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100+ Free ILTS Computer Science (205) Practice Questions

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In object-oriented design, a constructor is a special method used primarily to do which of the following?

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B
C
D
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2026 Statistics

Key Facts: ILTS Computer Science (205) Exam

240

Passing Scaled Score

ILTS Computer Science (205) test page

$110

Test Fee (2026)

ILTS Computer Science (205) test page

100 MC

Test Format

ILTS Computer Science (205) test page

3 hr 15 min

Testing Time

ILTS Computer Science (205) test page

4 subareas

Content Domains

ILTS Computer Science (205) study guide

40%

Computer Programming Weight

ILTS Computer Science (205) study guide

70%

Programming + Computational Thinking

ILTS Computer Science (205) study guide

100-300

Score Scale

ILTS score reporting

ILTS Computer Science (205) is Illinois's computer science content licensure test, administered by Pearson Evaluation Systems for the Illinois State Board of Education as a computer-based exam with 100 multiple-choice questions and a passing scaled score of 240. The four subareas are weighted Computational Thinking 30%, Computer Programming 40%, The Internet 10%, and Impacts of Computing and Learning Environments 20%, so programming and computational thinking together make up 70% of the test. The current public registration fee is $110 and the appointment runs 3 hours 30 minutes, including 3 hours 15 minutes of testing. This free 100-question bank mirrors the official subarea weighting so candidates can practice across every subarea.

Sample ILTS Computer Science (205) Practice Questions

Try these sample questions to test your ILTS Computer Science (205) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A teacher wants students to break a large, complex programming task into smaller, more manageable pieces that can be solved independently. Which computational thinking concept best describes this strategy?
A.Decomposition
B.Pattern recognition
C.Abstraction
D.Algorithm design
Explanation: Decomposition is the computational thinking practice of breaking a complex problem into smaller, more manageable subproblems that can each be solved separately and then recombined. It is a foundational step in the problem-solving process emphasized in CS education.
2In computational thinking, what does abstraction primarily allow a programmer to do?
A.Hide unnecessary detail and focus on the essential features of a problem
B.Execute instructions in parallel across multiple processors
C.Guarantee that a program runs in constant time
D.Convert source code directly into machine language
Explanation: Abstraction is the process of filtering out irrelevant details so a programmer can concentrate on the essential properties and behavior of a system. It enables building general, reusable models and is central to managing complexity in software design.
3A student notices that several different sorting problems all share the same underlying step of comparing two adjacent values and swapping them when out of order. Recognizing this shared structure across problems is an example of which computational thinking practice?
A.Pattern recognition
B.Decomposition
C.Encapsulation
D.Iteration
Explanation: Pattern recognition is the practice of identifying similarities, trends, or repeated structures across problems so solutions can be generalized. Noticing that a compare-and-swap step recurs across sorting problems is a classic example.
4Which sequence best represents a general problem-solving process for designing a computational solution?
A.Define the problem, plan and design a solution, implement, then test and refine
B.Implement code, then define the problem, then test
C.Test the program, then design it, then define the problem
D.Design the user interface, then define the problem, then plan
Explanation: A sound problem-solving process first defines and understands the problem, then plans and designs a solution (often with algorithms), implements it, and finally tests and refines based on results. Defining the problem before designing and coding prevents wasted effort.
5An algorithm is best defined as which of the following?
A.A finite, well-defined sequence of steps for solving a problem or completing a task
B.A high-level programming language used for web development
C.A physical component that stores program instructions
D.A diagram that shows how classes inherit from one another
Explanation: An algorithm is a finite, unambiguous, ordered sequence of steps that solves a problem or accomplishes a task. Algorithms are language-independent and can be expressed in pseudocode, flowcharts, or any programming language.
6Consider the following pseudocode: set total to 0 for each number in list add number to total output total Which algorithmic control structure does the 'for each' line represent?
A.Iteration
B.Selection
C.Recursion
D.Sequence only
Explanation: A 'for each' loop repeats a block of steps once for every element in a collection, which is iteration (repetition). Iteration is one of the three fundamental control structures along with sequence and selection.
7A recursive function must include which of the following to avoid infinite recursion?
A.A base case that stops the recursive calls
B.A global variable shared across all calls
C.At least two parameters
D.A loop inside the function body
Explanation: Every correct recursive function needs a base case: a condition under which it returns a value without making another recursive call. Without a base case, the function would call itself indefinitely and eventually exhaust the call stack.
8Which of the following describes a conditional (selection) structure in an algorithm?
A.The program chooses among different actions based on whether a condition is true or false
B.The program repeats a block of steps a fixed number of times
C.The program executes statements one after another in a single fixed order
D.The program calls itself with a smaller input
Explanation: A conditional, or selection, structure (such as if, if-else, or switch) evaluates a Boolean condition and chooses which block of code to run based on the result. This branching is what distinguishes selection from sequence and iteration.
9A flowchart uses a diamond shape to represent which element of an algorithm?
A.A decision or condition
B.A process or computation step
C.Input or output
D.The start or end of the program
Explanation: In standard flowchart notation, a diamond represents a decision point where a yes/no or true/false condition determines which branch the flow follows. Decisions correspond to selection structures in code.
10Two algorithms solve the same problem. Algorithm A runs in O(n) time and Algorithm B runs in O(n^2) time. For very large values of n, which statement is most accurate?
A.Algorithm A is generally more efficient because its running time grows linearly rather than quadratically
B.Algorithm B is always faster because it has a higher exponent
C.Both algorithms run in exactly the same time for all inputs
D.Big-O notation describes memory only, not running time
Explanation: Big-O describes how an algorithm's resource use grows with input size. O(n) grows linearly while O(n^2) grows quadratically, so for large n, the linear-time Algorithm A requires far fewer operations and is generally more efficient.

