Constructors and Destructors in C++ MCQ question and answer with solution

1

What is a constructor in C++?

A) A function used to create objects B) A special member function that initializes objects C) A function used to access class members D) None of the above

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Answer & Solution

Answer: Option B

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2

Which access specifier allows constructors to be called from anywhere in the program in C++?

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

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Answer & Solution

Answer: Option C

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3

What happens if a class does not explicitly declare any constructors in C++?

A) A compilation error occurs B) The class cannot be instantiated C) The class is initialized with default values D) A default constructor is provided by the compiler

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Answer & Solution

Answer: Option D

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4

What is the purpose of a destructor in C++?

A) A special member function that destroys objects B) A function used to create objects C) A function used to initialize objects D) A function used to access class members

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Answer & Solution

Answer: Option A

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5

What is the purpose of the 'explicit' keyword before a constructor in C++?

A) To mark the constructor as static B) To specify the return type of the constructor C) To allow implicit conversions during object initialization D) To prevent implicit conversions during object initialization

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Answer: Option D

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6

Which keyword is used to prevent inheritance in C++?

A) override B) virtual C) final D) sealed

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Answer & Solution

Answer: Option C

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7

What is the difference between a shallow copy and a deep copy in C++?

A) Shallow copy is performed using copy constructors, while deep copy is performed using assignment operators B) Shallow copy copies only the memory addresses of the objects, while deep copy copies the actual content C) Shallow copy is faster than deep copy D) None of the above

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Answer: Option B

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8

What is the process of hiding the implementation details of a class and showing only the necessary features to the outside world called in C++?

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

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Answer & Solution

Answer: Option A

Solution:

Abstraction in C++ refers to the process of hiding the implementation details of a class and exposing only the essential features to the outside world.

It allows the user to interact with an object without knowing the internal complexity, making the code cleaner, modular, and easier to maintain.

Why other options are incorrect:

Polymorphism deals with using the same function or operator in different ways.

Encapsulation is about wrapping data and functions together into a single unit (class).

Inheritance allows one class to acquire the properties of another.

Therefore, the correct answer is Abstraction.

9

What is a constructor initialization list in C++?

A) A list of destructor calls B) A list of initializations for member variables C) A list of default arguments for the constructor D) None of the above

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Answer: Option B

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10

What is the access specifier that allows members of a class to be accessed from anywhere in the program in C++?

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

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Answer & Solution

Answer: Option D

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Constructors and Destructors in C++ MCQ question and answer with solution | C++ Programimg MCQs