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AP Computer Science Principles Easy practice

15 questions

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Easy practice

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Question 1

Which of the following BEST describes the role of a router on the Internet?

A.A router stores web pages so users can access them faster.B.A router encrypts data before it leaves a device's network interface.C.A router forwards packets from one network to another, choosing the path each packet should take toward its destination.D.A router assigns unique usernames and passwords to each device on the network.

Question 2

A company trains a facial recognition system using a dataset of photographs. The dataset contains mostly photographs of people with lighter skin tones. As a result, the system is significantly less accurate for people with darker skin tones.

This is an example of:

A.A hardware malfunction that prevents the camera from capturing darker skin tones accurately.B.Computing bias caused by a non-representative training dataset.C.Lossy compression that degrades image quality for some users.D.An intentional design decision to reduce the system's scope.

Question 3

A new app allows patients in rural areas to consult with doctors via video call, eliminating the need to travel long distances to a clinic. Which of the following BEST describes this computing innovation?

A.A harmful effect of computing, because it reduces face-to-face interactions between doctors and patients.B.A beneficial effect of computing, because it increases access to healthcare for people in underserved areas.C.Neither beneficial nor harmful, because it only replaces existing in-person visits.D.A harmful effect of computing, because doctors can now see more patients and may provide lower-quality care.

Question 4

Two tasks must be completed: Task A takes 6 minutes and Task B takes 4 minutes. If run sequentially, total time is 10 minutes. If run in parallel on two processors, what is the minimum possible time to complete BOTH tasks?

A.2 minutesB.5 minutesC.6 minutesD.10 minutes

Question 5

How many different values can be represented using 3 bits?

A.3B.6C.8D.16

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Question 6

A developer releases version 1.0 of an app, collects user feedback revealing that the search feature is confusing, and redesigns the search interface for version 2.0. This cycle BEST reflects which principle of program development?

A.Sequential development — completing each phase fully before moving to the next.B.Iterative development — using feedback from each version to improve the next.C.Parallel development — having multiple teams write independent versions simultaneously.D.Abstraction — hiding the complexity of the search algorithm from users.

Question 7

The Internet was designed so that if one path between two computers is unavailable, data can still reach its destination by taking a different path. This property is called:

A.EncryptionB.AbstractionC.Fault toleranceD.Scalability

Question 8

Which of the following BEST distinguishes lossy compression from lossless compression?

A.Lossy compression always produces a smaller file than lossless compression for any type of data.B.Lossless compression allows the original data to be perfectly reconstructed; lossy compression discards some information permanently and cannot perfectly reconstruct the original.C.Lossy compression is used only for text files; lossless compression is used only for images.D.Both lossy and lossless compression permanently remove data to reduce file size.

Question 9

On the Internet, data is sent as small units called packets. Which of the following BEST describes why packets are used instead of sending the entire message as one continuous stream?

A.Packets allow data to travel at faster-than-light speeds through fiber optic cables.B.Packets allow multiple messages to share network paths, enable rerouting around failures, and permit out-of-order delivery that can be reassembled at the destination.C.Packets encrypt the data so it cannot be read while in transit.D.Packets are used only for audio and video streaming; text is still sent as a continuous stream.

Question 10

A citizen science project asks volunteers worldwide to classify galaxy shapes in telescope photographs by viewing images on a website. Thousands of volunteers each classify a few images, producing a large labeled dataset researchers could not create alone.

This is an example of:

A.Phishing — deceiving volunteers into revealing personal information.B.Crowdsourcing — distributing a task across many people to accomplish something impractical for one person or team.C.Parallel computing — running the same algorithm on multiple processors simultaneously.D.Open source software — publishing code so anyone can view and contribute to it.

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Question 11

What is the decimal value of the 8-bit binary number 00001011?

A.8B.11C.13D.3

Question 12

Which of the following BEST describes the concept of open protocols on the Internet?

A.Open protocols mean the Internet has no security and anyone can read all data transmitted.B.Open protocols are publicly documented standards that allow any device or software from any manufacturer to communicate on the Internet.C.Open protocols are owned by a single company that licenses them to other manufacturers.D.Open protocols require all devices to use the same operating system to ensure compatibility.

Question 13

A university uses a single server to host its website. As enrollment grows, the website becomes slow for users. The IT department adds two more identical servers and distributes incoming web requests evenly among all three.

This approach BEST demonstrates which computing concept?

A.Sequential computing — the three servers process one request at a time in order.B.Distributed computing — workload is spread across multiple servers to improve performance and scalability.C.Fault tolerance — the extra servers ensure the site never goes down.D.Encryption — data is split across three servers so no single server has the complete message.

Question 14

Which of the following BEST describes what TCP (Transmission Control Protocol) adds to the basic packet-delivery service of IP?

A.TCP encrypts each packet so that only the intended recipient can read it.B.TCP guarantees reliable, ordered delivery — it detects lost packets and requests retransmission, and reassembles data in the correct order.C.TCP assigns an IP address to each device on the network.D.TCP determines which physical path packets take through the network.

Question 15

What is displayed when the following pseudocode runs?

a ← 10
IF a MOD 3 = 0
{
   DISPLAY "divisible"
}
ELSE
{
   DISPLAY "not divisible"
}

A.divisibleB.not divisibleC.1D.Nothing is displayed.

AP Computer Science Principles Easy practice — Free with Answer Explanations | Test Practice Hub