Entity Relationship Diagrams and Data Modeling Quiz
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Questions and Answers

Which of the following diagrams represents the logical elements of a system but does not depict the physical system?

  • System flowchart
  • Program flowchart
  • Entity relationship (ER) diagram
  • Data flow diagram (DFD) (correct)

    • What is the purpose of an entity relationship (ER) diagram?

  • To represent the relationship between business entities (correct)
  • To depict the physical components of a system
  • To document the data flows in a system
  • To model the processes of a system

    • What does the term 'cardinality' refer to in the context of entity relationship diagrams?

  • The type of relationship between entities
  • The degree of complexity of the diagram
  • The number of entities in the diagram
  • The numeric mapping between entities (correct)

    • Which of the following statements is true about data flow diagrams (DFDs) and entity relationship (ER) diagrams?

    <p>DFDs model system processes, while ER diagrams model system data</p> Signup and view all the answers

    Which version of the entity relationship (ER) model is widely used in accounting information systems (AIS)?

    <p>The REA model</p> Signup and view all the answers

    Which of the following is NOT a component represented in a data flow diagram (DFD)?

    <p>Entity Relationship Diagrams</p> Signup and view all the answers

    What is the purpose of a data model in the context of database design?

    <p>To serve as a blueprint for the physical database</p> Signup and view all the answers

    In an entity relationship (ER) diagram, the cardinality of a relationship between two entities indicates the:

    <p>Minimum and maximum number of instances of one entity that can be associated with each instance of the other entity</p> Signup and view all the answers

    Which of the following documentation techniques uses symbols to represent the flow of data and control through a system?

    <p>Data Flow Diagram</p> Signup and view all the answers

    The REA (Resources, Events, Agents) model is a conceptual framework for modeling:

    <p>Business processes and accounting information systems</p> Signup and view all the answers

    Which of the following is a problem associated with the flat-file approach to data management?

    <p>Increased data redundancy</p> Signup and view all the answers

    Which of the following is NOT a benefit of using digital record audit trails compared to hard-copy document audit trails?

    <p>More transparent</p> Signup and view all the answers

    What do resources, events, and agents represent in the REA model?

    <p>Data entities</p> Signup and view all the answers

    In the context of ER diagrams, what does cardinality refer to?

    <p>Numerical mapping between entities</p> Signup and view all the answers

    How is a DFD different from an ER diagram?

    <p>ER diagram models data and DFD models processes</p> Signup and view all the answers

    Which documentation technique reveals the internal structure of digital records in a database table?

    <p>Record layout diagrams</p> Signup and view all the answers

    What does the CARDINALITY term 'one-to-many' signify in an ER diagram?

    <p>Each entity is connected to many entities of another type</p> Signup and view all the answers

    What does a Document flowchart represent if a manual system is involved?

    <p>Processing of a single transaction</p> Signup and view all the answers

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