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This set of CPP Programming Multiple Choice Questions & Answers (MCQs) focuses on Cpp Programming Set 2

Q1 | Which of the following is not a member of class?
  • Static function
  • Friend function
  • Const function
  • Virtual function
Q2 | How can we restrict dynamic allocation of objects of a class using new?
  • By overloading new operator
  • By making an empty private new operator.
  • By making an empty private new and new[] operators
  • By overloading new operator and new[] operators
Q3 | Which of the following operators cannot be overloaded?
  • . (Member Access or Dot operator)
  • ?: (Ternary or Conditional Operator)
  • :: (Scope Resolution Operator)
  • All of the above
Q4 | Which of the following operators are overloaded by default by the compiler in every user defined classes even if user has not written? 1) Comparison Operator (==) 2) Assignment Operator (=)
  • Both 1 and 2
  • Only 1
  • Only 2
  • None of the two
Q5 | Which of the following operators should be preferred to overload as a global function rather than a member method?
  • Postfix ++
  • Comparison Operator
  • Insertion Operator <<
  • Prefix++
Q6 | How C++ compiler does differ between overloaded postfix and prefix operators?
  • C++ doesn’t allow both operators to be overloaded in a class
  • A postfix ++ has a dummy parameter
  • A prefix ++ has a dummy parameter
  • By making prefix ++ as a global function and postfix as a member function.
Q7 | Which of the following operator functions cannot be global?
  • new
  • delete
  • Conversion Operator
  • All of the above
Q8 | Which of the following is true about this pointer?
  • It is passed as a hidden argument to all function calls
  • It is passed as a hidden argument to all non-static function calls
  • It is passed as a hidden argument to all static functions
  • None of the above
Q9 | What is the use of this pointer?
  • When local variable’s name is same as member’s name, we can access member using this pointer.
  • To return reference to the calling object
  • Can be used for chained function calls on an object
  • All of the above
Q10 | Which of the following in Object Oriented Programming is supported by Function overloading and default arguments features of C++?
  • Inheritance
  • Polymorphism
  • Encapsulation
  • None of the above
Q11 | Output of the program?#includeusing namespace std;int fun(int x = 0, int y = 0, int z){ return (x + y + z); }int main(){cout << fun(10);return 0;}
  • 10
  • 0
  • 20
  • Compiler Error
Q12 | Output of following program?#include using namespace std;int fun(int=0, int = 0);int main(){cout << fun(5);return 0;}int fun(int x, int y){return (x+y);}
  • Compiler Error
  • 5
  • 10
Q13 | Which of the following is true?
  • Static methods cannot be overloaded.
  • Static data members can only be accessed by static methods.
  • Non-static data members can be accessed by static methods.
  • Static methods can only access static members (data and methods)
Q14 | If a function is friend of a class, which one of the following is wrong?
  • A function can only be declared a friend by a class itself.
  • Friend functions are not members of a class, they are associated with it.
  • Friend functions are members of a class.
  • It can have access to all members of the class, even private ones.
Q15 | Which one of the following is correct, when a class grants friend status to another class?
  • The member functions of the class generating friendship can access the members of the friend class.
  • All member functions of the class granted friendship have unrestricted access to the members of the class granting the friendship.
  • Class friendship is reciprocal to each other.
  • There is no such concept.
Q16 | In C++, const qualifier can be applied to1) Member functions of a class2) Function arguments3) To a class data member which is declared as static4) Reference variables
  • Only 1, 2 and 3
  • Only 1, 2 and 4
  • All
  • Only 1, 3 and 4
Q17 | How to create a dynamic array of pointers (to integers) of size 10 using new in C++?Hint: We can create a non-dynamic array using int *arr[10]
  • int *arr = new int *[10];
  • int **arr = new int *[10];
  • int *arr = new int [10];
  • Not Possible
Q18 | Which of the following is true about new when compared with malloc:1) new is an operator, malloc is a function2) new calls constructor, malloc doesn’t3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.
  • 1 and 3
  • 2 and 3
  • 1 and 2
  • All 1, 2 and 3
Q19 | Predict the output?#include using namespace std;class Test{int x;Test(){x = 5;} };int main(){Test *t = new Test;cout << t->x;}
  • Compiler Error
  • 5
  • Garbage Value
Q20 | Is it fine to call delete twice for a pointer?#includeusing namespace std;int main(){int *ptr = new int;delete ptr;delete ptr;return 0;}
  • Yes
  • No
  • none
  • all
Q21 | When the inheritance is private, the private methods in base class are __________ in thederived class (in C++).
  • inaccessible
  • accessible
  • protected
  • public
Q22 | What happens when delete is used for a NULL pointer?int *ptr = NULL;delete ptr;
  • Compiler Error
  • Run-time Crash
  • No Error
  • None
Q23 | Which of the following is true about virtual functions in C++?
  • Virtual functions are functions that can be overridden in derived class with the same signature.
  • Virtual functions enable run-time polymorphism in a inheritance hierarchy.
  • If a function is ‘virtual’ in the base class, the most-derived class implementation of the function is called according to the actual type of the object referred to, regardless of the declared type of the pointer or reference. In non-virtual functions, the functions are called according to the type of reference or pointer.
  • All of the above
Q24 | Which of the following is true about pure virtual functions?1) Their implementation is not provided in a class where they are declared.2) If a class has a pure virtual function, then the class becomes abstract class and aninstance of this class cannot be created.
  • Both 1 and 2
  • Only 1
  • Only 2
  • Neither 1 nor 2
Q25 | What is the size of wchar_t in C++?
  • 2
  • 4
  • 2 or 4
  • Based on the number of bits in the system