AP CSA Unit 2 Practise MCQ

A student has created a Cat class. The class contains variables to represent the following.

• A String variable called color to represent the color of the cat

• A String variable called breed to represent the breed of the cat

• An int variable called age to represent the age of the cat

The object myCat will be declared as type Cat. Which of the following descriptions is accurate?

• An attribute of breed is String.

• color, breed, and age are instances of the Cat class.
  

• Cat is an instance of the myCat class.

• age is an attribute of the myCat object.

• An attribute of Cat is myCat.
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A student has created a Movie class. The class contains variables to represent the following.

• A String variable called title to represent the title of the movie

• A String variable called director to represent the director of the movie

• A double variable called rating to represent the rating of the movie

The object scaryMovie will be declared as type Movie. Which of the following descriptions is accurate?

• An attribute of the scaryMovie class is title.

• scaryMovie is an instance of the Movie class.
  

• Title, director, and rating are instances of the scaryMovie object.
  

• An attribute of the Movie instance is scaryMovie
  

• Movie is an instance of scaryMovie.
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Which of the following code segments will correctly create an instance of a Person object?

• new Person john = Person("John", 16);
  

• Person john("John", 16);
  

• Person john = ("John", 16);
  

• Person john = new Person("John", 16);
  

• Person john = new Person(16, "John");
  
  

What is the value of len after the following executes?

• 2

• 10

• 11

• 8

What is the value of pos after the following code executes?

• -1

• 3

• 5

• 4

What is the value of s1 after the following code executes?

• Hey

• he

• H

• h

Consider the following class. Which of the following code segments would successfully create a new Movie object?

• Movie four = new Movie("My Cool Movie", "Steven Spielburg", "4.4");
  

• Movie one = new Movie("Harry Potter", "Bob");
  

• Movie two = new Movie("Sponge Bob");
  

• Movie three = new Movie(title, rating, director);
  

• Movie five = new Movie(t);
  
  

Answer explanation

The first movie is ignored since there is a second movie method which supersedes the first

Given the BankAccount class definition below, what is the output of the code in the main method?

• 100.0

• 110.0

• 10.0

• 90.0

Answer explanation

✔️ The constructor sets the total to 100, the withdraw method subtracts 30, and then the deposit method adds 40.

Given the following code segment, what is the value of num when it finishes executing? Math.random() returns a random decimal number between 0 and up to 1, for example 0.4.

• random number from 0 - 4

• random number from 1 - 5

• random number from 5 - 9

• random number from 5 - 10

Answer explanation

✔️ Math.random returns a value from 0 to not quite 1. When you multiply it by 5 you get a value from 0 to not quite 5. When you cast to int you get a value from 0 to 4. Adding 5 gives a value from 5 to 9.

Given the following code segment, what is the value of num when it finishes executing? Math.random() returns a random decimal number between 0 and up to 1, for example 0.4.

• random number from -5 to 5

• random number from 0 to 5

• random number from 0 to 10

• random number from -5 to 4