Quiz for Design Patterns

Q1: Which of the following is a creational design pattern?

A. Strategy B. Singleton C. Observer D. Decorator

Q2: What is the purpose of the Factory pattern?

A. To encapsulate object creation logic B. To implement recursion C. To handle database connections D. To implement inheritance

Q3: Which pattern ensures that only one instance of a class is created?

A. Builder B. Adapter C. Singleton D. Prototype

Q4: Which design pattern is used to decouple the sender and receiver of a request?

A. Observer B. Command C. Adapter D. Decorator

Q5: Which design pattern provides a simplified interface to a complex subsystem?

A. Decorator B. Facade C. Bridge D. Builder

Q6: Which pattern is used to add new behavior to an object dynamically?

A. Factory B. Prototype C. Decorator D. Mediator

Q7: Which pattern is used to convert one interface to another?

A. Builder B. Adapter C. Proxy D. Factory

Q8: Which design pattern provides a surrogate or placeholder for another object?

A. Adapter B. Proxy C. Composite D. Observer

Q9: Which pattern separates the construction of a complex object from its representation?

A. Builder B. Factory C. Bridge D. Facade

Q10: Which pattern defines a one-to-many dependency between objects?

A. Factory B. Decorator C. Observer D. Prototype

Q11: Which pattern lets subclasses redefine certain steps of an algorithm without changing its structure?

A. Template Method B. Builder C. Strategy D. Command

Q12: Which design pattern encapsulates interchangeable behaviors and uses delegation to decide which behavior to use?

A. Strategy B. Observer C. Factory D. Prototype

Q13: Which design pattern composes objects into tree structures to represent part-whole hierarchies?

A. Composite B. Flyweight C. Decorator D. Adapter

Q14: Which pattern helps avoid creating many instances of the same object?

A. Adapter B. Prototype C. Flyweight D. Singleton

Q15: Which pattern involves cloning an existing object to create a new one?

A. Prototype B. Builder C. Decorator D. Factory

Q16: Which pattern centralizes complex communications and control between related objects?

A. Mediator B. Bridge C. Adapter D. Facade

Q17: Which pattern decouples abstraction from implementation?

A. Builder B. Adapter C. Bridge D. Strategy

Q18: Which pattern provides a way to access the elements of an aggregate object sequentially without exposing its underlying representation?

A. Composite B. Iterator C. Observer D. Factory

Q19: Which pattern allows objects to alter their behavior when their internal state changes?

A. Strategy B. State C. Proxy D. Bridge

Q20: Which pattern provides a high-level interface to a set of interfaces in a subsystem?

A. Proxy B. Builder C. Decorator D. Facade