Object Oriented Programming In C Plus Plus — Part 2 MCQs with Explanations

private is the correct answer to “What is the default access specifier for members of a class in C++”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

extends is the correct answer to “Which keyword is used to make a class inheritable by other classes in C++”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

To release resources acquired by the object is the correct answer to “What is the purpose of destructors in C++”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Constructing Base Constructing Derived Destructing Derived Destructing Base is the correct answer to “What will be the output of the following C++ code? #include<iostream> using namespace std; class Base { public: Base() { cout<<"Constructing Base \n"; } virtual~Base() { cout<<"Destructing Base \n"; } }; class Derived: public Base { public: Derived() { cout<<"Constructing Derived \n"; } ~Derived() { cout<<"Destructing Derived \n"; } }; int main(void) { Derived *d = new Derived(); Base *b = d; delete b; return 0; }”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Inheritance is the correct answer to “Which concept allows you to reuse the written code”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

C++ technique to avoid multiple copies of the base class into children/derived class is the correct answer to “What is virtual inheritance”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

In Structures, members are public by default whereas, in Classes, they are private by default is the correct answer to “How structures and classes in C++ differ”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Singleton class is the correct answer to “Which of the following class allows to declare only one object of it”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

i, ii and iii is the correct answer to “Which of the following is correct about new and malloc? i. new is an operator whereas malloc is a function ii. new calls constructor malloc does not iii. new returns required pointer whereas malloc returns void pointer and needs to be typecast”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Using Inheritance and Virtual functions is the correct answer to “How run-time polymorphisms are implemented in C++”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Friend function is the correct answer to “Out of the following, which is not a member of the class”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

int **arr = new int*[10] is the correct answer to “What is the correct syntax of declaring array of pointers of integers of size 10 in C++”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

int func(float); float func(int, int, char) is the correct answer to “Which of the following explains Polymorphism”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Polymorphism is the correct answer to “Which of the following feature of OOPs is not used in the following C++ code? class A { int i; public: void print(){cout<<"hello"<<i;} } class B: public A { int j; public: void assign(int a){j = a;} }”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

All of the mentioned is the correct answer to “Why references are different from pointers”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Ad-hoc polymorphism is the correct answer to “Which of the following explains the overloading of functions”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

delete is used to delete single object whereas delete[] is used to multiple(array/pointer of) objects is the correct answer to “What is the difference between delete and delete[] in C++”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Member functions is the correct answer to “What is the other name used for functions inside a class”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

class is the correct answer to “Which of the following is an abstract data type”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

The program is compiled and executed successfully is the correct answer to “What happens if the following C++ statement is compiled and executed? int *ptr = NULL; delete ptr;”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Compile-time error is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A { int a; A() { a = 5;} }; int main() { A *obj = new A; cout << obj->a; }”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Friend constructor is the correct answer to “Which of the following is not a type of Constructor”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Object is the correct answer to “Which of the following cannot be a friend”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

They allows us to show only required things to outer world is the correct answer to “How access specifiers in Class helps in Abstraction”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Bottom-up is the correct answer to “Which of the following approach is used by C++”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Composition is the correct answer to “Which of the following provides a programmer with the facility of using object of a class inside other classes”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Dynamic loading is the correct answer to “Which concept means the addition of new components to a program as it runs”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Concept of allowing overiding of functions is the correct answer to “What does polymorphism in OOPs mean”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Segmentation fault is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class A{ public: A(){ cout<<"Constructor called\n"; } ~A(){ cout<<"Destructor called\n"; } }; int main(int argc, char const *argv[]) { A *a = new A[5]; delete a; return 0; }”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Encapsulation is the correct answer to “Wrapping data and its related functionality into a single entity is known as . . . . . . . .”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Constructing Base Constructing Derived Destructing Base is the correct answer to “What will be the output of the following C++ code? #include<iostream> using namespace std; class Base { public: Base() { cout<<"Constructing Base \n"; } ~Base() { cout<<"Destructing Base \n"; } }; class Derived: public Base { public: Derived() { cout<<"Constructing Derived \n"; } ~Derived() { cout<<"Destructing Derived \n"; } }; int main(void) { Derived *d = new Derived(); Base *b = d; delete b; return 0; }”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

both procedural and object oriented programming language is the correct answer to “C++ is . . . . . . . .”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Using Templates is the correct answer to “How compile-time polymorphisms are implemented in C++”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Subdividing program into small independent parts is the correct answer to “What does modularity mean”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

2 is the correct answer to “How many types of polymorphism are there in C++”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

A,B->C is the correct answer to “Which of the following shows multiple inheritances”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Undefined behaviour is the correct answer to “What happens if a pointer is deleted twice in a program as shown in the following C++ statements? int *ptr = new int; delete ptr; delete ptr;”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.

Pointer object initialization of a class using new involves constructor call whereas using malloc does not involve constructor call is the correct answer to “Which of the following is correct about new and malloc”. This question is standard in competitive examination syllabi for Object Oriented Programming In C Plus Plus.