True Or False

Question 1 :

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.


A). True
B). False
Answer : Option B

Question 2 :

A ternary relationship is so called because in contains two entities and one association between them.


A). True
B). False
Answer : Option B

Question 3 :

All instances of an entity class have the same attributes.


A). True
B). False
Answer : Option A

Question 4 :

A minimum cardinality is the minimum number of entity instances that may participate in a relationship instance.


A). True
B). False
Answer : Option B

Question 5 :

An attribute describes the entity's characteristics.


A). True
B). False
Answer : Option A

Question 6 :

The degree of a relationship refers to the number of entity classes in the relationship.


A). True
B). False
Answer : Option A

Question 7 :

Entities use identifiers while tables use keys.


A). True
B). False
Answer : Option A

Question 8 :

Composite identifiers consist of two or more attributes.


A). True
B). False
Answer : Option A

Question 9 :

When designing a database, first identify the entities, then determine the attributes, and finally establish the relationships.


A). True
B). False
Answer : Option B

Question 10 :

A subtype entity is a special case of another entity called a supertype entity.


A). True
B). False
Answer : Option A

Question 11 :

An entity is something that can be identified in the user's work environment; something that the users want to track.


A). True
B). False
Answer : Option A

Question 12 :

Entity instances are associated by relationship classes.


A). True
B). False
Answer : Option B

Question 13 :

1:1, 1:N and N:M relationships are also known as HAS-A relationships.


A). True
B). False
Answer : Option A

Question 14 :

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.


A). True
B). False
Answer : Option A

Question 15 :

A maximum cardinality is the maximum number of entity instances that can participate in a relationship instance.


A). True
B). False
Answer : Option A

Question 16 :

An entity class is a collection of entities and is described by the structure of the entities in that class.


A). True
B). False
Answer : Option A

Question 17 :

Relationship classes are associations between entity classes.


A). True
B). False
Answer : Option A

Question 18 :

An identifier typically uses more than one attribute.


A). True
B). False
Answer : Option B

Question 19 :

An identifier determines the type of relationship that an entity has.


A). True
B). False
Answer : Option B

Question 20 :

A recursive relationship is a relationship between an archetype and an instance of that archetype.


A). True
B). False
Answer : Option B