About the ILTS Computer Science (205) Exam

The ILTS Computer Science (205) test is the content-area assessment for the Illinois computer science teaching endorsement. The computer-based test contains 100 multiple-choice questions organized into four subareas: Computational Thinking (30%), Computer Programming (40%), The Internet (10%), and Impacts of Computing and Learning Environments (20%). It measures the knowledge and skills an entry-level computer science educator needs to teach effectively in Illinois public schools.

Questions

100 scored questions

Time Limit

3 hours 15 minutes of testing (3 hours 30 minutes total appointment)

Passing Score

240 scaled score

Exam Fee

$110 (Illinois State Board of Education (ISBE) / Pearson)

ILTS Computer Science (205) Exam Content Outline

30% of this test

Computational Thinking (Subarea 1)

The problem-solving process and its connection to mathematics, including decomposition, abstraction, and pattern recognition; the types and characteristics of algorithms covering sequence, conditionals, iteration, and recursion, expressed in pseudocode and flowcharts; algorithm efficiency and Big-O reasoning; and object-oriented program design including functions, classes and objects, encapsulation, inheritance, and polymorphism.

40% of this test

Computer Programming (Subarea 2)

Characteristics of computational tools such as libraries, IDEs, compilers, interpreters, and digital-artifact creation; data types and data structures including primitives, strings, arrays, stacks, queues, linked lists, and hash tables; program control with operators, Boolean logic, scope, and control structures; and software development and testing including the development life cycle, debugging, version control, input validation, and unit and boundary testing.

10% of this test

The Internet (Subarea 3)

The structure and operations of the Internet, including packet switching, the TCP/IP protocol suite, IP addressing, DNS, and routing; Internet security topics such as encryption, HTTPS, firewalls, authentication, and phishing; and the basics of web design and front-end technologies such as HTML and CSS.

20% of this test

Impacts of Computing and Learning Environments (Subarea 4)

The social and global impact of computing, including digital citizenship, privacy, intellectual property, algorithmic bias, automation, the digital divide, and responsible data stewardship; plus the learning environment and effective teaching and learning strategies in computer science, such as pair programming, scaffolding, project-based learning, unplugged activities, equity, accessibility, and formative assessment.

How to Pass the ILTS Computer Science (205) Exam

What You Need to Know

  • Passing score: 240 scaled score
  • Exam length: 100 questions
  • Time limit: 3 hours 15 minutes of testing (3 hours 30 minutes total appointment)
  • Exam fee: $110

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

ILTS Computer Science (205) Study Tips from Top Performers

1Allocate study time by subarea weight: Computer Programming is the heaviest at 40%, followed by Computational Thinking at 30%
2Practice tracing code and predicting output for loops, conditionals, and recursion, since the programming and computational-thinking sections reward fluency
3Review core data structures (arrays, stacks, queues, linked lists, hash tables) and when each is the best choice
4Strengthen Boolean logic, operator precedence, and short-circuit evaluation, which appear across the program-control objectives
5Study Internet fundamentals such as TCP/IP, DNS, packet switching, and basic cybersecurity (phishing, encryption, firewalls)
6Prepare for pedagogy and impacts items by reviewing digital citizenship, ethics, equity, and effective CS teaching strategies like pair programming and scaffolding

Frequently Asked Questions

What is on the ILTS Computer Science (205) test?

The test covers four subareas: Computational Thinking (30%), Computer Programming (40%), The Internet (10%), and Impacts of Computing and Learning Environments (20%). All content is assessed with multiple-choice questions, with programming and computational thinking together accounting for 70% of the test.

How many questions are on the ILTS Computer Science (205) test and what is the format?

The computer-based test has 100 multiple-choice questions and no constructed-response assignments. Each question offers four answer choices, and your score is based on the number of questions answered correctly.

What is the passing score for ILTS Computer Science (205)?

You need a scaled score of 240 to pass the ILTS Computer Science (205) test. ILTS scores are reported on a scale of 100 to 300, and 240 is the standard passing score used across ILTS tests.

How much does the ILTS Computer Science (205) test cost in 2026?

The current public registration fee for the ILTS Computer Science (205) test is $110. Always confirm the exact amount in your Pearson/ILTS registration account before checkout, since fees can change.

How long is the ILTS Computer Science (205) test appointment?

The total appointment is 3 hours 30 minutes, which includes about 15 minutes for the computer-based testing tutorial and nondisclosure agreement, leaving 3 hours 15 minutes for the actual test. Budget your time across the 100 multiple-choice questions.

Who administers the ILTS Computer Science (205) test?

The Illinois Licensure Testing System (ILTS) is administered by Pearson (Evaluation Systems) on behalf of the Illinois State Board of Education (ISBE). The Computer Science (205) test is required for the Illinois computer science teaching endorsement for grades 5-12.