OOP Virtual Functions Quiz Online Practice Test

1. A virtual function is a ______ function in the base class that is intended to be overridden in the ______ class, allowing a pointer to the base class to call the ______ class’s version of the function.

Base, derived, derived

Derived, derived, derived

Base, derived, base

Base, base, derived

2. What does a virtual function guarantee for an object?

The correct method is called based on the class that defines it

The correct method is called based on the specific object being used

The correct method is called regardless of the type of reference used for the function call

The correct method is called based on the type of function being invoked by the object

3. Virtual functions are primarily used to achieve ___________.

Compile-time polymorphism

Interpreter polymorphism

Runtime polymorphism

Code-based polymorphism

4. Which keyword is used to declare a virtual function?

virtual

virt

anonymous

virtually

5. Where should a virtual function be defined?

Twice in the base class

In the derived class

In both the base class and the derived class

In the base class

6. Virtual function resolution occurs at ___________.

Compile time

Interpretation time

Runtime

During source code writing

7. Under which access specifier should a virtual function be declared?

Private

Public

Protected

Default

8. Virtual functions cannot be made ____________.

Static functions

Parameterized functions

Functions with default arguments

Functions with zero parameters

9. What is a necessary condition for a virtual function to enable runtime polymorphism?

The virtual function must be accessed by its direct name

The virtual function must be accessed using a base class object

The virtual function must be accessed through a pointer or reference

The virtual function must be accessed using a derived class object only

10. Which statement is accurate regarding virtual functions?

The prototype must differ between the base and derived classes

The prototype must be identical in both the base and derived classes

The prototype needs to be defined only in the base class

The prototype must have different signatures in the base and derived classes

11. Virtual functions must be declared and defined in the _____________ class and overridden in the _____________ class.

Base, base

Derived, derived

Derived, base

Base, derived

12. In a derived class, it is __________ to override a virtual function.

Necessary

Optional

Not allowed

Recommended

13. Which of the following statements is accurate?

A class can have a virtual destructor but not a virtual constructor

A class can have a virtual constructor but not a virtual destructor

A class can have both a virtual constructor and a virtual destructor

A class can have either a virtual destructor or a virtual constructor, but not both

14. If a virtual function from the base class is overridden in a derived class, then ______________.

It must also be declared virtual in the derived class

It may or may not be declared virtual in the derived class

It does not need to be declared virtual in the derived class

It should be declared normally in the derived class

Test Name:	OOP Virtual Functions Quiz
Subject Category:	Computer Science
Test Type:	Multiple Choice Questions
Total Score / Questions:	14 / 14
Time Allowed:	10 Min
Who Should Practice this Test:	Students, job seekers, or professionals preparing for competitive exams and interviews.

OOP Virtual Functions MCQ Quiz Online Practice Test