Practice polymorphism Quizzes

Enhance your polymorphism skills with carefully curated quizzes designed to improve concept clarity and real-world application. Each question reinforces key principles through active practice. Ideal for students and professionals, these quizzes help you learn faster, stay sharp and strengthen your overall technical expertise.

Explore All polymorphism Quizzes

Learn polymorphism step by step with interactive quizzes designed for beginners and learners revising key concepts. Build a strong foundation with clear, structured practice in polymorphism.

Question 1

What is polymorphism in Object-Oriented Programming (OOP)?

The ability to use the same function name for different functionalities.

The ability to inherit properties from a base class.

The mechanism of wrapping data and methods into a single unit.

The process of restricting access to certain members of a class.

Question 2

What are the types of polymorphism in OOP?

Static and Dynamic

Single and Multiple

Public and Private

Inheritance and Encapsulation

Question 3

Which of the following is an example of compile-time polymorphism?

Function Overloading

Abstract Classes

Interfaces

Function Overriding

Question 4

What is the difference between method overloading and method overriding?

Overloading is runtime polymorphism, overriding is compile-time polymorphism

Overloading happens in a subclass, overriding happens in the same class

Overloading occurs in the same class, overriding occurs in a derived class

Overloading requires inheritance, overriding does not

Question 5

Which statement about polymorphism is correct?

Polymorphism enables a function to be used for different types of objects.

Polymorphism prevents method overriding.

Polymorphism is only applicable to function overloading.

Polymorphism allows multiple classes to have the same properties.

Question 6

What is the key feature of runtime polymorphism?

No inheritance required

Method overloading

Dynamic method dispatch

Compile-time resolution

Question 7

Which of the following statements about function overloading and function overriding is correct?

Function overriding does not support dynamic binding

Function overloading is resolved at compile-time, while function overriding is resolved at runtime

Function overloading requires inheritance, while function overriding does not

Function overloading occurs at runtime, while function overriding occurs at compile time

Question 8

What is method overriding in Java?

Defining a method with the same name and parameters in a child class

Declaring a new method with the same name in the same class

Changing the return type of an existing method

Making a method static

Question 9

Which keyword is used in Java to prevent method overriding?

abstract

final

super

static

Question 10

What will be the output of the following Java program?

class A {
    void display() { System.out.println("Class A"); }
}
class B extends A {
    void display() { System.out.println("Class B"); }
}
public class Main {
    public static void main(String[] args) {
        A obj = new B();
        obj.display();
    }
}

Class B

Runtime Error

Compilation Error

Class A

Question 11

Which of the following statements is true about operator overloading in C++?

It is a type of compile-time polymorphism

It is achieved using function overloading

It allows redefining how operators work for user-defined types

All of the above

Question 12

In C++, which keyword is used to achieve runtime polymorphism?

static

override

friend

virtual

Question 13

What is an abstract class in Java?

A class that cannot be instantiated

A class that must contain at least one abstract method

A class that allows method overriding

All of the above

Question 14

How does Java implement runtime polymorphism?

Function overloading

Early binding

Dynamic method dispatch

Virtual function table (vtable)

Question 15

What is a virtual function in C++?

A function that is resolved at runtime

A function with no implementation

A function that cannot be overridden

A function that supports operator overloading

Question 16

What is the role of the vtable in C++?

It prevents method overriding.

It speeds up compile-time polymorphism.

It stores a list of all functions in a class.

It stores pointers to virtual functions.

Question 17

Which keyword in Java is used to call the parent class method explicitly in method overriding?

super

base

parent

override

Question 18

What will be the output of the following program?

#include <iostream>
using namespace std;

class Base {
public:
    virtual void show() { cout << "Base"; }
};
class Derived : public Base {
public:
    void show() { cout << "Derived"; }
};
int main() {
    Base b;
    Derived d;
    Base* ptr = &b;
    ptr->show();
    return 0;
}

Derived

Base

Compilation Error

Undefined Behavior

Question 19

What will be the output of the following program?

#include <iostream>
using namespace std;

class Base {
public:
    virtual void show() { cout << "Base"; }
};
class Derived : public Base {
public:
    void show() { cout << "Derived"; }
};
int main() {
    Base b;
    Derived d;
    Base* ptr = &d;
    ptr->show();
    return 0;
}

Undefined Behavior

Derived

Base

Compilation Error

Question 20

What will be the output of the following program?

#include <iostream>
using namespace std;

class Base {
public:
    virtual void show() { cout << "Base"; }
};
class Derived : public Base {
public:
    void show() { cout << "Derived"; }
};
int main() {
    Base b;
    Derived d;
    Derived* ptr = &b;
    ptr->show();
    return 0;
}

Error

Undefined Behavior

Base

Derived

Question 21

Which of the following is true about abstract classes in C#?

An abstract class can have concrete methods.

Abstract classes must have at least one abstract method.

Abstract classes can be instantiated.

Interfaces and abstract classes are the same.

Question 22

What happens when a base class function is declared as virtual in C++?

The function call is resolved at compile-time

The function cannot have a body

The function call is resolved at runtime using vtable

The function cannot be overridden in derived classes

Question 23

What is true about method overriding in Java?

Overriding is determined at compile time

A method cannot be overridden if it is declared static

Overriding methods must have the same return type and parameters

The return type of the overriding method can be a subclass of the return type of the overridden method

Question 24

Which keyword prevents method overriding in C#?

final

private

sealed

abstract

Question 25

What happens if a class contains at least one pure virtual function in C++?

It cannot have constructors

It does not support polymorphism

It becomes an abstract class

It can be instantiated normally

Question 26

What is the default behavior if a base class pointer points to a derived class object but does not use virtual functions in C++?

The derived class method is called

Runtime error

Compilation error

The base class method is called

Question 27

What will happen if a C++ derived class does not override a virtual function of the base class?

Compilation error

Undefined behavior

The program crashes

The base class function is called

Runtime Error

Question 28

Which statement is true about interfaces and abstract classes?

Interfaces can have constructors

Abstract classes cannot have concrete methods

Interfaces cannot be implemented by multiple classes

An abstract class can have both abstract and concrete methods

Question 29

Which principle of OOP is illustrated by defining different methods with the same name but different parameters?

Inheritance

Abstraction

Encapsulation

Polymorphism

Question 30

Which concept in OOP allows for the same function to be used in different ways based on the object it is associated with?

Encapsulation

Polymorphism

Abstraction

Inheritance