentation helps current and future developers understand what each function does without reading all the implementation code.

Question 46: Why might a scientist run the same simulation hundreds of times with different random seeds?

To collect a range of outcomes and analyze the distribution of results (Correct answer)
To find the fastest possible outcome
To reduce the file size of the output data
To ensure the simulation code has no bugs

Correct answer: To collect a range of outcomes and analyze the distribution of results

Running many trials with different random seeds gives a statistical distribution of outcomes rather than a single result.

Question 47: What is the role of DNS (Domain Name System) in the operation of the internet?

It stores and retrieves data from websites
It ensures the internet connection is fast and reliable
It converts domain names (like www.example.com) into IP addresses (Correct answer)
It provides security by encrypting internet traffic

Correct answer: It converts domain names (like www.example.com) into IP addresses

The Domain Name System (DNS) acts like the internet's phonebook. Its primary role is to translate human-readable domain names (like www.example.com) into machine-readable IP addresses (e.g., 192.0.2.1). This translation is essential for your computer to locate and connect to the correct server hosting the website you wish to access.

Question 48: What is a firewall?

An antivirus program
A fire-resistant building component
A security device that monitors and controls network traffic based on rules (Correct answer)
A password manager

Correct answer: A security device that monitors and controls network traffic based on rules

Firewalls filter incoming and outgoing network traffic based on security rules, creating a barrier between trusted and untrusted networks.

Question 49: What does the XOR (exclusive OR) operator return?

TRUE when exactly one input is TRUE (Correct answer)
TRUE when both inputs are TRUE
TRUE when at least one input is TRUE
TRUE when both inputs are FALSE

Correct answer: TRUE when exactly one input is TRUE

XOR returns TRUE only when exactly one of its inputs is TRUE, unlike regular OR which also returns TRUE when both inputs are TRUE.

Question 50: What does the expression NOT(TRUE AND FALSE) evaluate to?

UNDEFINED
TRUE (Correct answer)
FALSE
NULL

Correct answer: TRUE

TRUE AND FALSE = FALSE, then NOT(FALSE) = TRUE.

Question 51: A scatter plot shows points trending upward from left to right. What does this indicate?

A positive correlation between the two variables (Correct answer)
A negative correlation between the two variables
No relationship between the two variables
The data contains many outliers

Correct answer: A positive correlation between the two variables

An upward trend from left to right in a scatter plot indicates a positive correlation — as one variable increases, the other tends to increase as well.

Question 52: A simulation of a financial market includes the rule: 'If a stock rises 5%, 70% of investors sell.' Which real-world phenomenon is this rule attempting to model?

The effect of inflation on stock valuations
Herd behavior, where many investors react similarly to price changes (Correct answer)
Random market fluctuations with no human cause
Government regulation of stock prices

Correct answer: Herd behavior, where many investors react similarly to price changes

The rule models herd behavior — the tendency of many investors to make the same decision in response to market movements.

Question 53: What is the purpose of 'traceroute' (or 'tracert') as a network diagnostic tool?

It scans a network for all connected devices and their open ports
It measures the total bandwidth available on a network connection
It decrypts HTTPS traffic for inspection
It displays the sequence of routers a packet passes through on its way to a destination (Correct answer)

Correct answer: It displays the sequence of routers a packet passes through on its way to a destination

Traceroute reveals each hop (router) a packet takes to reach its destination, along with latency at each hop.

Question 54: Which of the following best describes the difference between IPv4 and IPv6?

IPv6 is slower but more secure than IPv4
IPv6 uses 128-bit addresses, providing far more unique addresses than IPv4's 32-bit addresses (Correct answer)
IPv4 supports wireless networks while IPv6 supports wired networks
IPv6 eliminates the need for DNS

Correct answer: IPv6 uses 128-bit addresses, providing far more unique addresses than IPv4's 32-bit addresses

IPv6 uses 128-bit addresses, allowing approximately 3.4×10³⁸ unique addresses, compared to IPv4's ~4.3 billion addresses.

Question 55: A student shares a copyrighted movie using a peer-to-peer network. Which concept does this BEST relate to?

Network packet loss
Bandwidth allocation
Intellectual property and digital piracy (Correct answer)
DNS resolution failure

Correct answer: Intellectual property and digital piracy

Sharing copyrighted content without authorization constitutes digital piracy and violates intellectual property law.

Question 56: What is the purpose of 'pseudocode' in the design phase?

To run the program without a compiler
To convert the program to machine language
To describe the algorithm logic in plain language before writing actual code (Correct answer)
To encrypt the source code for security

Correct answer: To describe the algorithm logic in plain language before writing actual code

Pseudocode allows developers to plan logic clearly in plain language, making it easier to translate into any programming language.

Question 57: What is a zero-day vulnerability?

A security flaw unknown to the vendor with no available patch (Correct answer)
A vulnerability that was fixed immediately
A low-risk security issue
An outdated software version

Correct answer: A security flaw unknown to the vendor with no available patch

Zero-day vulnerabilities are newly discovered security flaws that the vendor doesn't know about yet, giving them 'zero days' to fix it before potential exploitation.

Question 58: A student sends an email. The message is split into packets that take different routes and arrive out of order. Which protocol reassembles them correctly?

