Quiz  /  Java Class 9 MCQ Questions With Answers

  • 1. 
    This expression is executed by the for loop only once, regardless of the number of iterations.

  • a. initialization expression
  • b. test expression
  • c. update expression
  • d. preincrement expression

  • 2. 
    What does polymorphism mean?

  • Changing shapes
  • Having many forms
  • Being unchangeable
  • Easy

  • 3. 
    A class that is inherited is called a ______ .

  • superclass
  • Subclass
  • subsetclass
  • Relativeclass

  • 4. 
    What will be the range of possible values generated by the following statement for x?double x = Math.random() * 8 - 5;

  • [0,3)\left[0,3\right)[0,3)
  • [−5,3)\left[-5,3\right)[−5,3)
  • [−5,8)\left[-5,8\right)[−5,8)
  • [0,8)\left[0,8\right)[0,8)
  • [3,8)\left[3,8\right)[3,8)

  • 5. 
    What will the output of the following code segment be?int a = 1, b = 2;System.out.println(++a+”,”+b++);

  • 1,2
  • 2,2
  • 2,3
  • 3,3

  • 6. 
    How would you declare a variable storing a person's name?

  • string name = "Elroy";
  • name String = "Elroy";
  • String name = Elroy;
  • String name = "Elroy";
  • Me llamo Elroy

  • 7. 
    Class dog implements the animal interface.Which IS a valid declaration?

  • Dog d = new Animal();
  • Animal d = new Dog();
  • Animal d = new Animal();

  • 8. 
    The following Syntax is used for?class Subclass-name extends Superclass-name { //methods and fields }

  • Polymorphism
  • Encapsulation
  • Inheritance
  • None of the above

  • 9. 
    A variable that holds true or false

  • String
  • boolean
  • int
  • float
  • Alex Trebek

  • 10. 
    What data type would you use for storing the number of students in a class?

  • boolean
  • String
  • double
  • int

  • 11. 
    What prints out "I love Java" successfully?

  • System.out.println(I love Java);
  • Systemoutprintln("I love Java);
  • System.out.println("I love" + " Java");
  • System.out.println("I love Java")
  • What is love? Baby dont hurt me. Dont hurt me. No more.

  • 12. 
    If more than one class implements an interface, its methods are ____.

  • aggregated
  • public
  • dependent
  • polymorphic

  • 13. 
    String s1 = "hello";String s2 = new String("hello");if (s1 == s2) System.out.print("Hey");else System.out.print("Yo");What is the output?

  • Hey
  • Yo
  • There is no output.
  • This code will not compile.

  • 14. 
    String s = "good job".substring(3, 9);What is the value of s?

  • "d job"
  • "od job"
  • "d jo"
  • "od jo"
  • StringIndexOutOfBoundsException

  • 15. 
    This expression executes at the end of each iteration of the for loop.

  • a. initialization expression
  • b. test expression
  • c. update expression
  • d. statement block

  • 16. 
    Cat class extends Predator class.Which of the following must be true?

  • A Cat object has access to all Predator variables and methods.
  • A Predator object has access to all Cat variables and methods.
  • Cat c = new Predator(); causes an error.
  • Predator p = new Cat();p has access to Cat methods and uses the Predator implementations.

  • 17. 
    What will the following program segment display?for(int a = 2; a <= 10; a += 3)System.out.print(a+””);

  • 2 5 8
  • 2 5
  • 2 5 8 11
  • 2

  • 18. 
    Which of the following statements would successfully call a superclass constructor?

  • superclass();
  • super();
  • superclass("parameter");
  • construct();

  • 19. 
    Int x = "quarantine".indexOf("a");What is the value of x?

  • 4
  • 3
  • 2
  • This code does not compile.
  • StringIndexOutOfBoundsException

  • 20. 
    In Java, each child class can have only one parent.

  • True
  • False

  • 21. 
    What is each repetition of a loop known as?

  • cycle
  • revlolution
  • orbit
  • iteration
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