Pre-assessment for VR Development

Quiz

•

Intermediate

•

+60 XP

•

15m

•

Unity Technologies

Pre-assessment for VR Development thumbnail

The purpose of this pre-assessment is to make sure that you don’t have any knowledge gaps before moving on with the Custom VR Development mission.

If you pass the pre-assessment, you should have no problem completing the rest of this pathway.

If you don’t pass the pre-assessment, we’ll provide some resources in the question feedback for each specific knowledge area. Try to spend a good amount of time improving your skills in these areas, then return here and try again!

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Question 1

Which of the following statements are true about virtual methods?

Select all correct answers.

Select all correct answers

You can override virtual methods in a child class.

Virtual methods cannot be private.

A virtual method is only implemented if it is overridden by a child class.

A virtual method declared in a child class can be accessed by its parent class.

Question 2

Read the documentation from the Unity Scripting API about Random.Range and then read the code below.

float randomFloat = Random.Range(0f, 100f);
int randomInt = Random.Range(0, 100);

Which of the following are possible values for the randomFloat and randomInt variables?

Select only one

randomFloat = 100.0f;

randomInt = 0;

randomFloat = 100.0f;

randomInt = 100;

randomFloat = 50.5f;

randomInt = 100;

randomFloat = 0.0f;

randomInt = 50.5;

Question 3

Which of the following statements are true about parent (base) and child (derived) classes?

Select all correct answers.

Select all correct answers

In a class declaration, a derived class can only define a single base class.

Protected variables and methods can be accessed from any child class.

Private variables and methods can be accessed from any child class.

If Class C derives from Class B, which derives from Class A, Class C only inherits behaviors from Class B.

None of the above.

Question 4

The code below uses the static modifier:

public class Enemy : MonoBehaviour {
   public static int EnemyHealth = 100;
}

What is the effect of using the static modifier here?

Select all correct answers.

Select all correct answers

It allows you to access the EnemyHealth variable from another class using only Enemy.EnemyHealth. You do not need a reference to the class.

Only a single copy of this variable can exist, which means that if you had multiple enemies, they could not have different EnemyHealth values.

It means that this variable cannot be modified from any other class.

It prevents the value of this variable from changing after the first time it is set.

Question 5

You are trying to create a new method that takes a number and multiplies it by two. Which method would do that?

Method 1

private float DoubleNumber() { 
  return number *= 2;
}

Method 2

private float DoubleNumber(float number) { 
  return number *= 2;
}

Method 3

private void DoubleNumber(float number) {
  return number *= 2;
}

Method 4

private void DoubleNumber() {
  return number *= 2;
}

Select only one

Method 1

Method 2

Method 3

Method 4

Question 6

The following message was displayed in the console: “Monica has 20 dollars”.

string[] names = new string[] { "Steve", "Monica", "Eric" };
int money = 5;

void Start() {
  money *= 2;
  PrintNames();
}

void PrintNames () {
  Debug.Log("Monica has " + money/2 + " dollars"); // Line 1
  Debug.Log(names[1] + " has " + money*2 + " dollars"); // Line 2
  Debug.Log(names[2] + " has " + money*2 + " dollars"); // Line 3
  Debug.Log(names[Monica] + " has " + money/2 + " dollars"); // Line 4
}

Which of the line options in the PrintNames function produced it?

Select only one

Line 1

Line 2

Line 3

Line 4

Question 7

Which of the following statements about methods are correct?

Select all correct answers.

Select only one

Methods must be passed at least one parameter.

Methods with a “void” return type cannot be passed parameters.

A method with an “int” return type could include the code “return true;”.

If there was a Method declared as “private void RenameObject(string newName)”, you could call that method with “RenameObject(“Charlie”);”

Question 8

The code below shows the manual implementation of a property in C#.

private string _playerName;
public string PlayerName
{
   get { return _playerName; }
   set { _playerName = value; }
}

There is a more concise “auto-implemented” version of this code that accomplishes the same thing. What is it?

Select only one

public string PlayerName { get; set; }

private string PlayerName { get; private set; }

public string _playerName { get PlayerName; set _playerName; }

public string PlayerName { get(); set(_playerName); }

Submit answers

To calculate your score, submit your answers to the quiz. A passing score will mark this quiz complete.

Correct answers needed to pass

6/8

Retake allowed after

24 Hours 0 Mins