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

1

Which keyword is used to define a class in C++?

A) class B) struct C) typedef D) interface

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Answer & Solution

Answer: Option A

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2

What is the process of creating an instance of a class called in C++?

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

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Answer & Solution

Answer: Option D

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3

What is inheritance in C++?

A) The process of creating multiple instances of a class B) The process of hiding the implementation details of a class C) The process of deriving a new class from an existing class D) The process of defining functions within a class

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Answer & Solution

Answer: Option C

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4

What is the access specifier that allows members to be accessed from outside the class in C++?

A) protected B) public C) friend D) None of the above

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Answer & Solution

Answer: Option B

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5

Which concept in C++ allows a class to have multiple functions with the same name but different parameter lists?

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

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Answer & Solution

Answer: Option C

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6

What is encapsulation in C++?

A) The process of creating multiple instances of a class B) The process of hiding the implementation details of a class C) The process of defining functions within a class D) The bundling of data with the methods that operate on that data

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Answer & Solution

Answer: Option D

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7

Which keyword is used to inherit a class in C++?

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

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Answer & Solution

Answer: Option A

Solution:

In C++, the keyword public is used to specify public inheritance when inheriting a class.

When a class inherits another class publicly, all public members of the base class become public members of the derived class, and protected members of the base class become protected members of the derived class.

The keywords private and protected can also be used for inheritance, but they specify different levels of access control:

private inheritance: All public and protected members of the base class become private members of the derived class.

protected inheritance: All public and protected members of the base class become protected members of the derived class.

The keyword extends is used in languages like Java for inheritance, but not in C++.

Therefore, the correct answer is public.

8

What is polymorphism in C++?

A) The ability of a function to perform different tasks based on the object that it is acting upon B) The process of creating multiple instances of a class C) The process of hiding the implementation details of a class D) The process of defining functions within a class

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Answer & Solution

Answer: Option A

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9

Which of the following is true about constructors in C++?

A) They can be overloaded B) They are used to destroy objects C) They are called explicitly by the programmer D) They are automatically called when an object is created

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Answer & Solution

Answer: Option D

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10

What is the process of wrapping data and functions into a single unit called in C++?

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

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Answer & Solution

Answer: Option C

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