BPSC Tre 4.0 C++ MCQ Practice set Computer teacher 2025
Here are 50 important C++ multiple-choice questions (MCQs) along with their answers:
-
Which of the following is the correct syntax to include a header file in C++?
- a) #include "headerfile"
- b) include
- c) #include
- d) #include [headerfile]
Answer: c) #include
-
Which of the following operators cannot be overloaded in C++?
- a) +
- b) /
- c) ::
- d) -
Answer: c) ::
-
Which of the following is the default access modifier for class members in C++?
- a) public
- b) private
- c) protected
- d) none of the above
Answer: b) private
-
Which of the following is a correct example of a pointer in C++?
- a) int *ptr;
- b) ptr = &x;
- c) *ptr = 5;
- d) All of the above
Answer: d) All of the above
-
What will be the output of the following code?
int x = 10; cout << ++x;- a) 10
- b) 11
- c) Error
- d) None of the above
Answer: b) 11
-
Which of the following is a function that does not return any value?
- a) void function()
- b) int function()
- c) float function()
- d) None of the above
Answer: a) void function()
-
Which of the following is true about constructors in C++?
- a) Constructors are used to initialize objects.
- b) Constructors must have the same name as the class.
- c) Constructors do not have a return type.
- d) All of the above
Answer: d) All of the above
-
What is the output of the following code?
int x = 5; cout << (x++);- a) 5
- b) 6
- c) Error
- d) None of the above
Answer: a) 5
-
Which of the following is used to allocate memory dynamically in C++?
- a) malloc()
- b) new
- c) calloc()
- d) free()
Answer: b) new
-
Which of the following is the correct way to declare a constant variable in C++?
- a) const int x = 10;
- b) int const x = 10;
- c) Both a and b
- d) None of the above
Answer: c) Both a and b
-
Which of the following statements is correct about the destructors in C++?
- a) Destructor is used to initialize objects.
- b) Destructor has the same name as the class.
- c) Destructor must return a value.
- d) Destructor cannot be overloaded.
Answer: b) Destructor has the same name as the class.
-
Which of the following is used for type conversion in C++?
- a) cast()
- b) (type)expression
- c) type_cast()
- d) None of the above
Answer: b) (type)expression
-
What is the output of the following code?
int a = 10; int b = 20; cout << a + b;- a) 10
- b) 20
- c) 30
- d) Error
Answer: c) 30
-
Which of the following is the correct syntax for a while loop in C++?
- a) while (condition) { // statements }
- b) do { // statements } while (condition);
- c) for (int i = 0; i < 10; i++) { // statements }
- d) All of the above
Answer: a) while (condition) { // statements }
-
Which of the following is a valid C++ data type?
- a) integer
- b) int
- c) float32
- d) double64
Answer: b) int
-
What will be the output of the following code?
int x = 5; cout << --x;- a) 4
- b) 5
- c) 6
- d) Error
Answer: a) 4
-
Which of the following statements is used to terminate a loop in C++?
- a) exit()
- b) break
- c) continue
- d) return
Answer: b) break
-
Which of the following types of inheritance is not allowed in C++?
- a) Single inheritance
- b) Multiple inheritance
- c) Multilevel inheritance
- d) Cyclic inheritance
Answer: d) Cyclic inheritance
-
Which of the following C++ concepts allows the same function name to be used for different functions with different signatures?
- a) Inheritance
- b) Polymorphism
- c) Encapsulation
- d) Overloading
Answer: d) Overloading
-
Which of the following will be used to access the class member from outside the class in C++?
- a) dot operator
- b) scope resolution operator
- c) arrow operator
- d) pointer operator
Answer: a) dot operator
-
Which of the following operators is used to allocate memory dynamically in C++?
- a) malloc
- b) new
- c) delete
- d) free
Answer: b) new
-
Which of the following is the correct syntax for a switch statement in C++?
- a) switch(expression) { case value: // code }
- b) switch(expression) { case: value; }
- c) switch (value) { case expression: // code }
- d) switch(expression) { default: }
Answer: a) switch(expression) { case value: // code }
-
What does the term "inheritance" in C++ mean?
- a) The ability to take on the attributes and behavior of another class.
- b) The ability to override a method of a base class.
- c) The ability to call a method from another class.
- d) None of the above.
Answer: a) The ability to take on the attributes and behavior of another class.
-
Which of the following access modifiers restricts access to members of a class to the members of the same class only?
- a) public
- b) private
- c) protected
- d) friend
Answer: b) private
-
Which of the following is used to stop the execution of a loop immediately in C++?
