UML Diagrams MCQs Questions With Answers – Part 25

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 is the meaning of the <<use>> stereotype in a UML dependency?

A A class inherits from another

B A class temporarily uses another to accomplish a task

C A class is dynamically replaced by another

D A class is extended by another

A <<use>> dependency indicates that the source element depends on the existence or behavior of the target element. This expresses a temporary use, often through a method call or a one-off interaction. Example:

2. What is the purpose of a UML profile diagram?

A To create user profiles for a software

B To model different hardware platforms

C To define an extension of the UML meta-model with stereotypes, constraints, and tags

D To organize use cases into packages

UML profiles allow UML to be extended to a specific domain: avionics, real-time systems, web, security, etc. Stereotypes, tagged values, and domain-specific constraints (OCL) are defined in these profiles.

3. You are developing an e-commerce app. Which diagram represents products, shopping cart, and customer in a static model view?

A Class diagram

B Sequence diagram

C Activity diagram

D State diagram

A class diagram models the static structure of the system and the relationships between entities (products, customer, cart). Example:

A customer can have a cart (optional). A cart can contain multiple products. Each product is defined by its attributes (price, description, etc.).

4. In a UML component diagram, a required interface is represented by:

A An empty circle

B A box containing the word <<interface>>

C A half-moon (socket) pointing outward

D A dashed arrow pointing to an interface

In UML, a required interface is represented by an open socket shape (◠): this means the component is expecting an external implementation of this interface to function. A provided interface is represented by a circle. Example:

5. You are creating a bike rental app. A subscription grants access to multiple rentals. What relationship is this?

A Aggregation

B Association

C Composition

D Dependency

Rentals are dependent on the subscription → if the subscription is removed, the rentals are too. Example:

6. In an educational app, a lesson is made up of several quizzes. These quizzes only make sense in the context of the lesson. What relationship is this?

A Aggregation

B Association

C Dependency

D Composition

The quizzes have no independent existence; they are an integral part of the lesson → composition.

7. In an activity diagram, what does a join node wait for to continue the flow?

A That only one flow arrives

B That a boolean condition is true

C That all incoming flows are completed

D That a system event triggers it

A join node is used to synchronize multiple parallel flows. It waits for all previous activities to complete before continuing to the next step. Example:

8. What does the arrow –> from Server to Client represent?

A A method call

B A response, called return message

C An exception thrown

D A class inheritance

In a sequence diagram, an arrow –> symbolizes the return of information or results, often after processing.

9. You want to model a relationship between Trip and Destination, knowing that a trip must always have at least one destination. What multiplicity would you choose?

A 0..*

B 1..*

C 0..1

D 1..1

Each Trip must have at least one Destination, so it’s 1..*. Example:

10. How do you represent a self-call (method of an object called by itself) in a sequence diagram?

A A loop of arrows returning to the lifeline

B An arrow pointing to another object of the same type

C An arrow going out and coming back on the same lifeline

D A dashed arrow with an X at the end

When an object calls itself (e.g., through an internal method), an arrow is drawn starting from the lifeline and returning to it, usually with an embedded activation rectangle. Example:

This can represent recursion, an internal chain of methods, or autonomous behavior. Commonly used in systems where a component processes its own data or state.

1. What is the meaning of the <<use>> stereotype in a UML dependency?

2. What is the purpose of a UML profile diagram?

3. You are developing an e-commerce app. Which diagram represents products, shopping cart, and customer in a static model view?

4. In a UML component diagram, a required interface is represented by:

5. You are creating a bike rental app. A subscription grants access to multiple rentals. What relationship is this?

6. In an educational app, a lesson is made up of several quizzes. These quizzes only make sense in the context of the lesson. What relationship is this?

7. In an activity diagram, what does a join node wait for to continue the flow?

8. What does the arrow –> from Server to Client represent?

9. You want to model a relationship between Trip and Destination, knowing that a trip must always have at least one destination. What multiplicity would you choose?

10. How do you represent a self-call (method of an object called by itself) in a sequence diagram?

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