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Polymorphism And Abstract Function MCQ

Which of the followings are true about Virtual functions?

Constructor Functions cannot be virtual

They must be non-static member function of the class

All

They cannot be friends

Answer

Correct Answer: All

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If a class contains pure virtual function, then it is termed as_____________________

Virtual class

Sealed class

Pure Local class

Abstract class

Answer

Correct Answer: Abstract class

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If abstract class is inherited by derived class, then_______________.

Derived class should provide definition for all the pure virtual functions

All

Objects of derived class can’t be created if it fails to implement pure virtual functions

Derived class also become abstract if fails to implement pure virtual functions

Answer

Correct Answer: All

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When a virtual function is redefined by the derived class, it is called___________.

Rewriting

All

Overriding

Overloading

Answer

Correct Answer: Overriding

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We can create objects of the abstract class.

True

False

Answer

Correct Answer: False

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Find the wrong statement/s about Abstract Class.

We can’t create its objects

It contains at least one pure virtual function

We can’t create pointers to an abstract class

We can create references to an abstract class

Answer

Correct Answer: We can’t create pointers to an abstract class

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_______________ is a member function that is declared within a base class and redefined by derived class.

Static function

Friend function

Virtual function

Const member function

Answer

Correct Answer: Virtual function

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While redefining a virtual function in the derived class, if its prototype is changed then___________________.

Its virtual nature will be lost

None

It will be overloaded by the compiler And Its virtual nature will be lost

It will be overloaded by the compiler

Answer

Correct Answer: It will be overloaded by the compiler And Its virtual nature will be lost

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Run time polymorphism can be achieved with______.

None

Virtual function

Container class

Virtual Base class

Answer

Correct Answer: Virtual function

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Syntax for Pure Virtual Function is______________.

Void virtual show()==0

Virtual void show()=0

Void virtual show()=0

Virtual void show()==0

Answer

Correct Answer: Virtual void show()=0

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Runtime polymorphism is achieved only when a virtual function is accessed through a pointer to the base class.

True

False

Answer

Correct Answer: True

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A virtual function that has no definition within the base class is called____________.

Pure Const function

Friend function

Pure virtual function

Pure static function

Answer

Correct Answer: Pure virtual function

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