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SOLID Principles Online Test

The Solid Principles Test uses scenario-based multiple choice questions to evaluate candidates on their understanding of the SOLID design principles for object-oriented software development. The test assesses candidates' proficiency in applying SOLID principles to write maintainable, extensible, and testable code, including topics such as single responsibility principle (SRP), open-closed principle (OCP), Liskov substitution principle (LSP), interface segregation principle (ISP), dependency inversion principle (DIP), and the SOLID design patterns.

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Screen candidates with a 25 mins test

Test duration:  25 mins
Difficulty level:  Moderate
Availability:  Ready to use
  • 10 SOLID MCQs
Covered skills:
Open Closed Principle (OCP)
Interface Segregation Principle (ISP)
Dependency Inversion Principle (DIP)
Single Responsibility Principle (SRP)
Liskov Substitution Principle (LSP)
Inversion of Control
Violation in SRP
Cohesion and Encapsulation
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Use the SOLID Principles Test to shortlist qualified candidates

The SOLID Principles Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Understanding and applying the Open Closed Principle (OCP)
  • Implementing interfaces to adhere to the Interface Segregation Principle (ISP)
  • Applying the Dependency Inversion Principle (DIP) to decouple components
  • Designing classes and modules with a single responsibility, following the Single Responsibility Principle (SRP)
  • Ensuring proper inheritance and substitutability with the Liskov Substitution Principle (LSP)
  • Utilizing Inversion of Control (IoC) containers for managing object dependencies
  • Identifying and resolving violations of the Single Responsibility Principle (SRP)
  • Ensuring high cohesion and encapsulation in code design
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Screen candidates with the highest quality questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this SOLID Principles Test will be non-googleable.

🧐 Question


Paint says Bye!
Which SOLID principle is followed by the given code snippet?
🧐 Question🔧 Skill


Paint says Bye!

2 mins

🧐 Question🔧 Skill💪 Difficulty⌛ Time
Paint says Bye!
Easy2 mins

Test candidates on core SOLID Principles Hiring Test topics

Open Closed Principle (OCP): The Open Closed Principle (OCP) states that software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification. This means that new functionality can be added without changing the existing code, making the software more maintainable and robust.

Interface Segregation Principle (ISP): The Interface Segregation Principle (ISP) states that clients should not be forced to depend on interfaces they do not use. By creating smaller, cohesive interfaces, this principle helps to prevent a class from implementing unnecessary methods, reducing complexity and improving code readability.

Dependency Inversion Principle (DIP): The Dependency Inversion Principle (DIP) states that high-level modules should not depend on low-level modules. Instead, both should depend on abstractions. By using interfaces or abstract classes to define the dependencies, this principle promotes loose coupling, making the code more flexible, testable, and easier to maintain.

Single Responsibility Principle (SRP): The Single Responsibility Principle (SRP) states that a class should have only one reason to change. By separating concerns and assigning each class a single responsibility, this principle improves code organization, readability, and maintainability.

Liskov Substitution Principle (LSP): The Liskov Substitution Principle (LSP) states that objects of a superclass should be replaceable with objects of its subclasses, without affecting the correctness of the program. This principle ensures that inheritance is used correctly, avoiding unexpected behavior and allowing the code to be extended without breaking existing functionality.

Inversion of Control: Inversion of Control (IoC) is a design principle that refers to the external control of an object's lifecycle, rather than the object itself managing its dependencies and resources. This principle enables loose coupling, promotes modularity, and simplifies testing and maintenance.

Violation in SRP: A violation of the Single Responsibility Principle (SRP) occurs when a class has multiple responsibilities, making it difficult to understand, maintain, and reuse. This measurement helps identify classes that may require refactoring to adhere to the principle, improving code quality and reducing complexity.

Cohesion and Encapsulation: Cohesion refers to the degree to which the elements of a module or class are related to each other. Encapsulation refers to the bundling of related data and behavior into a single entity, such as a class. Measuring cohesion and encapsulation helps assess the design and organization of the code, ensuring high cohesion and strong encapsulation for better maintainability and extensibility.

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Have questions about the SOLID Principles Hiring Test?

How does pricing work?

You can check out our pricing plans.

Can I customize the test?

Yes, absolutely. Custom assessments are set up within 48 hours based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test. You can also customize a test by uploading your own questions.

Can I combine multiple skills into one test?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

What roles can I use the SOLID Principles Test for?

Here are few roles for which we recommend this test:

  • Software Developer
  • Software Engineer
  • Full Stack Developer
  • Front-end Developer
  • Back-end Developer
Can I see a sample test, or do you have a free trial?


The free trial includes one sample technical test (Java/ JavaScript) and one sample aptitude test that you will find in your dashboard when you sign up. You can use it to review the quality of questions and the candidate experience of giving a test on Adaface.

You can preview any of the 500+ tests and see the sample questions to decide if it would be a good fit for your requirements.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

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