UML Diagrams MCQs Questions With Answers – Part 23

April 20, 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 <<include>> mean here?

A The command is optional

B The client can order without authenticating

C The “Order” case requires authentication

D “Authenticate” is a possible extension

<> means that one use case is always included in another. Here, for “Place Order,” “Authenticate” is required.

2. Which UML fragment represents a conditional repetition (equivalent to a while loop)?

A alt

B opt

C par

D loop

The loop fragment is used to indicate that the messages inside are repeated as long as a condition is true. You can specify the min/max bound or a loop condition. Example:

3. What is the standard UML symbol for implementing an interface in a class diagram?

A A solid arrow with a closed tip

B A dashed arrow with an open tip

C A solid line with no arrow

D An association with multiplicity 1..*

When a class implements an interface, UML connects it with a dashed line and an open arrow pointing to the interface. If a class inherits from another, it’s a solid line with a closed arrow. Example:

4. What does the <<include>> relationship mean in a use case diagram?

A An optional feature

B A secondary use case extended from a primary one

C A use case called systematically by another

D A dependency between two classes

The <<include>> relationship allows extracting a common part from several use cases. It is always executed when the main case is triggered. It’s functional factoring.

5. You are creating a cooking app. What relationship models the link between a recipe and its steps (which only exist within the recipe)?

A Aggregation

B Dependency

C Composition

D Association

The steps are an integral part of the recipe → they cannot exist on their own → composition. Example:

6. Which UML diagram is best suited to describe the modular organization (packages, dependencies) of a software system?

A Sequence diagram

B Activity diagram

C Class diagram

D Package diagram

The package diagram shows the logical organization of the model in groups. It helps structure a large system and represent dependencies between packages (imports, usage…). Example:

7. You want to illustrate the scenario: “A student registers for a course, then receives a confirmation.” Which diagram would you use?

A Communication diagram

B Deployment diagram

C Sequence diagram

D Activity diagram

It shows the exchange of messages in temporal order → perfect for a registration. Example:

8. In UML, how is a generic class (template/generics) represented?

A With stereotypes

B With an abstract class

C With parameters placed between << >>

D With a box containing the parameter name between angle brackets < >

Generic classes in UML are indicated by a type parameter in a box at the top right of the class, for example: List<T> where T is a type parameter. Example:

9. Among the following diagrams, which one is not part of UML’s behavioral diagrams?

A Activity diagram

B State diagram

C Class diagram

D Use case diagram

The class diagram is a structural diagram, not a behavioral one. Behavioral diagrams describe how the system behaves or interacts, such as: use cases, activities, states, sequences…

10. What does <<extend>> mean here?

A The “Share” case is always executed

B “Share” is an option that can be activated on demand

C “Share” is the main case

D “Share” replaces “Consult”

<<extend>> allows adding optional behavior. Here, after consulting an article, the user can (or not) share it.

1. What does <<include>> mean here?

2. Which UML fragment represents a conditional repetition (equivalent to a while loop)?

3. What is the standard UML symbol for implementing an interface in a class diagram?

4. What does the <<include>> relationship mean in a use case diagram?

5. You are creating a cooking app. What relationship models the link between a recipe and its steps (which only exist within the recipe)?

6. Which UML diagram is best suited to describe the modular organization (packages, dependencies) of a software system?

7. You want to illustrate the scenario: “A student registers for a course, then receives a confirmation.” Which diagram would you use?

8. In UML, how is a generic class (template/generics) represented?

9. Among the following diagrams, which one is not part of UML’s behavioral diagrams?

10. What does <<extend>> mean here?

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