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Difference: Activity Diagram and Sequence Diagram.
 Question Submitted By :: UML
I also faced this Question!!     Answer Posted By  
# 1
Activity Diagram mainly represent process flows captured in

Sequence diagram mainly represent interaction between
different objects.It is time ordered means exact
interactions between objects is represented step by step.
Is This Answer Correct ?    74 Yes 9 No
# 2
Sequence diagram describes the behavior of several objects
in a single use case.
activity diagrams are good at showing the general sequence
of actions for several objects and use cases.
Is This Answer Correct ?    36 Yes 8 No
Dharmendra Verma
# 3
In UML Activity diagram is used for functional modeling
while sequence diagram is used to dynamic modeling purpose.

A typical workflow can be repersented by activity diagram
while sequence diagram is more about exploring into use
case by showing intercation between objects.

Note: Activity diagram also repersents an object role in
workflow like sequence diagram but level of repersenation
is not dynamic like sequence diagram repersentation.

for example: Object lifeline and sequence of interaction
is detailed in sequence diagram while activity diagram does
not show such detail about an object.
Is This Answer Correct ?    27 Yes 5 No
Kumar Rohit
# 4
give examples for both of them 
Is This Answer Correct ?    8 Yes 1 No
# 5
activity diagram is not dynamic diagram and it is used to
see the workflow of the software.
And sequence diagram is lifeline of the the object and it
isd dynamic modeling.
Is This Answer Correct ?    9 Yes 7 No

Other UML Interview Questions
  Question Asked @ Answers
In an Java interview, the Following question was asked.. How do you represent a class in UML? ABC 2
how does project risk factor affects the spiral effect of software in software development??   1
Explian following terms: Constraint Rules, Design by contract.   1
What is the purpose of a use case diagram? Satyam 12
Difference Between Attribute and Association.   4
Can you think of some nice examples where multiple actors are associated with a use case ?   2
What is the difference between static and dynamic Classificaition.Give some examples.   3
Difference between Sequence Diagrams, Collaboration Diagrams.   1
UML: IS it a process, method or notation? Infosys 6
What are the four phases of the Unified Process ? Maruti-Suzuki 2
What are associative classes? VSNL 2
Can we use UML for user interface (UI) design? TCS 2
For more UML Interview Questions Click Here 

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