Classes And Objects In C Plus Plus — Part 1 MCQs with Explanations

Access specifiers in C++ determine the visibility and accessibility of class members. The protected access specifier allows members of a class to be accessed by: 1. Member functions of the same class 2. Member functions of its derived (child) classes This makes protected different from private , which restricts access only to the class itself, and from public , which allows access from anywhere. Now let’s see why the other options are incorrect: Option B: public — Members are accessible from anywhere in the program , which is more permissive than required by the question. Option C: private — Members are accessible only within the same class , not by derived classes, so this is too restrictive. Option D: friend — friend is not an access specifier; it is a keyword used to allow a specific external function or class to access private or protected members of another class. It doesn’t define a general access level. Conclusion: The protected access specifier is the one that allows class members to be accessed within the same class and its derived classes. Hence, the correct answer is Option A: protected .

A blueprint for creating objects is the correct answer to “What is a class in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

None of the above is the correct answer to “Which keyword is used to create an object of a class in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

An instance of a class is the correct answer to “What is an object in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

To initialize the object's data members is the correct answer to “What is the purpose of a constructor in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

public is the correct answer to “Which access specifier allows members of a class to be accessed from outside the class in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

returnType className::functionName() {} is the correct answer to “What is the correct syntax to define a member function outside the class in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Encapsulation is the correct answer to “What is the process of combining data and functions into a single unit called in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Pointer to the current object instance is the correct answer to “What does the 'this' pointer refer to in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

const is the correct answer to “Which keyword is used to declare a member function of a class as constant in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

To create a single copy of the member shared by all objects is the correct answer to “What is the purpose of the 'static' keyword in C++ class members”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Destructor is the correct answer to “Which type of function is used to destroy objects in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Dot operator (.) is the correct answer to “Which operator is used to access members of an object in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Constructor is called when an object is created, while destructor is called when an object is destroyed is the correct answer to “What is the difference between a constructor and a destructor in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

To release resources acquired by the object is the correct answer to “What is the purpose of the destructor in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

class is the correct answer to “Which keyword is used to declare a class in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

To maintain common data for all objects is the correct answer to “What is the purpose of the static member variable in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

To allow access to private and protected members of a class from outside the class is the correct answer to “What is the purpose of using friend functions in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

protected is the correct answer to “Which access specifier allows members of a class to be accessed only by the derived classes in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Member function is the correct answer to “What is the term for a function that is declared inside a class but defined outside of it in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

To initialize the object's data members is the correct answer to “What is the purpose of using constructors in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

None of the above is the correct answer to “Which keyword is used to create a copy constructor in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

To initialize an object using another object is the correct answer to “What is the purpose of a copy constructor in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

A special member function that destroys objects is the correct answer to “What is a destructor in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

const is the correct answer to “Which keyword is used to make a member function constant in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

To prevent implicit conversions during object initialization is the correct answer to “What is the purpose of the keyword 'explicit' before a constructor in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

2 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <complex> using namespace std; int main () { complex<double> mycomplex (20.0, 2.0); cout << imag(mycomplex) << endl; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

0 is the correct answer to “How many parameters does a conversion operator may take”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

operator+ operator+= is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class Integer { int i; public: Integer(int ii) : i(ii) {} const Integer operator+(const Integer& rv) const { cout << "operator+" << endl; return Integer(i + rv.i); } Integer& operator+=(const Integer& rv) { cout << "operator+=" << endl; i += rv.i; return *this; } }; int main() { int i = 1, j = 2, k = 3; k += i + j; Integer ii(1), jj(2), kk(3); kk += ii + jj; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

?: is the correct answer to “Which of the following operator cannot be overloaded”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Macros looks like function calls but they are actually not is the correct answer to “Pick the correct statement.”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

:: is the correct answer to “Which is used to define the member of a class externally”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

error is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; ostream & operator<<(ostream & i, int n) { return i; } int main() { cout << 5 << endl; cin.get(); return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Error is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; class Box{ int capacity; bool operator<(Box b){ return this->capacity < b.capacity ? true : false; } public: Box(){} Box(double capacity){ this->capacity = capacity; } }; int main(int argc, char const *argv[]) { Box b1(10); Box b2 = Box(14); if(b1 < b2){ cout<<"Box 2 has large capacity."; } else{ cout<<"Box 1 has large capacity."; } return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

-> is the correct answer to “Which operator a pointer object of a class uses to access its data members and member functions”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

a:4 b:7 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; int main () { int a, b; a = 10; b = 4; a = b; b = 7; cout << "a:"; cout << a; cout << " b:"; cout << b; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Example! is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; int main () { std::string str ("Example."); str.back() = '!'; std::cout << str << endl; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

— is the correct answer to “Which is the correct example of a unary operator”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

1 is the correct answer to “In case of non-static member functions how many maximum object arguments a binary operator overloaded function can take”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

== is the correct answer to “Which of the following operator can be overloaded”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.