- a) break
- b) exit
- c) continue
- d) return
Answer: a) break
-
Which of the following is used to define a constant in C++?
- a) const
- b) final
- c) constant
- d) define
Answer: a) const
-
Which of the following is the correct way to declare a reference in C++?
- a) int &x;
- b) int x&;
- c) ref int x;
- d) None of the above
Answer: a) int &x;
-
Which function in C++ is called when an object goes out of scope?
- a) Destructor
- b) Constructor
- c) Finalizer
- d) Destructor and Constructor
Answer: a) Destructor
-
Which of the following C++ keywords is used to define a function that will never return a value?
- a) void
- b) null
- c) empty
- d) None of the above
Answer: a) void
-
What is the function of the 'new' keyword in C++?
- a) It creates a new instance of a class.
- b) It allocates memory for an object dynamically.
- c) It initializes a class.
- d) None of the above.
Answer: b) It allocates memory for an object dynamically.
-
What is the correct way to declare a 2D array in C++?
- a) int arr[3][4];
- b) int arr(3, 4);
- c) int arr[3, 4];
- d) int arr{3}{4};
Answer: a) int arr[3][4];
-
Which of the following operators is used to access members of a class through a pointer to an object in C++?
- a) dot operator (.)
- b) arrow operator (->)
- c) scope resolution operator (::)
- d) None of the above
Answer: b) arrow operator (->)
-
Which of the following is a valid pointer declaration in C++?
- a) int *p;
- b) *int p;
- c) p* int;
- d) None of the above
*Answer: a) int p;
-
What is a pure virtual function in C++?
- a) A function that has no implementation.
- b) A function that is overridden in derived classes.
- c) A function that can only be accessed by the derived class.
- d) None of the above
Answer: a) A function that has no implementation.
-
Which of the following C++ features supports function overloading?
- a) Polymorphism
- b) Encapsulation
- c) Inheritance
- d) Abstraction
Answer: a) Polymorphism
-
What is the result of the expression
10 / 3in C++?- a) 3.33
- b) 3
- c) 4
- d) Error
Answer: b) 3
-
What will the following code output?
int x = 2; x *= 3; cout << x;- a) 6
- b) 2
- c) 3
- d) Error
Answer: a) 6
-
Which of the following is the correct declaration for an inline function in C++?
- a) inline void function();
- b) function inline void();
- c) void function inline();
- d) None of the above
Answer: a) inline void function();
-
Which of the following is a characteristic of C++?
- a) Object-Oriented Programming
- b) Procedural Programming
- c) Both a and b
- d) None of the above
Answer: c) Both a and b
-
Which of the following is used to allocate memory for a single object dynamically in C++?
- a) new
- b) malloc
- c) calloc
- d) None of the above
Answer: a) new
-
What is the size of a pointer variable in C++?
- a) 1 byte
- b) 2 bytes
- c) 4 bytes
- d) Depends on the system
Answer: d) Depends on the system
-
Which of the following is the correct method for declaring a function pointer in C++?
- a) int (*ptr)();
- b) void ptr*();
- c) int ptr(*);
- d) None of the above
*Answer: a) int (ptr)();
-
Which of the following is an example of a dynamic data structure?
- a) Array
- b) Linked List
- c) Stack
- d) None of the above
Answer: b) Linked List
-
What does the 'this' pointer refer to in C++?
- a) It refers to the address of the current object.
- b) It refers to the base class.
- c) It is used for dynamic memory allocation.
- d) None of the above
Answer: a) It refers to the address of the current object.
-
What will be the output of the following code?
int a = 5; int b = 2; cout << a / b;- a) 2
- b) 2.5
- c) 5
- d) Error
Answer: a) 2
-
Which of the following is a method of a class in C++?
- a) Function
- b) Constructor
- c) Destructor
- d) All of the above
Answer: d) All of the above
-
Which of the following can be used to handle exceptions in C++?
- a) try-catch blocks
- b) throw
- c) catch
- d) All of the above
Answer: d) All of the above
-
Which of the following is an example of a virtual function in C++?
- a) void display() virtual;
- b) virtual void display();
- c) display() virtual void;
- d) None of the above
Answer: b) virtual void display();
-
Which of the following C++ features allows data hiding?
- a) Encapsulation
- b) Polymorphism
- c) Inheritance
- d) Abstraction
Answer: a) Encapsulation
-
What is the output of the following code?
int a = 10; int b = 5; cout << a % b;- a) 2
- b) 5
- c) 10
- d) 0
Answer: d) 0
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