Object Oriented Programming (OOP) MCQs | Page - 9

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Mr. Dubey

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📊 Object Oriented Programming (OOP)

Q. Which of the following statements is correct for a static member function?
1. It can access only other static members of its class.
 It can be called using the class name, instead of objects

• (A) only 1 is correct
• (B) only 2 is correct
• (C) both 1 and 2 are correct
• (D) both 1 and 2 are incorrect

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✅ Correct Answer: (C) both 1 and 2 are correct

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Mr. Dubey

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📊 Object Oriented Programming (OOP)

Q. What happens when a class with parameterized constructors and having no default constructor is used in a program and we create an object that needs a zero-argument constructor?

• (A) compile-time error
• (B) preprocessing error
• (C) runtime error
• (D) runtime exception

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✅ Correct Answer: (A) compile-time error

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Mr. Dubey

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📊 Object Oriented Programming (OOP)

Q. Which of the following interface determines how your program will be used by other program?

• (A) public
• (B) private
• (C) protected
• (D) none of these

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✅ Correct Answer: (A) public

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Mr. Dubey

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📊 Object Oriented Programming (OOP)

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

• (A) all members of a structure are public and structures don't have constructors and destructors
• (B) 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.
• (C) all members of a structure are public and structures don't have virtual functions
• (D) all above

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✅ Correct Answer: (B) 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.

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Mr. Dubey

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📊 Object Oriented Programming (OOP)

Q. Predict the output of following C++ program
#include<iostream> using namespace std;
class Empty {}; int main()
{
cout <<sizeof(Empty); return 0;
}

• (A) a non zero value
• (B) 0
• (C) compile time error
• (D) runtime error

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✅ Correct Answer: (A) a non zero value

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Mr. Dubey

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📊 Object Oriented Programming (OOP)

Q. Which of the following is true?

• (A) all objects of a class share all data members of class
• (B) objects of a class do not share non-static members. every object has its own copy
• (C) objects of a class do not share codes of non-static methods, they have their own copy
• (D) none

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✅ Correct Answer: (B) objects of a class do not share non-static members. every object has its own copy

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Mr. Dubey

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📊 Object Oriented Programming (OOP)

Q. Which of the following is true about new when compared with malloc. 1) new is an operator, malloc is a function 2) new calls constructor, malloc doesn't 3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

• (A) 1 and 3
• (B) 2 and 3
• (C) 1 and 2
• (D) all 1,2,3

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✅ Correct Answer: (C) 1 and 2

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Mr. Dubey

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📊 Object Oriented Programming (OOP)

Q. Predict the output?
#include <iostream> using namespace std;
class Test
{
int x;
Test() { x = 5;}
};
int main()
{
Test *t = new Test; cout <<t->x;
}

• (A) compile time error
• (B) garbage
• (C) 0
• (D) 5

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✅ Correct Answer: (A) compile time error

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Mr. Dubey

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📊 Object Oriented Programming (OOP)

Q. Is it fine to call delete twice for a pointer?
#include<iostream> using namespace std;
int main()
{
int *ptr = new int; delete ptr;
delete ptr; return 0;
}

• (A) yes
• (B) no
• (C) ---
• (D) ---

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✅ Correct Answer: (B) no

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Mr. Dubey

🎓 Coach ⭐ 103.11K Points

📊 Object Oriented Programming (OOP)

Q. 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

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✅ Correct Answer: (D) all

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