WGU C175 OBJECTIVE ASSESSMENT PRACTICE TEST ANSWERS| IT CIS111 TEST BANK 1

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Chapter 2: Data Modeling Multiple Choice 1. The Entity-Relationship (E-R) model is . a. a diagramming technique that describes record structures (i.e. the fields that make up the records of a ... file) b. an alternative to indexing and hashing as a means for providing direct access in files c. a diagramming technique that describes entities, their attributes, and the relationships between them d. an alternative to file design in which attributes are used instead of fields e. a diagramming technique that relates entities to each other, attributes to each other, and relationships to each other Ans: c Response: See page 20 2. An association between entities is a(n) . a. entity type b. entity occurence c. record d. attribute e. relationship Ans: e Response: See page 20 3. A binary relationship is a relationship between two . a. entity types b. attribute types c. associations d. files e. cardinalities Ans: a Response: See page 20 4. The term “binary” in binary relationship indicates that the relationship is between a. two halves of an entity type Chapter 2 Data Modeling b. two entity types c. two divisions of an entity’s attributes d. two attributes e. two relationships Ans: b Response: See page 20 5. The cardinality of a relationship is . a. The minimum number of entities that can be involved in the relationship. b. The maximum number of entities that can be involved in the relationship. c. The minimum number of attributes that can be in the entity types in a relationship. d. The maximum number of attributes that can be in the entity types in a relationship. e. The minimum number of associations that can be involved in the relationship. Ans: b Response: See page 23 6. The modality of a relationship is . a. The minimum number of entities that can be involved in the relationship. b. The maximum number of entities that can be involved in the relationship. c. The minimum number of attributes that can be in the entity types in a relationship. d. The maximum number of attributes that can be in the entity types in a relationship. e. The minimum number of associations that can be involved in the relationship. Ans: a Response: See page 24 7. A one-to-one binary relationship . a. involves a single entity type b. involves two entity types c. allows an occurrence of one entity type to be associated with several occurrences of another entity type d. allows an occurrence of one entity type to be associated with several occurrences of another entity type and vice versa e. restricts the number of attributes that an entity has Ans: b Response: See page 23 Chapter 2 Data Modeling 8. A one-to-many binary relationship allows an occurrence of the entity type on the “one side” of the relationship to be associated with . a. a single occurrence of the same entity type b. multiple occurrences of the same entity type c. a single occurrence of the entity type on the “many side” of the relationship d. multiple occurrences of the entity type on the “many side” of the relationship e. multiple occurrences of the entity type on the “one side” of the relationship Ans: d Response: See page 23 9. A many-to-many binary relationship allows an occurrence of one entity type to be associated with . a. a single occurrence of the same entity type b. multiple occurrences of the same entity type c. a single occurrence of another entity type d. multiple occurrences of another entity type e. multiple occurrences of three entity types Ans: d Response: See page 24 10. A business school’s faculty parking lot has assigned parking spaces. Each professor is entitled to one parking space. This is an example of a relationship. a. one-to-one binary b. one-to-many binary c. many-to-many binary d. one-to-one unary e. one-to-many unary Ans: a Response: See page 24 11. Each building on a university campus has several faculty offices. Each professor has one office. The relationship between campus buildings and professors is a relationship. a. one-to-one binary b. one-to-many binary c. many-to-many binary d. one-to-one unary e. one-to-many unary Ans: b Chapter 2 Data Modeling Response: See page 24 12. In a university, the relationship between courses and their sections can best be described as a relationship. a. one-to-one binary b. one-to-many binary c. many-to-many binary d. one-to-one unary e. one-to-many unary Ans: b Response: See page 24 13. In a university setting, the relationship between students and the professors who have been their instructors is a relationship. a. one-to-one binary b. one-to-many binary c. many-to-many binary d. one-to-one unary e. one-to-many unary Ans: b Response: See page 24 14. Intersection data . a. is an attribute of the entity on the “one side” of a one-to-many relationship b. is an attribute of the entity on the “many side” of a one-to-many relationship c. describes the relationship between two entities in a many-to-many relationship d. describes one of the entities in a many-to-many relationship e. describes one of the entities in a ternary relationship Ans: c Response: See page 25 15. Each student at a university takes many courses; each course is taken by many students. The semester that a student took a course and the grade that the student received in the course is called data. a. index b. key c. pointer d. direct access e. intersection Chapter 2 Data Modeling Ans: e Response: See page 25 16. An associative entity is an alternate way of expressing a(n) . a. one-to-one binary relationship b. one-to-many binary relationship c. many-to-many binary relationship d. entity that has no attributes other than the unique identifier or key e. entity that has no unique identifiers or keys Ans: c Response: See page 27 17. Depending on the attributes and circumstances present, the unique identifier of an associative entity could be any of the following, except . a. the combination of the unique identifiers of the entities in the many-to-many relationship consisting of exactly one field from each entity b. the combination of the unique identifiers of the entities in the many-to-many relationship consisting of several fields c. the combination of the unique identifiers of the entities in the many-to-many relationship plus one or more additional fields that express times or dates d. a single field that is associated with the associative entity and provides unique values e. a unique combination of fields from one of the two entities in the many-to-many relationship Ans: e Response: See page 28 18. A one-to-one unary relationship . a. involves a single entity type b. involves two entity types c. allows an occurrence of one entity type to be associated with several occurrences of another entity type d. allows an occurrence of one entity type to be associated with several occurrences of another entity type and vice versa e. allows an occurrence of one entity type to be associated with several occurrences of the same entity type Ans: a Response: See page 28 Chapter 2 Data Modeling 19. A one-to-many unary relationship allows an occurrence of the entity type on the “one side” of the relationship to be associated with . a. a single occurrence of the same entity type b. multiple occurrences of the same entity type c. a single occurrence of the different entity type on the “many side” of the relationship d. multiple occurrences of the different [Show More]

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