Question 1
What is polymorphism in Object-Oriented Programming (OOP)?
1
The process of restricting access to certain members of a class.
2
The ability to use the same function name for different functionalities.
3
The ability to inherit properties from a base class.
4
The mechanism of wrapping data and methods into a single unit.
Question 2
What are the types of polymorphism in OOP?
1
Public and Private
2
Single and Multiple
3
Static and Dynamic
4
Inheritance and Encapsulation
Question 3
Which of the following is an example of compile-time polymorphism?
1
Function Overriding
2
Function Overloading
3
Interfaces
4
Abstract Classes
Question 4
What is the difference between method overloading and method overriding?
1
Overloading happens in a subclass, overriding happens in the same class
2
Overloading requires inheritance, overriding does not
3
Overloading occurs in the same class, overriding occurs in a derived class
4
Overloading is runtime polymorphism, overriding is compile-time polymorphism
Question 5
Which statement about polymorphism is correct?
1
Polymorphism enables a function to be used for different types of objects.
2
Polymorphism allows multiple classes to have the same properties.
3
Polymorphism prevents method overriding.
4
Polymorphism is only applicable to function overloading.
Question 6
What is the key feature of runtime polymorphism?
1
Dynamic method dispatch
2
Compile-time resolution
3
Method overloading
4
No inheritance required
Question 7
Which of the following statements about function overloading and function overriding is correct?
1
Function overriding does not support dynamic binding
2
Function overloading requires inheritance, while function overriding does not
3
Function overloading is resolved at compile-time, while function overriding is resolved at runtime
4
Function overloading occurs at runtime, while function overriding occurs at compile time
Question 8
What is method overriding in Java?
1
Making a method static
2
Changing the return type of an existing method
3
Defining a method with the same name and parameters in a child class
4
Declaring a new method with the same name in the same class
Question 9
Which keyword is used in Java to prevent method overriding?
1
super
2
final
3
abstract
4
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();
}
}1
Class B
2
Compilation Error
3
Class A
4
Runtime Error
Question 11
Which of the following statements is true about operator overloading in C++?
1
It is a type of compile-time polymorphism
2
It is achieved using function overloading
3
It allows redefining how operators work for user-defined types
4
All of the above
Question 12
In C++, which keyword is used to achieve runtime polymorphism?
1
friend
2
static
3
override
4
virtual
Question 13
What is an abstract class in Java?
1
A class that cannot be instantiated
2
A class that must contain at least one abstract method
3
A class that allows method overriding
4
All of the above
Question 14
How does Java implement runtime polymorphism?
1
Function overloading
2
Dynamic method dispatch
3
Virtual function table (vtable)
4
Early binding
Question 15
What is a virtual function in C++?
1
A function that supports operator overloading
2
A function that is resolved at runtime
3
A function with no implementation
4
A function that cannot be overridden
Question 16
What is the role of the vtable in C++?
1
It stores a list of all functions in a class.
2
It prevents method overriding.
3
It speeds up compile-time polymorphism.
4
It stores pointers to virtual functions.
Question 17
Which keyword in Java is used to call the parent class method explicitly in method overriding?
1
override
2
base
3
super
4
parent
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;
}1
Derived
2
Compilation Error
3
Undefined Behavior
4
Base
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;
}1
Compilation Error
2
Undefined Behavior
3
Base
4
Derived
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;
}1
Undefined Behavior
2
Base
3
Derived
4
Error
Question 21
Which of the following is true about abstract classes in C#?
1
Interfaces and abstract classes are the same.
2
Abstract classes can be instantiated.
3
An abstract class can have concrete methods.
4
Abstract classes must have at least one abstract method.
Question 22
What happens when a base class function is declared as virtual in C++?
1
The function call is resolved at runtime using vtable
2
The function cannot be overridden in derived classes
3
The function call is resolved at compile-time
4
The function cannot have a body
Question 23
What is true about method overriding in Java?
1
Overriding methods must have the same return type and parameters
2
The return type of the overriding method can be a subclass of the return type of the overridden method
3
A method cannot be overridden if it is declared static
4
Overriding is determined at compile time
Question 24
Which keyword prevents method overriding in C#?
1
private
2
sealed
3
final
4
abstract
Question 25
What happens if a class contains at least one pure virtual function in C++?
1
It can be instantiated normally
2
It cannot have constructors
3
It does not support polymorphism
4
It becomes an abstract class
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++?
1
Compilation error
2
The base class method is called
3
Runtime error
4
The derived class method is called
Question 27
What will happen if a C++ derived class does not override a virtual function of the base class?
1
The base class function is called
2
Runtime Error
3
Compilation error
4
The program crashes
5
Undefined behavior
Question 28
Which statement is true about interfaces and abstract classes?
1
Interfaces cannot be implemented by multiple classes
2
An abstract class can have both abstract and concrete methods
3
Abstract classes cannot have concrete methods
4
Interfaces can have constructors
Question 29
Which principle of OOP is illustrated by defining different methods with the same name but different parameters?
1
Abstraction
2
Inheritance
3
Polymorphism
4
Encapsulation
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?
1
Polymorphism
2
Abstraction
3
Inheritance
4
Encapsulation