Data Modeling with ER Model – General Questions

16. In which of the following is a single-entity instance of one type of related to a single-entity instance of another type?

A. One-to-One Relationship
B. One-to-Many Relationship
C. Many-to-Many Relationship
D. Composite Relationship

Correct Answer:  A. One-to-One Relationship

17. Entities can be associated with one another in which of the following?

A. Entities
B. Attributes
C. Identifiers
D. Relationships

Correct Answer:  D. Relationships

18. Which type of entity has its relationship to another entity determined by an attribute in that other entity called a discriminator?

A. Supertype entity
B. Subtype entity
C. Archetype entity
D. Instance entity

Correct Answer:  B. Subtype entity

19. Which type of entity represents a logical generalization whose actual occurrence is represented by a second, associated entity?

A. Supertype entity
B. Subtype entity
C. Archetype entity
D. Instance entity

Correct Answer:  C. Archetype entity

20. In a one-to-many relationship, the entity that is on the many side of the relationship is called a(n) ________ entity.

A. parent
B. child
C. instance
D. subtype

Correct Answer:  B. child

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