C++ Programming MCQ Test 2

1. Which of the following is correct?

a) Base class pointer object cannot point to a derived class object
b) Derived class pointer object cannot point to a base class object
c) A derived class cannot have pointer objects
d) A base class cannot have pointer objects

Answer: (a)
2. Out of the following, which is not a member of the class?
a) Static function
b) Friend function
c) Constant function
d) Virtual function

Answer: (b)
3. What is the other name used for functions inside a class?
a) Member variables
b) Member functions
c) Class functions
d) Class variables

Answer: (b)
4. Which of the following cannot be a friend?
a) Function
b) Class
c) Object
d) Operator function

Answer: (c)

5. Why references are different from pointers?

a) A reference cannot be made null
b) A reference cannot be changed once initialized
c) No extra operator is needed for dereferencing of a reference
d) All of the mentioned

Answer: (d)
6. Which of the following provides a programmer with the facility of using object of a class inside other
classes?
a) Inheritance
b) Composition
c) Abstraction
d) Encapsulation

Answer: (b)
7. How many types of polymorphism are there in C++?
a) 1
b) 2
c) 3
d) 4
Answer: (b)
8. How run-time polymorphisms are implemented in C++?
a) Using Inheritance
b) Using Virtual functions
c) Using Templates
d) Using Inheritance and Virtual functions

Answer: (b)
9. How compile-time polymorphisms are implemented in C++?
a) Using Inheritance
b) Using Virtual functions
c) Using Templates
d) Using Inheritance and Virtual functions

Answer: (c)
10. Which of the following is an abstract data type?
a) int
b) float
c) class
d) string

Answer: (c)
11. Which concept means the addition of new components to a program as it runs?
a) Data hiding
b) Dynamic binding
c) Dynamic loading
d) Dynamic typing

Answer: (d)
12. Which of the following explains the overloading of functions?
a) Virtual polymorphism
b) Transient polymorphism
c) Ad-hoc polymorphism
d) Pseudo polymorphism

Answer: (a)
13. Which of the following approach is used by C++?
a) Top-down
b) Bottom-up
c) Left-right
d) Right-left

Answer: (a)

14. Which operator is overloaded for a cout object?

a) >>
b) <<
c) <
d) >

Answer: (b)
15. Which of the following cannot be used with the virtual keyword?
a) Class
b) Member functions
c) Constructors
 d) Destructors

Answer: (c)
16. Which concept is used to implement late binding?
a) Virtual functions
b) Operator functions
c) Constant functions
d) Static functions

Answer: (a)
17. Which of the following is correct?
a) C++ allows static type checking
b) C++ allows dynamic type checking.
c) C++ allows static member function to be of type const.
d) C++ allows both static and dynamic type checking

Answer: (d)
18. Which of the following supports the concept that reusability is a desirable feature of a language?
a) It reduces the testing time
b) It reduces maintenance cost
c) It decreases the compilation time
d) It reduced both testing and maintenance time

Answer: (b)
19. Which of the following is a static polymorphism mechanism?
a) Function overloading
b) Operator overloading
c) Templates
d) All of the mentioned

Answer: (a)
20. Which of the following is true?
I) All operators in C++ can be overloaded.
II) The basic meaning of an operator can be changed.
a) I only
b) II only
c) Both I and II
d) Neither I nor II

Answer: (c)
21. Which of the following is not a type of inheritance?
a) Multiple
b) Multilevel
c) Distributive
d) Hierarchical

Answer: (c)

22. What happens if a class does not have a name?

a) It will not have a constructor
b) It will not have a destructor
c) It is not allowed
d) It will neither have a constructor or destructor
 Answer: (d)

23. Which of the following statement is true?

I) In Procedural programming languages, all function calls are resolved at compile-time
II) In Object Oriented programming languages, all function calls are resolved at compile-time
a) I only
b) II only
c) Both I and II
d) Neither I nor II

Answer: (a)
24. Which members are inherited but are not accessible in any case?
a) Private
b) Public
c) Protected
d) Both private and protected

Answer: (a)
25. Which of the following is correct?
a) Friend functions can access public members of a class
b) Friend functions can access protected members of a class
c) Friend functions can access private members of a class
d) All of the mentioned

Answer: (d)
26. Which of the following is correct in C++?
a) Classes cannot have protected data members
b) Structures can have member functions
c) Class members are public by default
d) Structure members are private by default

Answer: (a)
27. Which of the following is used to make an abstract class?
a) By using virtual keyword in front of a class declaration
b) By using an abstract keyword in front of a class declaration
c) By declaring a virtual function in a class
d) By declaring a pure virtual function in a class

