UGC NET CSE | June 2005 | Part 2 | Question: 18

Question

A black hole in a $DFD$ is a :

• A. A data store with no in bound flows
• B. A data store with only in bound flows
• C. A data store with more than one in bound flow
• D. None of these

Answer 1

(B) A black hole in a Data Flow Diagram (DFD) is a data store with only inbound flows. This means that data goes into the process but nothing comes out. It’s called a “black hole” because, much like a real black hole in space, anything that goes in doesn’t come out