AP Computer Science Practice Test (Questions Answers)

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?

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.

What is true about high-level programming languages?
I. High-level languages are easier to debug and easier to code than machine code.
II. High-level languages contain the most abstractions.
III. High-level languages are translated to machine code when executed on a computer.

Hardware is built using multiple levels of abstractions. A computer is an abstraction. By making a computer an abstraction, it hides the complexity of the computer components, allowing the programmer to focus on programming

Which of the following lists hardware in order from high- to low-level hardware abstraction?

Which of the following examples LEAST likely indicates a phishing attack?

With the lowering of the digital divide and more products using the internet, the world is running out of IP addresses. The current plan is to switch from IPv4, which holds 32 bits, to IPv6, which holds 128 bits. With the increase from 32 bits to 128 bits, what is the resulting increase in possible IP addresses?

96²

To get their AP scores hours earlier, if not days earlier, than the scheduled release time, students will hide their IP address so they appear to be in a different time zone. What device can students use to hide their IP address?

One reason to use a hexadecimal number is because it takes up less space than the binary representation. Each hexadecimal digit can represent four binary numbers

Convert A7_HEX to binary.

A computer can use 6 bits to store non-negative numbers. Which of the following will NOT give an overflow error?

I. 64
II. 63
III. 54
IV. 89

Two computers calculate the same equation:
a ← 1/3

A second computer calculates
b ← 1/3

If (a ≠ b), what error has occurred?

What is displayed after executing the algorithm in the flowchart?

What does the above algorithm display?

What error is displayed by the algorithm below?
a ← 8
b ← 5
c ← b – 3
d ← c – 2
DISPLAY(a)
DISPLAY(5/d)

Which of the following is NOT true when executing an algorithm?

The following code segment is intended to swap the values of the variables Marshmallow and Chocolate. What can replace to complete the swapping of Marshmallow and Chocolate?

Marshmallow ← 3

Chocolate ← 15

GrahamCracker ← Marshmallow

Marshmallow ← Chocolate
<Missing Code>

The following question uses two robots in two grids of squares. The robots are represented by triangles pointing in their direction of movement.

When the robot on the left moves over a light gray square, it sends a message to the robot on the right, causing that robot to move forward.

Which of the following code segments will cause the robot on the right to reach the dark gray square?

Constants are variables that are initialized at the beginning of a program and never change. Which of the following are good uses for a constant?

I. To represent the maximum number of people that are safely allowed into a movie theater
II. The score of a ongoing football game
III. The value of pi

What allows users to refer to websites by names, such as hamsterdance.com, instead of IP addresses?

What is the minimum number of bytes needed to store the number 240?

At one of the lowest levels of abstraction, digital data is represented in binary that is a combination of digital zeros and ones.

The number “1001001” in binary is equivalent to what number when converted to base 10?

Using a binary search, how many iterations would it take to find the letter w?
str ← [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z]

Using a linear search, how many iterations would it take to find the letter x?
str ← [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z]

Which of the following statements could be used to describe the role of the Internet Engineering Task Force (IETF)?

I. Prevents copyrighted material from being illegally distributed
II. Develops standards and protocols for internet communication
III. Prevents malware from being distributed

Sequencing, selection, and iteration are building blocks of algorithms. Which of the following is considered selection?

If your algorithm needs to search through a list of unsorted words, what type of search would you use?

The code segment below is a test program intended to diagnose the disease held by a young child based on a user’s entry of fatigue_present and has_cough.

IF fatigue_present AND has_cough
DISPLAY “Flu”
IF has_cough
DISPLAY “Cold”
DISPLAY “Healthy”

If all variables have the value true, what is displayed as a result of running the segments as shown?

Which of the following trade-offs is TRUE when representing information as digital data?

I. There are trade-offs in using lossy and lossless compression techniques for storage and transmitting data.
II. Reading data and updating data have different storage requirements.
III. Lossy data compression reduces the number of bits stored or transmitted at the cost of being able to reconstruct only an approximation of the original.

Colors can be represented by a hexadecimal number. It is made up of three two-digit hexadecimal numbers representing the red, green, and blue components. For example, a color with Red 1, Green 2, and Blue 3 would have the hexadecimal code #010203. Which of the following is the hexadecimal code for a color with Red 160, Green 80, and Blue 60?

This is a web of devices connected through the fault-tolerant redundant internet.

What is the minimum number of other devices that device C must connect with to communicate with E?

This is a web of devices connected through the internet

What is the minimum number of connections that must be broken or removed in the network so that computer G can no longer communicate with computer A?

The following code segment is intended to create list3, which is initially empty. The algorithm uses an abstraction, isFound(list, number), which returns true if the number is found in the list. What is displayed after running the following algorithm?

What is displayed after running the following algorithm?

What is displayed after running the following algorithm?

What is displayed after running the following algorithm?

A smartphone stores the following data for each picture taken using the phone.
The location where the photo was taken
The number of photos taken
The date and time the photo was taken
The filename of the photo
Which of the following can be determined using the metadata described above?
I. How many photos were taken at Disney World
II. The name of the person who took the most recent photo
III. Whether people tend to take more photos on the weekend than during the week