Chapter 8 Entity Relationship (E-R) Modeling MCQs

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1. A many to many relationships between two entities usually results in how many tables?





2. An ________ is a set of entities of the same type that share the same properties, or attributes.





3. Entity is a _________.





4. Every weak entity set can be converted into a strong entity set by:





5. E-R modeling technique is a ______.





6. In ER model the details of the entities are hidden from the user. This process is called:





7. The attribute AGE is calculated from DATE_OF_BIRTH. The attribute AGE is





8. Which of the following can be a multivalued attribute?





9. Which of the following is a single valued attribute?





10. The relationship between the entities is represented graphically by using_____.





11. Which of following represents entity?





12. In an ER diagram, entities are represented by _______.





13. A collection of entities that have common attributes is called





14. The characteristics of an entity are called_____.





15. In a relational database model, the number of records in a table is called





16. Strong entity is also called





17. The process of defining one or more subtype of a supertype is called_____.





18. The entity types Car and Truck can be generalized into the entity type___.





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