Quiz on Entity-Relationship Model Concepts

What does an Entity represent in the E.R. model?

• A unique identifiable object

• A property of an object

• A collection of attributes

• A relationship between two objects

Which of the following is an example of a Composite Attribute?

• Phone Number

• Age

• Name

• Weight

What type of attribute cannot be divided further?

• Composite Attribute

• Derived Attribute

• Simple Attribute

• Multivalued Attribute

Which attribute type can have multiple values?

• Multivalued Attribute

• Key Attribute

• Single-Valued Attribute

• Stored Attribute

What is a Null Value?

• A value that is applicable

• A known value

• An unknown or not applicable value

• A derived value

What is an Entity Type?

• A single entity

• An attribute of an entity

• A collection of different entities

• A collection of entities with the same attributes

What does an Entity Set represent?

• A type of attribute

• A single entity

• A collection of entities of a particular type at a point in time

• A collection of different types of entities

Which of the following is a Key Attribute?

• Name

• Phone Number

• Age

• Student_ID

What is a Derived Attribute?

• An attribute that cannot be derived

• An attribute that can be derived from other attributes

• An attribute that is stored

• An attribute with multiple values

Which of the following is an example of a Multivalued Attribute?

• Age

• Weight

• Languages known

• First Name