UML Diagrams MCQs Questions With Answers – Part 7

April 19, 2025 John Howard

Test your knowledge and boost your confidence with these multiple-choice quizzes focused on UML diagrams, foundational software engineering concepts, and real-world best practices. Designed for students, developers, and exam candidates, these MCQs offer a quick and effective way to assess your understanding and sharpen your skills.

1. Which UML notation is used to represent a specific object (and not a class)?

A A rectangle with the name underlined

B An oval

C A circle

D A dotted line

In UML, an object is a class instance. It is represented like a class but with the name underlined, for example :BankAccount.

2. What does the following UML diagram do?

A It shows the class hierarchy

B It illustrates the various actions a client can perform

C It manages state transitions

D It details the messages exchanged between objects

This is a use case diagram, used to represent a system’s functionalities from the user’s perspective.

3. What does the following UML diagram do?

A The content of a class

B The logical flow of a process

C The exchange of messages between objects

D Transitions from one state to another

This is an activity diagram that represents the workflow of a business process: here, a login attempt.

4. What does the following UML diagram do?

A The logical flow of a process

B Visualize use cases

C Show the structure of a class

D Represent the states of an object or process

This is a state diagram, which models the different states an object goes through (e.g., an order or a download).

5. What does the relationship between Animal and Dog represent?

A An association

B A composition

C A generalization (inheritance)

D A dependency

The <|-- symbol indicates that Dog inherits from Animal. Dog is thus a specialization of the Animal class.

6. What is a UML profile?

A A type of UML diagram used for database modeling.

B A mechanism for customizing UML by defining stereotypes, tagged values, and domain-specific constraints.

C A static view of the structure of a software system.

D A textual description of use cases.

UML profiles allow you to tailor the UML language to specific domains (e.g., real-time modeling, embedded systems) by adding extensions to the standard UML metamodel.

7. In a communication diagram (formerly collaboration diagram), how are interactions between objects represented?

A By horizontal arrows representing messages, ordered by time.

B By arrows labeled with sequence numbers indicating the message order.

C By rectangles representing objects and solid lines representing associations.

D By states and transitions triggered by events.

Communication diagrams focus on the structural relationships between objects involved in an interaction, and the order of messages is indicated by sequential numbering. Example:

Objects are represented as in an object diagram. The arrows show messages exchanged between them. The numbering (1, 1.1, 1.2) shows the order of interactions in the scenario.
Here, a customer places an order:

The Client sends a request to an OrderService
The OrderService checks with the Stock
Then, it confirms the order

8. Which type of UML diagram is particularly useful for modeling the behavior of an object through its various states in response to events?

A Use case diagram

B Sequence diagram

C State-transition diagram

D Communication diagram

The state-transition diagram describes the various states an object can take throughout its life cycle and the transitions between these states triggered by events. Example of an order’s life cycle:

An order can be: New, Processing, Shipped, Delivered, or Cancelled.

9. Which of the following is not a UML diagram?

A Class diagram

B Sequence diagram

C Network diagram

D Use case diagram

UML does not include a network diagram. The others (class, sequence, use case) are standard UML diagrams.

10. What is the difference between a class and an object in UML?

A A class is an instance of an object

B An object is a definition of a class

C A class defines the structure, an object is an instance

D No relation between the two

A class describes attributes and behaviors. An object is a concrete instance of that class.

1. Which UML notation is used to represent a specific object (and not a class)?

2. What does the following UML diagram do?

3. What does the following UML diagram do?

4. What does the following UML diagram do?

5. What does the relationship between Animal and Dog represent?

6. What is a UML profile?

7. In a communication diagram (formerly collaboration diagram), how are interactions between objects represented?

8. Which type of UML diagram is particularly useful for modeling the behavior of an object through its various states in response to events?

9. Which of the following is not a UML diagram?

10. What is the difference between a class and an object in UML?

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