ICMP
UDP
TCP (Correct answer)
IP

Correct answer: TCP

TCP (Transmission Control Protocol) numbers packets and reassembles them in the correct order at the destination.

Question 59: What does 'informed consent' mean in the context of data collection?

Users are clearly told what data is collected and how it will be used, and they agree before collection begins (Correct answer)
Companies can collect any data as long as they store it securely
Informed consent only applies to medical data, not digital data
Users are required to provide their full name when signing up for a service

Correct answer: Users are clearly told what data is collected and how it will be used, and they agree before collection begins

Informed consent requires that users knowingly and voluntarily agree to data collection practices before their information is gathered.

Question 60: A security system uses the condition (door_locked AND alarm_on). What happens to the condition when the door is unlocked?

The alarm_on value determines the outcome
The overall condition becomes FALSE (Correct answer)
The overall condition is still TRUE
The condition becomes undefined

Correct answer: The overall condition becomes FALSE

If door_locked is FALSE, the AND expression is FALSE regardless of the value of alarm_on.

Question 61: Which of the following BEST describes the purpose of data cleaning?

Converting data to a binary format
Compressing data to save storage space
Removing duplicate or incorrect entries to improve data quality (Correct answer)
Encrypting data before transmission

Correct answer: Removing duplicate or incorrect entries to improve data quality

Data cleaning involves identifying and correcting or removing inaccurate, incomplete, or duplicate records to improve dataset quality.

Question 62: Which principle is addressed by laws like the Computer Fraud and Abuse Act (CFAA)?

That all software must be open source
That unauthorized access to computer systems is illegal (Correct answer)
That the government owns all digital data
The right to access any website for free

Correct answer: That unauthorized access to computer systems is illegal

The CFAA makes unauthorized access to computer systems a federal crime, protecting individuals and organizations from hacking.

Question 63: Which of the following is the BEST reason to use version control when creating a computational artifact?

To share the artifact with the public automatically
To track changes and revert to earlier versions if needed (Correct answer)
To make the artifact run faster
To convert code from one language to another

Correct answer: To track changes and revert to earlier versions if needed

Version control systems track changes over time so developers can revert to earlier versions, compare changes, and collaborate without losing work.

Question 64: Which of the following is a concern when combining data from multiple sources into a single dataset?

Multiple sources guarantee higher accuracy
Combining data always violates privacy laws
Inconsistent formats or definitions may create errors (Correct answer)
The combined dataset will always have fewer records

Correct answer: Inconsistent formats or definitions may create errors

When merging datasets from different sources, inconsistent field names, date formats, or value definitions can introduce errors requiring careful data cleaning.

Question 65: Which security practice involves deliberately probing a system for weaknesses before attackers can?

Intrusion detection
Data masking
Access control
Penetration testing (Correct answer)

Correct answer: Penetration testing

Penetration testing (ethical hacking) simulates real attacks to identify and fix vulnerabilities before malicious actors exploit them.

Question 66: Which of the following BEST explains why computing innovations can have unequal societal impacts?

All software contains bugs that affect some users more than others
Faster processors benefit only advanced users
Open protocols always favor large corporations
Existing social inequalities can be amplified when technology access and benefits are unevenly distributed (Correct answer)

Correct answer: Existing social inequalities can be amplified when technology access and benefits are unevenly distributed

Technology often amplifies existing inequalities because those already disadvantaged may lack access to or benefit from new innovations.

Question 67: A student creates an animated story using a presentation tool, adding images, transitions, and recorded narration. This artifact is best classified as:

A database
A hardware component
A multimedia computational artifact (Correct answer)
An algorithm

Correct answer: A multimedia computational artifact

An animated story combining images, transitions, and audio created with a computing tool is a multimedia computational artifact.

Question 68: Why is the internet described as using an 'open standards' approach, and what is one benefit of this?

Open standards require governments to approve all new network protocols
Open standards are publicly documented protocols that any vendor can implement, enabling interoperability between different systems (Correct answer)
Open standards restrict who can build internet infrastructure to prevent monopolies
Open standards mean all internet traffic is publicly visible and unencrypted

Correct answer: Open standards are publicly documented protocols that any vendor can implement, enabling interoperability between different systems

Open standards like TCP/IP are freely available specifications, allowing any device or software from any vendor to interoperate on the internet.

Question 69: When a programmer uses a variable name like `totalScore` instead of a memory address, they are using:

A naming abstraction that hides the physical memory location (Correct answer)
A loop construct
A Boolean expression
A hardware interrupt

Correct answer: A naming abstraction that hides the physical memory location

Variable names are abstractions over physical memory addresses, making code readable and writable.

Question 70: A library provides a function `sortList(list)` that sorts any list. The programmer using the library does not know whether it uses bubble sort or merge sort. This illustrates:

Abstraction — the implementation details are hidden behind an interface (Correct answer)
A syntax error in the library
Binary search being applied to a list
The programmer has no information about the function

Correct answer: Abstraction — the implementation details are hidden behind an interface

The sorting algorithm is hidden behind the function name, which is the essence of abstraction.

AP Computer Science Principles Exam

The AP Computer Science Principles Exam assesses understanding of the computational thinking practices and Big Ideas that form the foundation of the course, including creative development, data, algorithms and programming, computer systems and networks, and the impact of computing.

Questions

120 min

Time Limit

60%

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