Unit 4 Lesson 2B Quiz FINALS BSIT 2A(Irreg)

Who developed the entity-relationship modeling and published his work in 1976?

• Peter Chen

• E.F. Codd

• Alan Turing

• Bill Gates

What shape represents an entity in Chen ERD notation?

• Circle

• Oval

• Rectangle

• Diamond

What is a weak entity?

• An entity that is always optional

• An entity that can be uniquely identified by its attributes

• An entity that has no relationships

• An entity that cannot be uniquely identified by its attributes alone

How is a key attribute represented in Chen notation?

• With a double rhombus

• With an underscored name

• With an oval

• With a dashed line

What does a multivalued attribute represent?

• An attribute that can have many values

• An attribute that is always optional

• An attribute that can have only one value

• An attribute that is derived from others

What shape represents a relationship in Chen notation?

• Circle

• Oval

• Diamond

• Rectangle

What type of relationship is represented by a double rhombus?

• Strong relationship

• Optional relationship

• Weak (identifying) relationship

• Mandatory relationship

What does total participation mean in a relationship?

• Some entities are optional

• Every entity in the set is involved

• Not all entities are involved

• Only one entity is involved

What does the cardinality '1:N' represent?

• One-to-one relationship

• Many-to-one relationship

• One-to-many relationship

• Many-to-many relationship

What is a composite attribute?

• An attribute that can be subdivided into smaller parts

• An attribute that uniquely identifies an entity

• An attribute that is derived from others

• An attribute that can have multiple values