UML Diagrams MCQs Questions With Answers – Part 26

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 role of an artifact in a UML deployment diagram?

A Represent a system process

B Describe a user activity

C Represent a file or physical element deployed on a node

D Identify a dependency between classes

C

An artifact corresponds to a concrete system element, such as an executable, a JAR file, a database, etc. It is deployed on a node (machine, server…) and is often linked to a software component. Example:
 

This application has several artifacts:

• A source code (.jar)
• A database
• A technical document PDF

2. In a carpooling app, a car can be used by several trips. Trips can exist without the car. What relationship is this?

A Composition

B Association

C Dependency

D Aggregation

D

The trips doesn’t disappear if the car is deleted → this is an aggregation. Example:
 

3. What does this relationship represent?

B An Employee inherits from another

C An Employee contains another Employee

D This represents a recursive composition

4. You want to represent a conditional choice in an activity diagram (e.g., “if payment is validated, send confirmation, otherwise cancel”). Which symbol should you use?

A Diamond

B Rectangle

C Circle

D Horizontal line

A

The diamond is used to represent a decision point (if / else). Example:
 

5. In UML, a composite state contains ______________

A An activity diagram

B One or more class transitions

C Other internal states

D A conditional structure

C

A composite state is a state that contains other states (called sub-states), allowing for hierarchical behavior modeling. It can have a local initial state, internal transitions, etc. Example:
 

This diagram could model a music application:

• The global state “MusicPlayback” contains internal steps: Loading, Playing, Paused
• Externally, you can go back to the “Paused” state

6. What is the purpose of packages here?

B To organize the code based on the visibility of attributes

C To group classes by functionality or domain

D To separate objects and classes

7. In a UML object diagram, how do you indicate an object’s attribute value?

A In brackets [ ] under the name

B As name:Class without further indication

C By listing attribute = value pairs inside the rectangle

D By coloring them in blue

client1 : Client
name = Dupont
status = active

8. In a use case diagram, what does a generalization relationship between two cases mean?

A The specialized case is always called

B The specialized case inherits the behavior of the general case

C The general case depends on the child case

D The main actor changes dynamically

B

Just like with classes, a use case can inherit from another: this allows you to specialize a general scenario with specific variations while reusing the common steps. Example:
 

“Pay by card” and “Pay via PayPal”: these are specializations of the generic “Make payment” action.

9. Which UML rule is illustrated here?

B A class can only implement an interface if it is abstract

C UML allows multiple inheritance of interfaces

D Interfaces must be in composition

10. In UML, what does a <<realize>> dependency between two elements mean?

A An abstract class becomes concrete

B An interface is implemented by a class

C An activity is executed automatically

D A component inherits from another

MCQPractice competitive and technical Multiple Choice Questions and Answers (MCQs) with simple and logical explanations to prepare for tests and interviews.Read More