Design Patterns Online Quiz

Q 1 - Which of the following is correct about Singleton design pattern.

A - This type of design pattern comes under creational pattern.

B - This pattern involves a single class which is responsible to create an object while making sure that only single object gets created.

C - Singleton class provides a way to access its only object which can be accessed directly without need to instantiate the object of the class.

D - All of the above.

Q 2 - Which of the following describes the Bridge pattern correctly?

A - This pattern builds a complex object using simple objects and using a step by step approach.

B - This pattern refers to creating duplicate object while keeping performance in mind.

C - This pattern is used when creation of object directly is costly.

D - This pattern is used when we need to decouple an abstraction from its implementation so that the two can vary independently.

Q 3 - Which of the following describes the Composite pattern correctly?

A - This pattern builds a complex object using simple objects and using a step by step approach.

B - This pattern is used where we need to treat a group of objects in similar way as a single object.

C - This pattern hides the complexities of the system and provides an interface to the client using which the client can access the system.

D - This pattern is primarily used to reduce the number of objects created and to decrease memory footprint and increase performance.

Q 4 - Which of the following describes the Proxy pattern correctly?

A - In this pattern a class represents functionality of another class.

B - This pattern creates a chain of receiver objects for a request.

C - This pattern provides a way to evaluate language grammar or expression.

D - In this pattern a request is wrapped under an object as command and passed to invoker object.

Q 5 - Which of the following pattern is used to get a way to access the elements of a collection object in sequential manner without any need to know its underlying representation?

A - Iterator Pattern

B - Mediator Pattern

C - Memento Pattern

D - Observer Pattern

Q 6 - Which of the following describes the MVC pattern correctly?

A - In this pattern, a visitor class is used which changes the executing algorithm of an element class.

B - This pattern is used to separate application's concerns.

C - This pattern is used to decouple presentation tier and business tier.

D - This pattern is used in EJB persistence mechanism.

Q 7 - In which of the following pattern, a visitor class is used which changes the executing algorithm of an element class?

A - Visitor Pattern

B - MVC Pattern

C - Business Delegate Pattern

D - Composite Entity Pattern

Q 8 - Which of the following describes the Factory pattern correctly?

A - This pattern creates object without exposing the creation logic to the client and refer to newly created object using a common interface.

B - In this pattern an interface is responsible for creating a factory of related objects without explicitly specifying their classes.

C - This pattern involves a single class which is responsible to create an object while making sure that only single object gets created.

D - This pattern is used when we want to pass data with multiple attributes in one shot from client to server.

Q 9 - Which of the following pattern is used when we want to pass data with multiple attributes in one shot from client to server?

A - Factory Pattern

B - Abstract Factory Pattern

C - Singleton Pattern

D - Transfer Object Pattern

Q 10 - Which of the following is the correct list of entities of Service Locator pattern?

A - Service, Context, Cache, Client

B - Service, Context, Service Locator, Cache, Client

C - Service, Context, Service Locator, Cache, Client

D - Service, Service Locator, Client