OOAD MCQ: Events and Signals

OBJECT ORIENTED ANALYSIS AND DESIGN MCQ WITH ANSWERS

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EVENTS AND SIGNALS: OOAD MCQ

1. ________ are used to model records of activities that describe what happened in the past/what need to be done later. 

a. Events 

b. Signal 

c. Node 

d. Object

2. ________ transitions are handled without causing a change in state. 

a. Internal

b. Substates

c. Name

d. Deferred event 

3. Exceptions are ________

a. internal signal 

b. state 

c. association 

d. generalization

4. A ________  represents a named object that is dispatched asynchronously b then received by another. 

 a. events 

b. signal

c. node 

d. name 

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5. A ________  is an event that represents the passage of time. 

a. events 

b. node 

c. time event 

d. signal 

6. Call event represents the  of ________  an operation. 

a. class 

b. use case 

c. dispatch 

d. activity 

7. Time event is modeled by the keyword  ________

a. when 

b. after

c. signal 

d. change 

8. Change event is modeled by the keyword ________

a. after 

b. when 

c. time

d. signal 

9. Exceptions are arranged in ________

a. hierarchy 

b. sequence 

c. linear 

d. circle 

10. ________   have a lot in common with plain classes. 

a. Events 

b. Node 

c. Time event 

d. Signals 

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Answers:

1. Correct Answer: a 

What happened in the past/what need to be done later is modeled by events.

2. Correct Answer: a 

Internal transitions are handled without causing a change in state.

3. Correct Answer : a 

Exceptions are an example of internal signal. It is an asynchronous event.

4. Correct Answer: b

Named object that is dispatched asynchronously by one object and then received by another is represented by signal.

5. Correct Answer: c 

The passage of time is an event known as time event.

6. Correct Answer: c 

A call event represents the dispatch of an operation and it is a synchronous event.

7. Correct Answer: b 

Time event is modeled by using the keyword 'after' followed by some expression that evaluates to a period of time which can be simple or complex.

8. Correct Answer: b 

Chang event is modeled by using the keyword 'when' followed by some Boolean expression.

9. Correct Answer: a 

In modeling the exceptions, arrange the exceptions in a hierarchy.

10. Correct Answer: d

Plain classes are common with signals.

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