Entity Relationship Model Quiz

Isla is studying database design in her computer science class. What is the Entity-Relationship model?

• The Entity-Relationship model is a statistical model used in machine learning.

• The Entity-Relationship model is a conceptual data model used in database design to represent the relationships between entities.

• The Entity-Relationship model is a type of data structure used in computer graphics.

• The Entity-Relationship model is a programming language used to create web applications.

Answer explanation

The correct choice defines the Entity-Relationship model as a conceptual data model used in database design, which accurately describes its purpose of representing relationships between entities.

Sophia is studying the Entity-Relationship model in her database class. What does cardinality represent in this model?

• The cardinality in the Entity-Relationship model represents the relationship between entities.

• The cardinality in the Entity-Relationship model represents the hierarchy of the entities.

• The cardinality in the Entity-Relationship model represents the attributes of the entities.

• The cardinality in the Entity-Relationship model represents the size of the entities.

Answer explanation

The correct choice is that cardinality represents the relationship between entities in the Entity-Relationship model. It defines how many instances of one entity relate to instances of another, such as one-to-one or many-to-many.

In a class project, Jackson is trying to understand what attributes are in the Entity-Relationship model. What are attributes in this context?

• Properties or characteristics of an entity

• Actions performed on entities

• Methods of an entity

• Relationships between entities

Answer explanation

In the Entity-Relationship model, attributes refer to the properties or characteristics of an entity. They describe the details that define the entity, making this the correct choice.

In a school database, what is an entity in the Entity-Relationship model?

• An entity is a relationship between two other entities.

• An entity is a type of attribute in the model.

• An entity is a data structure used to store information.

• An entity is a real-world object or concept that has attributes and can be uniquely identified, such as a student like Henry or Benjamin.

Answer explanation

An entity in the Entity-Relationship model represents a real-world object or concept, like a student, that has attributes and can be uniquely identified. This distinguishes it from relationships or attributes.

Anika is studying the Entity-Relationship model in her database class. What are the types of cardinality relationships she should be aware of?

• one-to-one

• one-to-few

• many-to-few

• one-to-one, one-to-many, many-to-many

Answer explanation

In the Entity-Relationship model, the main types of cardinality relationships are one-to-one, one-to-many, and many-to-many. The other options, one-to-few and many-to-few, are not standard cardinality types.

In a school, each student has exactly one locker assigned to them. What is the cardinality of the relationship between students and lockers?

• 1:N

• 1:2

• N:N

• 1:1

Answer explanation

The relationship between students and lockers is 1:1 because each student has exactly one locker assigned to them, and each locker is assigned to exactly one student.

In a classroom, how many students can one teacher manage effectively?

• None

• Many

• One

• Few

Answer explanation

A teacher can effectively manage many students at once, utilizing strategies like group work and classroom management techniques. This allows for a productive learning environment, making 'Many' the correct choice.

In a school, each teacher can teach many students, but each student can have only one teacher for a specific subject. What is the cardinality of this Many-to-One relationship?

• many

• none

• few

• one

Answer explanation

In this Many-to-One relationship, each student has exactly one teacher for a specific subject, indicating that the cardinality from the student's perspective is 'one'. Thus, the correct answer is 'one'.

In a school project, Emma and her classmates are working on a group assignment. They need to understand the cardinality of relationships between students and their chosen topics. What is the cardinality of a Many-to-Many relationship?

• None

• Few

• One

• Many

Answer explanation

In a Many-to-Many relationship, multiple students can choose multiple topics, indicating that the cardinality is 'Many'. Therefore, the correct answer is 'Many'.

In a classroom, how many students can be paired with each other for a group project?

• 1:1

• N:N

• M:N

• 1:N

Answer explanation

In a classroom setting, pairing students typically means each student works with one other student, making the correct choice 1:1. This ensures equal participation and collaboration in the group project.