Question 1
What is inheritance in Object-Oriented Programming (OOP)?
1
The mechanism of wrapping data and methods into a single unit
2
The ability of one class to derive properties and behaviors from another class
3
The ability to define multiple methods with the same name
4
The process of restricting access to data members
Question 2
What is multilevel inheritance?
1
When multiple classes inherit a single base class
2
When a class does not inherit anything
3
When a class inherits from a derived class
4
When a class inherits multiple classes
Question 3
Which of the following statements is true about constructors in inheritance?
1
Constructors are not inherited in OOP
2
A derived class constructor can call only its own constructor
3
A derived class constructor automatically calls the base class constructor
4
A base class constructor is never called when an object of the derived class is created
Question 4
What is the keyword used to inherit a class in C#?
1
inherits
2
implements
3
: (colon)
4
extends
Question 5
Which keyword is used to prevent a class from being inherited?
1
static
2
private
3
abstract
4
sealed
Question 6
Which of the following correctly implements an interface in C#?
1
interface ITest { void Show(); }
class MyClass : ITest { protected void Show() { Console.WriteLine("Hello"); } }2
interface ITest { void Show(); }
class MyClass : ITest { void Show() { Console.WriteLine("Hello"); } }3
interface ITest { void Show(); }
class MyClass : ITest { public void Show() { Console.WriteLine("Hello"); } }4
interface ITest { void Show(); }
class MyClass { public void Show() { Console.WriteLine("Hello"); } }Question 7
What type of inheritance is not supported in C#?
1
Hierarchical Inheritance
2
Multilevel Inheritance
3
Multiple Inheritance
4
Single Inheritance
Question 8
What is the output of the following code?
#include <iostream>
using namespace std;
class A {
public:
A() { cout << "A "; }
};
class B : public A {
public:
B() { cout << "B "; }
};
int main() {
B obj;
return 0;
}1
B A
2
A B
3
Runtime Error
4
Compilation error
Question 9
In C++, which type of inheritance allows all members of the base class to become private in the derived class?
1
Public Inheritance
2
Protected Inheritance
3
Private Inheritance
4
Multilevel Inheritance
Question 10
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 11
What happens if a class contains at least one pure virtual function in C++?
1
It does not support polymorphism
2
It cannot have constructors
3
It can be instantiated normally
4
It becomes an abstract class
Question 12
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
Runtime error
2
The derived class method is called
3
Compilation error
4
The base class method is called
Question 13
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
Compilation error
3
The program crashes
4
Runtime Error
5
Undefined behavior
Question 14
Which statement is true about interfaces and abstract classes?
1
Interfaces can have constructors
2
Abstract classes cannot have concrete methods
3
Interfaces cannot be implemented by multiple classes
4
An abstract class can have both abstract and concrete methods
Question 15
Which of the following statements about interfaces in Java is true?
1
An interface can have final methods
2
A class can implement only one interface
3
An interface can have constructors
4
An interface supports multiple inheritance