SOLID Principles Interview Questions and Answers: Intermediate to Expert-Level MCQs The SOLID principles are the cornerstone of object-oriented design. They provide a set of guidelines that help developers write code that is more maintainable, scalable, and reusable. While most developers can name the five principles, truly understanding and applying them in complex scenarios is the mark of an expert. Undoubtedly, theory is essential, putting that knowledge to the test is the best way to prepare. This article presents advanced-level Multiple-Choice Questions (MCQs) designed for those who want to go beyond the basics. Each question is crafted to test your deep understanding of single responsibility, open-closed, Liskov substitution, interface segregation, and dependency inversion. We’ve included detailed explanations for every answer, so you