Quiz for Runtime polymorphism

Q1: What is runtime polymorphism?

A. Polymorphism resolved during runtime B. Polymorphism resolved during compilation C. Polymorphism using templates D. Polymorphism using function overloading

Q2: Which keyword enables runtime polymorphism in C++?

A. virtual B. inline C. friend D. static

Q3: What is necessary for runtime polymorphism to work?

A. A base class pointer or reference B. Overloaded functions C. Template functions D. Static member functions

Q4: How does C++ achieve runtime polymorphism?

A. Through virtual functions B. Function overloading C. Operator overloading D. Macros

Q5: Can constructors be virtual?

A. No, constructors cannot be virtual B. Yes, always C. Only in derived classes D. Only in abstract classes

Q6: What happens when a base class pointer calls a virtual function?

A. Derived class version is called if overridden B. Base class version is always called C. Compilation error D. Function overloading happens

Q7: Which of these is an example of runtime polymorphism?

A. Virtual function overriding B. Function overloading C. Operator overloading D. Default arguments

Q8: What type of binding does runtime polymorphism use?

A. Dynamic binding B. Static binding C. Early binding D. Compile-time binding

Q9: What will happen if a base class function is not declared virtual?

A. Base class function is called even with derived pointer B. Derived class function is called C. Compilation error D. Linker error

Q10: How can runtime polymorphism improve software design?

A. By enabling flexible and extensible code B. By reducing compilation time C. By avoiding function calls D. By disabling inheritance

Q11: Which of these must be true for a function to support runtime polymorphism?

A. Declared virtual in base class and overridden in derived B. Declared inline C. Declared static D. Declared const

Q12: Can runtime polymorphism be achieved without inheritance?

A. No, inheritance is required B. Yes, always C. Only with templates D. Only with macros

Q13: What is a pure virtual function?

A. A virtual function with = 0 making class abstract B. A virtual function with implementation C. A static function D. A function without parameters

Q14: What is the effect of declaring a class abstract?

A. Cannot instantiate the class B. All functions are static C. Class is sealed D. Class can be instantiated

Q15: Why use virtual destructors?

A. To ensure derived destructors are called B. To prevent object creation C. To disable inheritance D. To speed up program

Q16: What is the vtable?

A. A table of virtual functions for dynamic dispatch B. A variable table C. A static table D. A template list

Q17: Which of these is a disadvantage of runtime polymorphism?

A. Overhead due to dynamic dispatch B. Cannot use inheritance C. Limited functionality D. No flexibility

Q18: Can runtime polymorphism be used with non-pointer objects?

A. No, it requires pointers or references B. Yes, always C. Only with static objects D. Only with constants

Q19: What happens if a derived class does not override a virtual function?

A. Base class version is called B. Error during compilation C. Error during runtime D. Function is deleted