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C++ MCQ

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C++ MCQ With Answers

Following are mostly asked C++ MCQ test that are designed for professionals like you to crack you interviews. You can take this C++ online test before appearing to you real interview. This C++ quiz there are around 30+ multiple choice questions on C++ with four options.

1) Which operator has highest precedence in * / % ?

A. /
B. *
C. %
D. all have same precedence

2) How to access and edit data in data file handling using structures

A. read()
B. write()
C. both A and B

D. without read()

3) Can we overload functions in C++?

A. Yes

B. No
C. Compilation Error
D. Runtime Error

4) Which of the followings is/are automatically added to every class, if we do not write our own.

A. Copy Constructor
B. Assignment Operator
C. A constructor without any parameter
D. All are Correct

5) Implicit return type of a class constructor is:

A. not of class type itsel
B. class type itself

C. a destructor of class type
D. a destructor not of class type

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6) Choose the respective delete operator usage for the expression 'ptr=new int[100]'.

A. []delete ptr;
B. delete[] ptr;

C. delete ptr[];
D. delete ptr;

7) How many number of arguments can a destructor of a class receives?

A. 0

B. 1
C. 2
D. None of the above.

8) Which of the following is FALSE about references in C++

A. References cannot be NULL
B. A reference must be initialized when declared
C. Once a reference is created, it cannot be later made to reference another object; it cannot be reset.
D. References cannot refer to constant value

9) Which of the following is not correct for virtual function in C++ ?

A. Must be declared in public section of class.
B. Virtual function can be static.

C. Virtual function should be accessed using pointers.
D. Virtual function is defined in base class.

10) Which of the following cannot be passed to a function in C++ ?

A. Constant
B. Structure
C. Array
D. Header file

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11) The associativity of which of the following operators is Left to Right, in C++ ?

A. Unary Operator
B. Logical not
C. Array element access

D. addressof

12) How many elements does a floating point number is composed of?

A. 1
B. 2
C. 3
D. 4

13) How many types of sequence operations are provided by the C++ algorithm STL?

A. 1
B. 2

C. 3
D. 4

14) Can destructors be virtual in C++?

A. Yes

B. No

15) How many kinds of classes are there in c++?

A. 1
B. 2

C. 3
D. 4

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16) How can we restrict dynamic allocation of objects of a class using new?

A. By overloading new operator
B. By making an empty private new operator.
C. By making an empty private new and new[] operators

D. By overloading new operator and new[] operators

17) What id the syntax for catching any type of exceptions

A. catch(Exception e)
B. catch(...)

C. catch(Exception ALL)
D. catch(ALL)

18) Which of the following is true about this pointer?

A. It is passed as a hidden argument to all function calls
B. It is passed as a hidden argument to all non-static function calls

C. It is passed as a hidden argument to all static functions
D. None of the above

19) Which of the following in Object Oriented Programming is supported by Function overloading and default arguments features of C++.

A. Inheritance
B. Polymorphism

C. Encapsulation
D. None of the above

20) Which of the following is true?

A. Static methods cannot be overloaded.
B. Static data members can only be accessed by static methods.
C. Non-static data members can be accessed by static methods.
D. Static methods can only access static members (data and methods)

21) How many types of linkages are there in C++?

A. 1
B. 2
C. 3

D. 4

22) Which of the following concepts is used to implement late binding?

A. Virtual function

B. Operator function
C. Const function
D. Static function

23) Which of the following ways are legal to access a class data member using this pointer?

A. this->x

B. this.x
C. *this.x
D. *this-x

24) In C++, const qualifier can be applied to 1) Member functions of a class 2) Function arguments 3) To a class data member which is declared as static 4) Reference variables

A. Only 1, 2 and 3
B. Only 1, 2 and 4
C. Only 1, 3 and 4
D. All

25) How to create a dynamic array of pointers (to integers) of size 10 using new in C++?

A. int *arr = new int *[10];
B. int **arr = new int *[10];

C. int *arr = new int [10];
D. Not Possible

26) Which of the following is true about virtual functions in C++.

A. Virtual functions are functions that can be overridden in derived class with the same signature.
B. Virtual functions enable run-time polymorphism in a inheritance hierarchy.
C. If a function is 'virtual' in the base class, the most-derived class's 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.
D. All are Correct

27) Which of the following provides the best description of an entity type?

A. A specific concrete object with a defined set of processes (e.g. Jatin with diabetes)
B. A value given to a particular attribute (e.g. height - 230 cm)
C. A thing that we wish to collect data about zero or more, possibly real world examples of it may exist
D. A template for a group of things with the same set of characteristics that may exist in the real world