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C# in Unity Quiz 2

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

 1. 
Match the following animation methods with its set of parameters
mc001-1.jpg
a.
1A, 2B, 3C
c.
1B, 2A, 3C
b.
1A, 2C, 3B
d.
1C, 2A, 3B
 

 2. 
When you run a project with the code below, you get the following error: “NullReferenceException: Object reference not set to an instance of an object.” What is
most likely the problem?
mc002-1.jpg
a.
There is no object named “Player” in the scene
c.
. The Enemy object does not have a Rigidbody component
b.
The Player object does not have a collider
d.
The “Start” method should actually be “Update”
 

 3. 
You’re trying to write some code that creates a random age between 1 and 100 and prints that age, but there is an error. What would fix the error?
mc003-1.jpg
a.
Add a new line after line 8 that says “return age;”
c.
Change line 1 to “private float age”
b.
Add the word “int” to line 8, so
it says “int age = …”
d.
On line 7, change the word “private” to “void”
 

 4. 
Which of the following follows Unity’s naming conventions (especially as it relates to capitalization)?
mc004-1.jpg
a.
Line D
c.
Line A
b.
Line C
d.
Line B
 

 5. 
The code below produces “error CS0029: Cannot implicitly convert type 'float' to 'UnityEngine.Vector3'”. Which of the following would remove the error?
mc005-1.jpg
a.
On line 3, change “=” to “+”
c.
None of the options
b.
Either On line 1, change “Vector3” to “float” OR On line 3, change “=” to “+”
d.
On line 1, change “Vector3” to “float”
 

 6. 
You are trying to create a new method that takes a number and multiplies it by two. Which method would do that?
mc006-1.jpg
a.
Method A
c.
Method D
b.
Method C
d.
Method B
 

 7. 
Given the animation controller / state machine below, which code will make the character transition from the “Idle” state to the “Walk” state?
mc007-1.jpg
a.
setFloat(“Speed_f”, 0.3f);
c.
setTrigger(“Speed_f”);
b.
setInt(“Speed_f”, 1);
d.
setFloat(“Speed_f”, 0.1f);
 

 8. 
The following message was displayed in the console: “Monica has 20 dollars”. Which of the line options in the PrintNames function produced it?
mc008-1.jpg
a.
Option B
c.
Option A
b.
Option D
d.
Option C
 

 9. 
By default, what will be the first state used by this Animation Controller?
mc009-1.jpg
a.
“NotCrouched”
c.
“Crouch_Up”
b.
“Any State”
d.
“Death”
 

 10. 
The code below produces the error, “error CS0029: Cannot implicitly convert type 'UnityEngine.GameObject' to 'UnityEngine.Rigidbody'”. What could be done to fix
this issue?
mc010-1.jpg
a.
. On line 3, add “.GetComponent<Rigidbody>()” before the semicolon
c.
On line 3, delete “.gameObject”
b.
On line 2, change “gameObject” to “Rigidbody”
d.
On line 1, change “collision” to “Rigidbody”
 

 11. 
Which of the following do you think makes the most sense for a simple movement state machine?
mc011-1.jpg
a.
Image B
c.
Image A
b.
Image C
 

 12. 
Which of the following conditions properly tests that the game is NOT over and the player IS on the ground
mc012-1.jpg
a.
Line A
c.
Line C
b.
Line B
d.
Line D
 

 13. 
Which comment best describes the code below?
mc013-1.jpg
a.
// If the enemy collides with a spike, destroy the spike
c.
// If the player collides with an enemy, destroy the enemy
b.
// If the enemy collides with a spike, destroy the enemy
d.
// If the player collides with a spike, destroy the spike
 

 14. 
Which of these is the correct way to get a reference to an AudioSource component on a GameObject?
mc014-1.jpg
a.
Line C
c.
Line B
b.
Line D
d.
Line A
 

 15. 
Your game has just started and you see the error, “UnassignedReferenceException: The variable playerIndicator of PlayerController has not been assigned.” What is likely the solution to the problem?
mc015-1.jpg
a.
The PlayerController script must be assigned to the player object
c.
The playerIndicator variable needs to be made private
b.
An object needs to be dragged onto the playerIndicator variable in the inspector
d.
PlayerController variable in the playerIndicator script needs to be declared
 

 16. 
Which of the following variable declarations observes Unity’s standard naming conventions (especially as it relates to capitalization)?
mc016-1.jpg
a.
3 and 6
c.
1 and 5
b.
2 and 4
d.
4 and 5
 

 17. 
Which of the following statements about functions/methods are correct:
mc017-1.jpg
a.
Only B is correct
d.
None are correct
b.
A and B are correct
e.
B and C are correct
c.
Only D is correct
 

 18. 
Which of the following is most likely the condition for the transition between “Run” and “Walk” shown below?
mc018-1.jpg
a.
Speed_f is Greater than 0.5
c.
Animation_int is Less than 10
b.
Speed_f is Less than 0.5
d.
Jump_b is true
 

 19. 
You are trying to assign the powerup variable in the inspector, but it is not showing up in the Player Controller component. What is the problem?
mc019-1.jpg
a.
You cannot assign GameObject type variables in the inspector
c.
The powerup variable should be public instead of private
b.
You cannot declare a powerup variable in the Player Controller Script
d.
The PlayerController class should be private instead of public
 

 20. 
You are trying to STOP spawning enemies when the player has died and have created the two scripts below to do that. However, there is an error on the underlined code, “isAlive” in the EnemySpawner script. What is causing that error?
mc020-1.jpg
a.
“isAlive” must start with a capital “I” (“IsAlive”)
c.
The “p” should be capitalized in “playerController.isAlive”
b.
The “bool” in the PlayerController class needs a “public” access modifier
d.
The if-statement cannot be in the Update method
 



 
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