Object Oriented Programming in C++ MCQ question and answer with solution

41

What is the default access specifier for members of a class in C++?

A) friend B) protected C) private D) public

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Answer & Solution

Answer: Option C

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42

Which keyword is used to make a class inheritable by other classes in C++?

A) virtual B) inheritable C) extends D) base

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Answer & Solution

Answer: Option C

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43

What is the purpose of destructors in C++?

A) To initialize objects of a class B) To define objects within a class C) To perform calculations with object data D) To release resources acquired by the object

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Answer & Solution

Answer: Option D

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44

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

#include<iostream> 
using namespace std; 
class Base { 
public: 
	Base()	 
	{ cout<<"Constructing Base \n"; } 
	virtual~Base() 
	{ cout<<"Destructing Base \n"; }	 
}; 
class Derived: public Base { 
public: 
	Derived()	 
	{ cout<<"Constructing Derived \n"; } 
	~Derived() 
	{ cout<<"Destructing Derived \n"; } 
}; 
 
int main(void) 
{ 
	Derived *d = new Derived(); 
	Base *b = d; 
	delete b; 
	return 0; 
}

A) Constructing Base
Constructing Derived
Destructing Base B) Constructing Base
Constructing Derived
Destructing Derived
Destructing Base C) Constructing Base
Constructing Derived
Destructing Base
Destructing Derived D) Constructing Derived
Constructing Base
Destructing Base
Destructing Derived

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Answer & Solution

Answer: Option B

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45

Which concept allows you to reuse the written code?

A) Encapsulation B) Abstraction C) Inheritance D) Polymorphism

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Answer & Solution

Answer: Option C

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46

What is virtual inheritance?

A) C++ technique to avoid multiple copies of the base class into children/derived class B) C++ technique to avoid multiple inheritances of classes C) C++ technique to enhance multiple inheritance D) C++ technique to ensure that a private member of the base class can be accessed somehow

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Answer & Solution

Answer: Option A

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47

How structures and classes in C++ differ?

A) In Structures, members are public by default whereas, in Classes, they are private by default B) In Structures, members are private by default whereas, in Classes, they are public by default C) Structures by default hide every member whereas classes do not D) Structures cannot have private members whereas classes can have

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Answer & Solution

Answer: Option A

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48

Which of the following class allows to declare only one object of it?

A) Abstract class B) Virtual class C) Singleton class D) Friend class

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Answer & Solution

Answer: Option C

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49

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

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Answer & Solution

Answer: Option D

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50

How run-time polymorphisms are implemented in C++?

A) Using Inheritance B) Using Virtual functions C) Using Templates D) Using Inheritance and Virtual functions

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Answer & Solution

Answer: Option D

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Object Oriented Programming in C++ MCQ question and answer with solution | C++ Programimg MCQs