Skip to content
Related Articles
Get the best out of our app
Open App

Related Articles

GATE | GATE-CS-2009 | Question 49

Improve Article
Save Article
Like Article
Improve Article
Save Article
Like Article

Which of the following statements are TRUE?

  • I. The context diagram should depict the system as a single bubble.
  • II. External entities should be identified clearly at all levels of DFDs.
  • III. Control information should not be represented in a DFD.
  • IV. A data store can be connected either to another data store or to an external entity.


II and III


II and III


I and III


I, II and III

Answer: (C)


Only statement (I) and (III) are correct. 

Statement (II) is not correct, because all external entities interacting with the system should be represented only in context diagram. The external entities should not appear in the DFDs at any other level. 

Statement (IV) is not correct, because a DFD represents only data flow, and it does not represent any control information. 

So, option (C) is true.

Quiz of this Question
Please comment below if you find anything wrong in the above post

My Personal Notes arrow_drop_up
Last Updated : 30 Nov, 2018
Like Article
Save Article
Similar Reads