Polymorphism — Practice MCQs for CCAT

Correct Answer: B — Function overloading

Function overloading is resolved at compile time (static polymorphism).

Correct Answer: C — Virtual functions

Virtual functions enable runtime polymorphism through dynamic binding.

Correct Answer: B — virtual void f() = 0

Pure virtual function is declared with = 0.

Correct Answer: B — At least one pure virtual function

A class with at least one pure virtual function is abstract.

Correct Answer: B — Only inherited

Abstract classes cannot be instantiated, only inherited.

Correct Answer: C — Parameter list

Overloading is resolved by different parameter list (number/type).

Correct Answer: B — ::

Scope resolution operator (::) cannot be overloaded.

Correct Answer: C — Using base pointer to delete derived object

Virtual destructor ensures proper cleanup when deleting via base pointer.

Correct Answer: B — Classes with virtual functions

Virtual pointer (vptr) is created for classes with virtual functions.

Correct Answer: B — Runtime

Late binding (dynamic binding) occurs at runtime.

Correct Answer: B — Giving operators new meaning for user types

Operator overloading allows giving special meaning to operators for user-defined types.

Correct Answer: B — Function overrides base virtual function

override keyword ensures the function actually overrides a base class virtual function.

Correct Answer: B — Prevents further overriding

A virtual function marked final cannot be overridden in further derived classes.

Correct Answer: B — Safe downcasting with runtime check

dynamic_cast performs safe downcasting with runtime type checking for polymorphic types.

Correct Answer: B — One vptr per object

Each object of a class with virtual functions has one vptr pointing to the vtable.

Correct Answer: B — Type information at runtime

typeid returns type_info object containing runtime type information.

Correct Answer: B — Overriding function can return derived type

Covariant return allows overriding function to return pointer/reference to derived class.

Correct Answer: B — Derived function has same name but different signature

Function hiding happens when derived class has same function name but different parameters.

Correct Answer: A — Runtime Type Information

RTTI (Runtime Type Information) provides type information at runtime using typeid and dynamic_cast.

Correct Answer: B — Calls current class version only

Virtual functions in constructor/destructor call current class version, not derived class.