Question 1

Which of the following is a true statement about the current version of UML?
A)UML places a filled-in diamond on the parent of a weak entity.
B)UML does not provide a means to document exclusivity among subtypes.
C)UML uses the label <identifying> to document an ID-dependent relationship.
D)UML shows the cardinality on the parent entity of a weak entity as simple "1."
E)All of the above.

Accepted Answer

E

Question 2

Attributes preceded by a + are public.

Accepted Answer

In Java, attributes preceded by a "+" (plus) sign are public, meaning they can be accessed from any code within or outside of the class.

Question 3

In UML,cardinalities are represented by an x ..y format.

Accepted Answer

This format represents the minimum and maximum number of instances that can exist in a relationship between two classes.

Question 4

Persistent means that data should continue to exist in the database even if the object that processes it is destroyed.

Accepted Answer

Persistent data remains in the database even if the object that processed it no longer exists. This is a key feature of databases and allows for data to be stored and retrieved over time.

Question 5

In UML-style E-R diagrams,the second segment of an entity class contains ________.
A)the name of the entity
B)the cardinalities of the entity
C)constraints and methods
D)relationships
E)entity attributes

Accepted Answer

The second segment of an entity class in UML-style E-R diagrams contains entity attributes.

Question 6

UML is intended for modeling and designing object-oriented programs and applications.

Accepted Answer

UML (Unified Modeling Language) is a modeling language used in software engineering for visualizing, specifying, constructing, and documenting the artifacts of a software system. It is mainly intended for modeling and designing object-oriented programs and applications.

Question 7

Which of the following would indicate a minimum cardinality of 1 and a maximum cardinality of many in UML notation?
A)1:N
B)1 ..N
C)1 / *
D)1 ..*
E)1:*

Accepted Answer

The notation "1 ..*" indicates a minimum cardinality of 1 and a maximum cardinality of many.

Question 8

In UML-style E-R diagrams,the third segment of an entity class contains ________.
A)the name of the entity
B)the cardinalities of the entity
C)constraints and methods
D)relationships
E)entity attributes

Accepted Answer

The answer of In UML-style E-R diagrams,the third segment of...

Question 9

One weakness of UML-style E-R diagrams is that there is no means of distinguishing between a weak entity that is ID-dependent and a weak entity that is not ID-dependent.

Accepted Answer

UML-style E-R diagrams allow for the distinction between weak entities through the use of different notations, such as dashed lines for ID-dependent relationships, indicating the dependency of a weak entity on its parent entity for identification.

Question 10

UML-style E-R diagrams introduce object-oriented notation that is of limited practical value in traditional,relational database design.

Accepted Answer

UML-style E-R diagrams are tailored towards object-oriented design and may not fully capture the complexities and relationships in traditional relational databases. Therefore, their practical value in traditional database design is limited.

Question 11

In UML-style E-R diagrams,a weak entity is shown by placing a filled-in diamond on the parent of the weak entity.

Accepted Answer

In UML-style E-R diagrams, a weak entity is represented by a filled-in rectangle with a single-lined border and a filled-in diamond on the parent entity's side.

Question 12

Attributes preceded by a # are private.

Accepted Answer

Attributes preceded by a # are actually considered as private attributes in Python. However, they can still be accessed using certain techniques such as name mangling.

Question 13

UML-style E-R diagrams allow for three different levels of visibility of attributes.

Accepted Answer

UML-style E-R diagrams allow for three different levels of visibility of attributes: public (+), protected (#), and private (-).

Question 14

The classes of all entities to be stored in the database are labeled <>.

Accepted Answer

Entities that are stored in the database are referred to as "persistent" since they persist beyond the lifetime of the application.

Question 15

In UML notation,the relationship line in a relationship with an ID-dependent weak entity is labeled as <id-dependent>.

Accepted Answer

In UML notation, the relationship line in a relationship with an ID-dependent weak entity is typically not labeled with "". Instead, the relationship is often indicated by a dashed line or a specific notation that denotes the entity's weak status, without explicitly using the text "".

Question 16

Maximum cardinalities are represented in UML-style E-R diagrams with the same notation (1:1,1:N,N:M)as in traditional E-R diagrams.

Accepted Answer

The answer of Maximum cardinalities are represented in UML-style E-R...

Question 17

Attributes preceded by a + are protected.

Accepted Answer

Attributes preceded by a + are considered public, not protected. In UML (Unified Modeling Language), a + indicates public visibility, while # indicates protected visibility.

Question 18

In UML notation,the relationship line in a relationship with a non-ID-dependent weak entity is labeled as <nonidentifying>.

Accepted Answer

This is correct. The relationship line in a relationship with a non-ID-dependent weak entity is labeled as in UML notation. The label indicates that the relationship does not depend on the existence of the weak entity and that the weak entity's existence is dependent on the other entity in the relationship.

Question 19

UML-style E-R diagrams allow for the existence of class attributes which are attributes that pertain to the collection of all entities within that class,not to the individual entity instances themselves.

Accepted Answer

UML-style E-R diagrams do indeed allow for the existence of class attributes that pertain to the collection of all entities within the class.

Question 20

Which of the following is true about UML?
A)UML is a methodology for developing OOP systems.
B)UML is a set of tools to support the development of OOP systems.
C)UML is primarily focused on database development.
D)A and B
E)A,B and C

Accepted Answer

UML (Unified Modeling Language) is not a methodology but a standardized modeling language used to visualize, specify, construct, and document the artifacts of software systems, particularly object-oriented ones. It provides a set of tools and diagrams to support the development of OOP systems. It is not primarily focused on database development.

Quiz 19: E-R Diagrams and the UML Standard

Which of the following is a true statement about the current version of UML?