MCQ On Class and Object in C++: Multiple Choice Questions and Answers on Class and Object in C++

MCQ on class and object in C++ with answers and explanations for placement tests and job interviews. This C++ MCQ on class and object is useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

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Guideline of MCQ on class and object in C++:

This MCQ on class and object in C++ is intended for checking your knowledge of C++ class and object. It takes 30 minutes to pass the C++ quiz on class and object. If you don’t finish the C++ class and object quiz within the mentioned time, all the unanswered questions will count as wrong. Every unanswered question will count as wrong. Quiz on class and object in C++ has randomization features that give you a new question set at every attempt.

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C++ MCQ On Class and Object

C++ MCQ On Class and Object

C++ MCQ On Class and Object: Multiple Choice Questions and Answers on C++ Class and Object

1 / 17

Assume that an integer and a pointer each takes 4 bytes. Also, assume that there is no alignment in objects. Predict the output following program.

#include<iostream>
using namespace std;
 
class Test
{
    static int x;
    int *ptr;
    int y;
};
 
int main()
{
    Test t;
    cout << sizeof(t) << " ";
    cout << sizeof(Test *);
}

12 4

12 12

8 4

8 8

2 / 17

Which of the following is true about the following program

#include <iostream>
class Test
{
public:
    int i;
    void get();
};
void Test::get()
{
    std::cout << "Enter the value of i: ";
    std::cin >> i;
}
Test t;  // Global object
int main()
{
    Test t;  // local object
    t.get();
    std::cout << "value of i in local t: "<<t.i<<'n';
    ::t.get(); 
    std::cout << "value of i in global t: "<<::t.i<<'n';
    return 0;
}

Compiler Error: Cannot have two objects with same class name

Compiler Error in Line "::t.get();"

Compiles and runs fine

3 / 17

Predict the output of following C++ program

#include<iostream>
using namespace std;
  
class Empty {};
  
int main()
{
  cout << sizeof(Empty);
  return 0;
}

A non-zero value

Compiler Error

Runtime Error

4 / 17

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

Must be declared in public section of class.

Virtual function can be static.

Virtual function should be accessed using pointers.

Virtual function is defined in base class.

5 / 17

When one object reference variable is assigned to another object reference variable then

a copy of the object is created.

a copy of the reference is created.

a copy of the reference is not created.

it is illegal to assign one object reference variable to another object reference variable.

6 / 17

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

Constant

Structure

Array

Header file

7 / 17

What is the difference between struct and class in C++?

All members of a structure are public and structures don't have constructors and destructors

Members of a class are private by default and members of struct are public by default. When deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private.

All members of a structure are public and structures don't have virtual functions

All of the above

8 / 17

Which of the following is a correct statement?

Composition is a strong type of association between two classes with full ownership.

Composition is a strong type of association between two classes with partial ownership.

Composition is a weak type of association between two classes with partial ownership.

Composition is a weak type of association between two classes with strong ownership.

9 / 17

Which of the following is not a correct statement?

Every class containing abstract method must be declared abstract.

Abstract class can directly be initiated with ‘new’ operator.

Abstract class can be initiated.

Abstract class does not contain any definition of implementation.

10 / 17

class Test {
int x;
};
int main()
{
Test t;
cout << t.x;
return 0;
}

Garbage Value

Compiler Error

11 / 17

Which of the following is not a member of class?

Static function

Friend function

Const function

Virtual function

12 / 17

Which of the following is true?

All objects of a class share all data members of class

Objects of a class do not share non-static members. Every object has its own copy.

Objects of a class do not share codes of non-static methods, they have their own copy

None of the above

13 / 17

It is possible to define a class within a class termed as nested class. There are _____ types of nested classes.

14 / 17

Which of the following, in C++, is inherited in a derived class from base class ?

constructor

destructor

data members

virtual methods

15 / 17

A member function can always access the data in __________ , (in C++).

the class of which it is member

the object of which it is a member

the public part of its class

the private part of its class

16 / 17

When a method in a subclass has the same name and type signatures as a method in the superclass, then the method in the subclass _____ the method in the superclass.

Overloads

Friendships

Inherits

Overrides

17 / 17

Which of the following is not correct (in C++) ?

Class templates and function templates are instantiated in the same way.
Class templates differ from function templates in the way they are initiated.
Class template is initiated by defining an object using the template argument.
Class templates are generally used for storage classes.

(1)

(2), (4)

(2), (3), (4)

(4)

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MCQ On Class and Object in C++: Multiple Choice Questions and Answers on Class and Object in C++

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