JAVA Summer Internship Quiz-13

1. What is inheritance in Java?

• A) A way to implement abstraction

• B) A mechanism to create a new class from an existing class

• C) A technique to handle exceptions

• D) A method to optimize code execution

2. What keyword is used to inherit a class in Java?

• A) inherit

• B) extends

• C) implements

• D) inherits

3. Which of the following is true about polymorphism in Java?

• A) It allows a class to have multiple methods with the same name but different parameters

• B) It allows a class to inherit from multiple classes.

• C) It ensures that a method has a fixed implementation.

• D) It is a way to declare abstract methods in a class.

4. What does the super keyword do in Java?

• A) It creates a new instance of the current class.

• B) It refers to the immediate parent class of the current class.

• C) It is used to call methods of the current class.

• D) It terminates the current loop.

5. What is an abstract class in Java?

• A) A class that can be instantiated but has abstract methods.

• B) A class that cannot be instantiated and may contain abstract methods.

• C) A class that implements all methods in its interface.

• D) A class that only contains static methods.

6. Which of the following can be abstract in an abstract class?

• A) Methods only

• B) Fields only

• C) Constructors only

• D) Methods and fields

7. How do you achieve runtime polymorphism in Java?

• A) By using abstract classes

• B) By using method overloading

• C) By using method overriding

• D) By using static methods

8. Can an interface in Java contain instance variables?

• A) Yes, if they are public

• B) Yes, if they are static and final

• C) No, interfaces cannot have instance variables

• D) Yes, if they are private

9. What is method overloading?

• A) Defining multiple methods with the same name but different parameter lists within the same class.

• B) Defining multiple methods with the same name but different return types within the same class.

• C) Overriding methods in a subclass with the same name as in the superclass.

• D) Creating multiple classes with the same name.

10. Which keyword is used to achieve abstraction in Java?

• A) abstract

• B) virtual

• C) static

• D) public