Design Patterns & SOLID Principles for YP

1. What does the 'S' in SOLID principles stand for?

• a) Scalability Principle
• b) Single Responsibility Principle
• c) Separation Principle
• d) Substitution Principle
• None of these

2. Which SOLID principle is violated in the following code? java class User { public void saveToDatabase() { ... } public void sendEmail() { ... } public void validateInput() { ... }}

• a) Open/Closed Principle
• b) Liskov Substitution Principle
• c) Single Responsibility Principle
• d) Dependency Inversion Principle
• None of these

3. The Open/Closed Principle states that classes should be:

• a) Open for modification, closed for extension
• b) Open for extension, closed for modification
• c) Open for both modification and extension
• d) Closed for both modification and extension
• None of these

4. Which principle ensures that derived classes can replace their base classes without breaking functionality?

• a) Single Responsibility Principle
• b) Open/Closed Principle
• c) Liskov Substitution Principle
• d) Interface Segregation Principle
• None of these

5. The Interface Segregation Principle suggests:

• a) Using one large interface for all methods
• b) Clients should not depend on interfaces they don't use
• c) Interfaces should be implemented by multiple classes
• d) Interfaces should contain only abstract methods
• None of these

6. Which principle is demonstrated by injecting dependencies rather than creating them inside a class?

• a) Single Responsibility Principle
• b) Dependency Inversion Principle
• c) Interface Segregation Principle
• d) Open/Closed Principle
• None of these

7. Which SOLID principle is violated when a subclass throws an exception that the parent class doesn't throw?

• a) Single Responsibility Principle
• b) Open/Closed Principle
• c) Liskov Substitution Principle
• d) Interface Segregation Principle
• None of these

8. The Dependency Inversion Principle states that:

• a) High-level modules should depend on low-level modules
• b) Low-level modules should depend on high-level modules
• c) Both should depend on abstractions
• d) Dependencies should be avoided
• None of these

9. Which approach best follows the Open/Closed Principle for adding new functionality?

• a) Modifying existing classes directly
• b) Using inheritance and polymorphism
• c) Adding new methods to existing interfaces
• d) Creating new classes without any structure
• None of these

10. A class that handles user authentication, database operations, and email sending violates which principle?

• a) Open/Closed Principle
• b) Liskov Substitution Principle
• c) Single Responsibility Principle
• d) Interface Segregation Principle
• None of these