System analysis and design True or False Questions 1- An entity is the basic bui

Question

System analysis and design

True or False Questions

1- An entity is the basic building block for a data model.

2- Data flows should always begin or end at a process.

3- The three steps in creating an ERD are: (1) identify the entities; (2) identify the processes; (3) identify the relationships.

4- ERD’s are drawn in several levels: Context ERD diagrams; Level 0 ERD diagrams; Level 1 ERD diagrams.

5- Data models can be either logical or physical.

6- Ideally, a data flow diagram should not have more than about twelve processes.

7- In an entity called STUDENT, you might find attributes of Student-ID, Last-Name, First-Name and cell-phone.

8- A Level-0 Diagram is data flow diagram that is the result of nested decompositions of a series of sub processes from a process.

9- The major inputs and major outputs listed on the use case provide a list of the sources and destinations of the inflows and outflows on the processes on a data flow diagram.

10- The decision to make, to buy, or to outsource influences the design tasks that are performed throughout the rest of the design phase.

Explanation / Answer

1. An entity is the basic building block for a data model.

Ans :- True

Entities are objects or concepts that can have data stored about them in Data Model.

2. Data flows should always begin or end at a process

Ans :- True

This is the Rationale of Data Model .

3.The three steps in creating an ERD are: (1) identify the entities; (2) identify the processes; (3) identify the relationships.

Ans :- False

Here are the Correct Steps :-

1.Identify the entities

2.Identify relationships

3.Describe the relationship

4.Add attributes

5.Complete the diagram

4. ERD’s are drawn in several levels: Context ERD diagrams; Level 0 ERD diagrams; Level 1 ERD diagrams.

Ans :- False

DFD's are drawn in several levels: Context ERD diagrams; Level 0 ERD diagrams; Level 1 ERD diagrams.

5. Data models can be either logical or physical

Ans :- True

6.Ideally, a data flow diagram should not have more than about twelve processes.

Ans :- False

7. In an entity called STUDENT, you might find attributes of Student-ID, Last-Name, First-Name and cell-phone.

Ans :- True

8. A Level-0 Diagram is data flow diagram that is the result of nested decompositions of a series of sub processes from a process.

Ans :- False.

A Level-0 Diagram is Diagram ,which reveals general processes and data stores.

9. The major inputs and major outputs listed on the use case provide a list of the sources and destinations of the inflows and outflows on the processes on a data flow diagram.

Ans :-   True

10. The decision to make, to buy, or to outsource influences the design tasks that are performed throughout the rest of the design phase.

Ans :- True

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