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Quiz 1
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Q.1
Entities of a given type are grouped into a(n):
database.
entity class.
attribute.
ERD.
Q.2
Which of the following is NOT a basic element of all versions of the E-R model?
Entities
Attributes
Relationships
Primary keys
Q.3
Which of the following indicates the minimum number of entities that must be involved in a relationship?
Minimum cardinality
Maximum cardinality
ERD
Greater Entity Count (GEC)
Q.4
An entity is something that can be identified in the user's work environment; something that the users want to track.
True
False
Q.5
Entity instances are associated by relationship classes.
True
False
Q.6
1:1, 1:N and N:M relationships are also known as HAS-A relationships.
True
False
Q.7
In a 1:N relationship, the parent is the entity on the one side of the relationship and the child is the entity on the N side of the relationship.
True
False
Q.8
A maximum cardinality is the maximum number of entity instances that can participate in a relationship instance.
True
False
Q.9
An entity class is a collection of entities and is described by the structure of the entities in that class.
True
False
Q.10
Relationship classes are associations between entity classes.
True
False
Q.11
An identifier typically uses more than one attribute.
True
False
Q.12
An identifier determines the type of relationship that an entity has.
True
False
Q.13
A recursive relationship is a relationship between an archetype and an instance of that archetype.
True
False
Q.14
An ID-dependent entity is an entity whose identifier is a composite identifier where no portion of the composite identifier is an identifier of another entity.
True
False
Q.15
A ternary relationship is so called because in contains two entities and one association between them.
True
False
Q.16
All instances of an entity class have the same attributes.
True
False
Q.17
The degree of a relationship refers to the number of entity classes in the relationship.
True
False
Q.18
Entities use identifiers while tables use keys.
True
False
Q.19
Composite identifiers consist of two or more attributes.
True
False
Q.20
A minimum cardinality is the minimum number of entity instances that may participate in a relationship instance.
True
False
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