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MCQs DFD SDLDC DataModeling

The document contains multiple-choice questions (MCQs) covering topics such as Data Flow Diagrams (DFDs), Data Modeling, the System Development Life Cycle (SDLC), and Data Dictionaries. Key concepts include the differences between Level 0 and Level 1 DFDs, the importance of process numbering, and the roles of various components in data modeling. Additionally, it addresses the purpose of integrity constraints and the significance of data dictionaries in system design.

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Shehryar Ali Khilji
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15 views4 pages

MCQs DFD SDLDC DataModeling

The document contains multiple-choice questions (MCQs) covering topics such as Data Flow Diagrams (DFDs), Data Modeling, the System Development Life Cycle (SDLC), and Data Dictionaries. Key concepts include the differences between Level 0 and Level 1 DFDs, the importance of process numbering, and the roles of various components in data modeling. Additionally, it addresses the purpose of integrity constraints and the significance of data dictionaries in system design.

Uploaded by

Shehryar Ali Khilji
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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MCQs on DFDs, Data Modeling, SDLC, Data Dictionaries & More

1. What is the main difference between a Level 0 DFD and a Level 1 DFD?

A) Level 0 includes detailed processes

B) Level 1 contains external entities

C) Level 1 breaks down the single process of Level 0 into subprocesses

D) Level 0 shows internal data stores

Answer: C

2. Why is process numbering important in DFDs?

A) To define data storage

B) To ensure consistency and track subprocesses

C) To calculate data volume

D) To identify users

Answer: B

3. Which symbol is used for data stores in a DFD?

A) Oval

B) Arrow

C) Double vertical lines or open-ended rectangle

D) Circle

Answer: C

4. A passive data dictionary is:

A) Automatically updated with system changes

B) Integrated with the DBMS

C) Manually maintained and not linked to the database

D) Used for data recovery only

Answer: C
5. Which type of data dictionary provides better real-time data tracking?

A) Passive

B) Manual

C) Static

D) Active

Answer: D

6. Why are integrated systems better in performance?

A) They reduce electricity usage

B) They remove all external users

C) They allow for faster access and reduce redundancy

D) They use more hardware

Answer: C

7. The main purpose of a cross reference matrix is to:

A) Encrypt data

B) Track user activity

C) Show relationships between elements like processes and data stores

D) Sort files alphabetically

Answer: C

8. What does the cross reference matrix help in identifying?

A) Data types

B) CPU performance

C) Process-data relationships

D) System errors

Answer: C

9. What is the first phase in the System Development Life Cycle (SDLC)?

A) Design
B) Testing

C) Preliminary Investigation

D) Implementation

Answer: C

10. What is the output of the Analysis phase in SDLC?

A) Feasibility Report

B) Database Table

C) Requirements Specification Document

D) System Code

Answer: C

11. Which of the following is *not* a component of a data model?

A) Data structure

B) Integrity constraints

C) Presentation layer

D) Manipulation language

Answer: C

12. What is the purpose of integrity constraints in a data model?

A) Speed up the processor

B) Prevent invalid data entries

C) Optimize power consumption

D) Control software installation

Answer: B

13. Which of these best explains the importance of data modeling?

A) It helps with social media performance

B) It creates marketing plans

C) It serves as a blueprint for designing a logical and physical database


D) It defines website layout

Answer: C

14. In data modeling, what does the manipulation language component do?

A) Draws DFDs

B) Describes how data is accessed and modified

C) Sets up firewalls

D) Runs antivirus scans

Answer: B

15. In DFDs, external entities are represented by which symbol?

A) Square

B) Arrow

C) Double circle

D) Diamond

Answer: A

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