Object Oriented Programming in C++

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Question 1

Which of the following best describes a constructor in C++?

A
A function that is called when an object is destroyed
B
A function that is called when an object is accessed
C
A function that is called when an object is created
D
A function that is called when an object is inherited

Question 2

Which OOP concept in C# is used to restrict direct access to data and allow it only through methods?

A
Encapsulation
B
Abstraction
C
Data hiding
D
Data binding

Question 3

What is the main benefit of encapsulation in C++?

A
Faster execution
B
Better UI design
C
Data security and abstraction
D
Simplified syntax

Question 4

Which of the following best describes abstraction?

A
Hiding implementation details and showing only relevant information to the users.
B
Binding both data members and member functions into a single unit.
C
Accessing data members and member functions of one class by other
D
All of the above

Question 5

Which access specifier provides the highest level of protection?

A
private
B
protected
C
public
D
None of the above

Question 6

Which of the following correctly defines function overloading and function overriding in C++?

A
Overloading occurs when two or more methods in the same class have the same name but different parameters overriding occurs when a derived class has a definition for one of the member functions of the base class.
B
Overloading occurs in the same class, overriding occurs between a base class and a derived class
C
Overloading requires the use of the 'virtual' keyword, overriding does not.
D
Overloading and overriding are the same in C++.

Question 7

What will be the output of the following program?

C++

#include<iostream>
using namespace std;

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

A
Base
B
Derived
C
Compilation error
D
Runtime error

Question 8

#include <iostream>
using namespace std;

class Player
{
private:
    int id;
    static int next_id;
public:
    int getID() { return id; }
    Player()  {  id = next_id++; }
};
int Player::next_id = 1;

int main()
{
  Player p1;
  Player p2;
  Player p3;
  cout << p1.getID() << " ";
  cout << p2.getID() << " ";
  cout << p3.getID();
  return 0;
}

A
Compiler Error
B
1 2 3
C
1 1 1
D
3 3 3
E
0 0 0

Question 9

Which access specifier is commonly used to hide data in abstraction?

A
Public
B
Private
C
Protected
D
Any of these

Question 10

Which of the following operators should be preferred to overload as a global function rather than a member method?

A
Postfix ++
B
Comparison Operator
C
Insertion Operator <<
D
Prefix++

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