UML Diagrams MCQs Questions With Answers – Part 32

April 21, 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. What does this arrow –|> indicate?

A A simple dependency

B Inheritance between components

C The component provides the IPaiement interface

D The component contains IPaiement

In a component diagram, a solid arrow toward an interface means the component provides it—i.e., it implements that contract.

2. What mechanism allows adapting a UML model to different contexts using parameters?

A Profiles

B Stereotyped models

C Parameterized models

D Composite structures

A parameterized model is a UML template containing formal parameters (like types or classes), allowing multiple model versions to be created by instantiating them.

3. You’re building a banking app. You want to show that a checking account and a savings account are types of bank accounts. What UML concept applies?

A Generalization

B Association

C Dependency

D Composition

The bank account is a parent class, the others are subclasses → inheritance. Example:

4. In a state diagram, what does an entry action mean?

A An action performed when exiting the state

B An action executed if a guard is true

C An action executed every time the state is entered

D An action triggered only manually

Entry actions are automatically executed when entering a state, useful for initialization, triggering animations, etc.

5. What is the purpose of {invariant total >= 0}?

A To limit the number of orders

B To link two classes

C To indicate a default value

D To define an OCL (Object Constraint Language) constraint on objects

OCL invariants define business logic rules that every instance must comply with.

6. What does this “alt” block with “stock error” represent?

A To model an exception or alternate scenario

B To test attributes

C To perform a loop

D To display a secondary diagram

In a sequence diagram, “alt” can be used for conditional branches, including error or exception handling.

7. What does this state diagram model?

A Two independent states

B Transitions between classes

C An infinite loop

D A composite state containing its own substates

UML allows for nested states, which are useful for complex objects with internal behaviors.

8. What is the role of the word “owns” here?

A It’s a class type

B It’s an attribute name

C It’s an association name describing the role of the relationship

D It’s a method

Naming a relationship improves the diagram’s readability by clarifying the logical link between two classes.

9. What does this structure model?

A A multiple composition

B An n-ary association between several classes

C A generic interface

D A composite state

An n-ary association connects 3 or more classes, typically represented using an intermediate class.

10. What is the purpose of an association class?

A To associate two abstract classes

B To add attributes to a relationship between two classes

C To define a class without attributes

D To represent a multiple aggregation

When a relationship between two classes needs to store its own data (like a start date), it becomes an association class linked to that relationship. Example:

You can’t store things like startDate directly in a simple association, so it’s modeled as a dedicated class connected to both classes.

1. What does this arrow –|> indicate?

2. What mechanism allows adapting a UML model to different contexts using parameters?

3. You’re building a banking app. You want to show that a checking account and a savings account are types of bank accounts. What UML concept applies?

4. In a state diagram, what does an entry action mean?

5. What is the purpose of {invariant total >= 0}?

6. What does this “alt” block with “stock error” represent?

7. What does this state diagram model?

8. What is the role of the word “owns” here?

9. What does this structure model?

10. What is the purpose of an association class?

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