Answer: (d)
28. Which of the following is correct?
a) A class is an instance of its objects
b) An object is an instance of its class
c) A class is an instance of the data type that the class have
d) An object is an instance of the data type of the class

Answer: (b)
29. What is the correct syntax of declaring array of pointers of integers of size 10 in C++?
a) int arr = new int[10];
b) int **arr = new int*[10];
c) int *arr = new int[10];
d) int *arr = new int*[10];
Answer: (b)
30. 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
a) i and ii
b) ii and iii
c) i and iii
d) i, ii and iii

Answer: (d)
31. What happens if the following C++ statement is compiled and executed?

int *ptr = NULL;

delete ptr;
a) The program compiled successfully but throws an error during run-time
b) The program gives a compile-time error
c) The program is not semantically correct
d) The program is compiled and executed successfully

Answer: (a)

32. What happens if the following program is executed in C and C++?

#include<stdio.h>
int main()
{

foo();
}

int foo()
{
printf(“ Hello “);
return(0);
}

a) Error in both C and C++

b) Warning in both C and C++
c) Error in C++ but Warning in C
d) Error in C but Warning in C++

Answer: (c)
33. Which of the following type is provided by C++ but not C?
a) int
b) bool
c) float
d) double
Answer: (b)
34. Which of the following feature is not provided by C?
a) Pointers
b) Structures
c) References
d) Functions
 Answer: (c)

35. Which of the following is not a fundamental type is not present in C but present in C++?
a) int
b) float
c) bool
d) void

Answer: (c)
36. What is the size of a boolean variable in C++?
a) 1 bit
b) 1 byte
c) 4 bytes
d) 2 bytes

Answer: (a)
37. Which of the following is C++ equivalent for scanf()?
a) cin
b) cout
c) print
d) input

Answer: (a)

38. Which of the following is C++ equivalent for printf()?

a) cin
b) cout
c) print
d) input

Answer: (b)
39. Which of the following is the correct difference between cin and scanf()?
a) both are the same
b) cin is a stream object whereas scanf() is a function
c) scanf() is a stream object whereas cin is a function
d) cin is used for printing whereas scanf() is used for reading input

Answer: (a)
40. Which of the following is an exit-controlled loop?
a) for
b) while
c) do-while
d) all of the mentioned

Answer: (c)
41. Which of the following is an entry-controlled loop?
a) for
b) while
c) do-while
d) both while and for
 Answer: (d)

42. In which part of the for loop termination condition is checked?

for(I;II;III)
{IV}
a) I
b) II
c) III
d) IV

Answer: (b)
43. . What is dynamic binding?
a) The process of linking the actual code with a procedural call during run-time
b) The process of linking the actual code with a procedural call during compile-time
c) The process of linking the actual code with a procedural call at any-time
d) All of the mentioned

Answer: (a)
44. What is static binding?
a) The process of linking the actual code with a procedural call during run-time
b) The process of linking the actual code with a procedural call during compile-time
c) The process of linking the actual code with a procedural call at any-time
d) All of the mentioned

Answer: (c)
45. What is name mangling in C++?
a) The process of adding more information to a function name so that it can be distinguished from
other functions by the compiler
b) The process of making common names for all the function of C++ program for better use
c) The process of changing the names of variable
d) The process of declaring variables of different types

Answer: (a)

46. What will be the output of the following program in both C and C++?

#include<stdio.h>
int main(int argc, char const *argv[])
{
printf("%d\n", (int)sizeof('a'));
return 0;
}

a) Output in C is 1 and in C++ is 4

b) Output in C is 4 and in C++ is 1
c) Output in C is 1 and in C++ is 1
d) Output in C is 4 and in C++ is 4

Answer: (a)
47. What will be the output of the following C++ code?

#include<stdio.h>
int main(int argc, char const *argv[])
{
 char a = 'a';
printf("%d\n", (int)sizeof(a));
return 0;
}
a) Output in C is 1 and in C++ is 4
b) Output in C is 4 and in C++ is 1
c) Output in C is 1 and in C++ is 1
d) Output in C is 4 and in C++ is 4

Answer: (c)

48. Which of the following is the scope resolution operator?

a) .
b) *
c) ::
d) ~

Answer: (c)

49. What will be the output of the following C++ code?

#include<iostream>
int x = 1;
int main()
{
int x = 2;
{
int x = 3;
cout << ::x << endl;
}
return 0;
}
a) 1
b) 2
c) 3
d) 123

Answer-: (a)

50. What will be the output of the following C++ code?

#include<iostream>
class A
{
~A(){
cout<<"Destructor called\n";
}
};
int main()
{
A a;
return 0;
}
a) Destructor called
b) Nothing will be printed
c) Error
d) Segmentation fault
Answer: (b)