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Alice 2.0 Quiz 3

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
Linear sequences must have ____.
a.
clearly stated entry and exit conditions, but they need not be complete
b.
a complete set of instructions that may be in any order
c.
complete and correct instructions in the proper order
d.
correct instructions, which may be incomplete
 

 2. 
A loop is also known as a(n) ____.
a.
circular sequence
c.
horseshoe sequence
b.
infinite sequence
d.
repetition sequence
 

 3. 
A(n) ____ loop is a special type of sentinel loop in which the sentinel is a counter.
a.
sentinel controlled
c.
sentinel count
b.
count controlled
d.
counted sentinel
 

 4. 
____ is an instruction that sets the first value of the control variable.
a.
Initialization
c.
Processing
b.
Test
d.
Update
 

 5. 
The modern graphical user interface was developed at the ____.
a.
Bell Labs
c.
MIT
b.
Xerox Palo Alto Research Center
d.
University of Massachusetts
 

 6. 
When you click the create new event button in the Event area, a menu showing ____ appears.
a.
all available worlds
c.
all event handlers
b.
the nine Alice event types
d.
all event triggers
 

 7. 
A Boolean variable stores a property that can be ____.
a.
a numeric value
c.
a number between zero and one
b.
an alphabetic value
d.
true or false
 

 8. 
mc008-1.jpgAs shown in the accompanying figure, if a picture of mouse is shown in an event handler, this means ____.
a.
When the mouse is clicked
c.
the second event is visible
b.
Do World.BeginFlying
d.
the event handler uses a mouse
 

 9. 
The methods that will be used as event handlers need to be created ____ the events that will use them.
a.
for
c.
after
b.
before
d.
instead of
 

 10. 
In the Ice Skater example in Chapter 4, without collision detection the ice skater will ____.
a.
bounce off of other objects
b.
skate around other objects
c.
skate through other objects
d.
collide with objects, causing the program to crash
 

True/False
Indicate whether the statement is true or false.
 

 11. 
Computers sometimes round off numbers, especially if a long chain of calculations occurs inside the computer.
 

 12. 
Even if multiple events require the same handler, separate handlers must be written for each event.
 

 13. 
Command-driven user interfaces allow users to point and click with a mouse.
 

 14. 
Modern computer systems contain facilities to let programmers set up event listeners in their software.
 

 15. 
The event trigger When the world starts is the same event trigger as the default event for Alice worlds seen in chapters one through three.
 

Completion
Complete each statement.
 

 16. 
There must be a(n) ____________________to determine which path the computer will follow each time the selection sequence is being executed.
 

 

 17. 
____________________ worlds have mouse and keyboard controls that work while the world plays, like a video game.
 

 

 18. 
Local area networks, the laser printer, the mouse, and even object-oriented programming were developed or refined at ____________________.
 

 

 19. 
To view an object’s methods, right click on the instance in the Object tree and then select ____________________ from the menu that appears.
 

 

 20. 
A(n) ____________________ is a storage location in the computer’s memory that stores a property of an object.
 

 

 21. 
To create an event handler, click on the create new method button on the ____________________ tab.
 

 

 22. 
To create an event handler, after clicking on the create new method button, enter the method name in the ____________________ dialog box.
 

 

 23. 
To create an event that fires when C is typed, replace When a key is typed with ____________________.
 

 

 24. 
Events are used in Alice to let the user ____________________ while a world is playing.
 

 

 25. 
co025-1.jpgAs shown in the accompanying figure, if an object’s ____________________ property is set to false, the object is invisible.
 

 



 
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