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OOP (Object-oriented programming) MCQ

Each object of a class has its own copy of the class's ________.

Member functions

Member variables

Constructor and destructor functions

All of these

None of these

Answer

Correct Answer: Member variables

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The ________ is used to protect important data.

Private and public

Private access specifier

Destructor function

In their own header files

Answer

Correct Answer: Private access specifier

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Objects are created from abstract data types that encapsulate and together.

Constructor, created

Dot operator.

Subscripts

Data, functions

Answer

Correct Answer: Data, functions

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Every event object has the _____ method that returns the object that triggered the event.

GetSource()

GetActionCommand()

GetTimeStamp()

GetWhen()

GetKeyChar().

Answer

Correct Answer: GetSource()

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A class is a(n) _____________ that is defined by the programmer.

Attribute

Data type

Method

Function

Answer

Correct Answer: Data type

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Can I inherit the constructor and destructor of a base class?

Yes

Answer

Correct Answer: No

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Can I create new operators using operator overloading?

Yes

Answer

Correct Answer: Yes

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_____________ is actually a parameterized constructor which takes some parameters in order to create instance of a class.

Explicit constructor

Parameterized constructor

Implicit constructor

Virtual constructor

Answer

Correct Answer: Explicit constructor

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What is a “const member function”?

None

It means the function is only a read-only function

One which always returns the same values, given the same arguments

Used for constructor and destructor

Answer

Correct Answer: It means the function is only a read-only function

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If the child object can exist beyond the lifetime of its parent, then the relationship is ____________.

None

Composition

Generalization

Aggregation

Answer

Correct Answer: Aggregation

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__________ allows for the separation of object interactions from classes and inheritance into distinct layers of abstraction.

Decoupling

Detaching

Loosening

Dispatching

Answer

Correct Answer: Decoupling

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Which of the following is false for a destructor?

The destructor has the same name as the class

If the object was created with a new expression, then its destructor is called when the delete operator is applied to a pointer to the object

Its main purpose is to clean up and to free the resources

None

Answer

Correct Answer: None

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Common behavior can be defined in a superclass and inherited into a subclass using the ___________ keyword.

Inherits

Extend

Extends

Inherit

Answer

Correct Answer: Extends

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What are the major elements in an object model?

Abstraction, Encapsulation and persistence

Typing

Hierarchy, concurrency and typing

Abstraction, encapsulation and hierarchy

Answer

Correct Answer: Abstraction, encapsulation and hierarchy

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A recursive function would result in infinite recursion, if the following were left out:

Subtraction

Base call

Recursive call

Local variable declarations

Answer

Correct Answer: Base call

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Constructors never have an explicit return type.

False

True

Answer

Correct Answer: True

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In dynamic type case a type safety check is incurred at ____________.

Run time

Compile time

Answer

Correct Answer: Run time

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Constructors have to be called before the main function:

True

False

Answer

Correct Answer: True

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What is dynamic dispatch?

When the function to be executed in response to a function call is determined at the end of the function call

When the function to be executed in response to a function call is determined at run-time

None

When the function to be executed in response to a function call is determined at compile-time

Answer

Correct Answer: When the function to be executed in response to a function call is determined at run-time

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Which of the following is true for package access modifier?

The Class which has a Public Modifier can be accessed by all the classes from the particular package and also from different packages

The class which has private as the modifier cannot be accessed by any class even with in the package

The Class which has a Public Modifier can be accessed by all the classes from the particular package and also from different packages And The class which has private as the modifier cannot be accessed by any class even with in the package

Answer

Correct Answer: The Class which has a Public Modifier can be accessed by all the classes from the particular package and also from different packages And The class which has private as the modifier cannot be accessed by any class even with in the package

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OOP (Object-oriented programming) MCQ

Each object of a class has its own copy of the class's ________.

The ________ is used to protect important data.

Objects are created from abstract data types that encapsulate ________ and ________ together.

Every event object has the _____ method that returns the object that triggered the event.

A class is a(n) _____________ that is defined by the programmer.

Can I inherit the constructor and destructor of a base class?

Can I create new operators using operator overloading?

_____________ is actually a parameterized constructor which takes some parameters in order to create instance of a class.

What is a “const member function”?

If the child object can exist beyond the lifetime of its parent, then the relationship is ____________.

__________ allows for the separation of object interactions from classes and inheritance into distinct layers of abstraction.

Which of the following is false for a destructor?

Common behavior can be defined in a superclass and inherited into a subclass using the ___________ keyword.

What are the major elements in an object model?

A recursive function would result in infinite recursion, if the following were left out:

Constructors never have an explicit return type.

In dynamic type case a type safety check is incurred at ____________.

Constructors have to be called before the main function:

What is dynamic dispatch?

Which of the following is true for package access modifier?

Objects are created from abstract data types that encapsulate and together.