C++ MCQs - Virtual Functions

This section focuses on the "Virtual Functions" in C++ programming langauge. These Multiple Choice Questions (MCQ) should be practiced to improve the C++ programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. A ___________ is a member function which is declared within a base class and is re-defined (overridden) by a derived class.

A. Static function
B. Virtual function
C. Lambdas function
D. Dynamic function

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2. Functions are declared with a _________ keyword in base class.

A. init
B. self
C. virtual
D. extend

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3. Virtual functions cannot be static.

C. Can be true or false
D. Can not say

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4. Which of the following are the limitations of virtual functions?

A. function call takes slightly longer time
B. virtual functions can make it a little more difficult to figure out where a function is being called from
C. Both A and B
D. None of the above

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5. Virtual functions are accessed through?

A. variable
B. array
C. object
D. object pointers

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6. When the function has no definition, such function is known as ________ function.

A. pure virtual function
B. do-nothing
C. late function
D. Both A and B

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7. What is the syntax for overriding a virtual function in a derived class?

A. virtual void functionName() const;
B. void functionName() override;
C. virtual void functionName() = 0;
D. void functionName() const override;

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8. Which class cannot have virtual functions?

A. Derived classes
B. Abstract classes
C. Concrete classes
D. None of the above

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9. Which access specifier can a virtual function have in a base class?

A. Private
B. Protected
C. Public
D. Any of the above

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10.  A virtual function can be a friend function of another class.

A. Yes
B. No
C. Can be yes or no
D. Can not say

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