Question 1

In C++, polymorphism is based on the ability to make member functions of a class

Accepted Answer

A)  protected.
B)  virtual.
C)  static.
D)  encapsulated.
E)  None of the aboveF) B) and D)
G) A) and E)

Question 2

In C++, polymorphism is very difficult to achieve unless you also use inheritance.

Accepted Answer

A) True 
 B)False  True

Question 3

Polymorphism in C++ will not work unless .

Accepted Answer

A)  the <polymorphic> header file is included
B)  the members of the class are public
C)  pointers or references are being used
D)  All of the above
E)  None of the aboveF) None of the above
G) B) and E)

Question 4

A pure virtual function

Accepted Answer

A)  is a virtual function that has no implementation.
B)  is a virtual function that performs a single task in program.
C)  is a virtual function that has been completely debugged.
D)  is one that is only called from within a virtual constructor.
E)  None of the aboveF) B) and E)
G) C) and D)

Question 5

An abstract class is

Accepted Answer

A)  one that supports polymorphism.
B)  one that has all of its member functions declared private.
C)  one that has all of its member variables declared private.
D)  one that has at least one pure virtual function.
E)  None of the aboveF) All of the above
G) C) and E)

Question 6

An abstract class is somewhat restricted in how it can be used because

Accepted Answer

A)  All of its members must be public.
B)  it cannot use dynamic binding for its member functions.
C)  the compiler does not allow objects of the class to be created.
D)  it cannot use static binding for its member functions.
E)  None of the aboveF) C) and D)
G) A) and D)

Question 7

Polymorphism is when in a class hierarchy perform differently, depending upon the class of the object making the call.

Accepted Answer

A)  derived class constructors
B)  derived class destructors
C)  member functions
D)  base class constructors
E)  None of the aboveF) A) and B)
G) C) and E)

Question 8

functions are dynamically bound by the compiler.

Accepted Answer

A)  Constructor
B)  Static
C)  Destructor
D)  Virtual
E)  None of the aboveF) A) and D)
G) B) and C)

Question 9

A virtual function is declared by placing the keyword in front of the return type in the base class's function declaration.

Accepted Answer

A)  protected
B)  virtual
C)  private
D)  public
E)  None of the aboveF) A) and E)
G) A) and D)

Question 10

A class with at least one pure virtual function is called

Accepted Answer

A)  an abstract class.
B)  a pure virtual class.
C)  a virtual base class.
D)  All of the above
E)  None of the aboveF) All of the above
G) A) and B)

Question 11

When more than one class is derived from a base class, the situation is called

Accepted Answer

A)  encapsulation.
B)  multiplicity.
C)  population.
D)  polymorphism.
E)  None of the aboveF) A) and E)
G) B) and C)

Question 12

To indicate that a member function of a class is pure virtual,

Accepted Answer

A)  you must include the <pure> header file.
B)  you use the keywords pure virtual.
C)  you must put = 0 where the body of the function would go.
D)  All of the above
E)  None of the aboveF) C) and E)
G) A) and B) C

Question 13

to a base class may be assigned the address of a derived class object.

Accepted Answer

A)  Access specifiers
B)  Static members
C)  Pointers
D)  Private members
E)  None of the aboveF) All of the above
G) B) and D)

Question 14

Static binding occurs when the compiler binds a function call at compile time.

Accepted Answer

A) True 
 B)False

Question 15

Declaring a member function of a class to be a _ will cause the C++ compiler to use dynamic binding.

Accepted Answer

A)  static function
B)  destructor function
C)  virtual function
D)  constructor function
E)  None of the aboveF) C) and D)
G) All of the above

Question 16

Pointers to a base class may be assigned the address of a derived class object.

Accepted Answer

A) True 
 B)False

Question 17

The term means the ability to take many forms.

Accepted Answer

A)  polymorphism
B)  inheritance
C)  member function
D)  encapsulation
E)  None of the aboveF) B) and D)
G) B) and E)

Question 18

When the compiler binds a call to a member function using only information available at compile time, the compiler is said to use binding.

Accepted Answer

A)  static
B)  local
C)  dynamic
D)  safe
E)  None of the aboveF) A) and C)
G) None of the above

Question 19

When a virtual member function of a class in a class hierarchy is invoked through a pointer to an object in the class hierarchy, the compiler will select the member function to be invoked

Accepted Answer

A)  from the class of the object that is pointed to.
B)  from the class of the type of the pointer.
C)  from the base class of the inheritance hierarchy.
D)  from the derived class of the base pointer object.
E)  None of the aboveF) A) and B)
G) B) and E) A

Question 20

A pure virtual function

Accepted Answer

A)  must be accompanied by a virtual constructor of the same class.
B)  must be overridden in a derived class for the function to be useful.
C)  executes more efficiently than a non- pure virtual function.
D)  All of the above
E)  None of the aboveF) A) and D)
G) B) and D)

Exam 15: Polymorphism and Virtual Functions

In C++, polymorphism is based on the ability to make member functions of a class

Correct AnswerverifiedShow Answer

In C++, polymorphism is very difficult to achieve unless you also use inheritance.

Correct AnswerverifiedTrue

Polymorphism in C++ will not work unless .

Correct AnswerverifiedShow Answer

A pure virtual function

Correct AnswerverifiedShow Answer

An abstract class is

Correct AnswerverifiedShow Answer

An abstract class is somewhat restricted in how it can be used because

Correct AnswerverifiedShow Answer

Polymorphism is when in a class hierarchy perform differently, depending upon the class of the object making the call.

Correct AnswerverifiedShow Answer

functions are dynamically bound by the compiler.

Correct AnswerverifiedShow Answer

A virtual function is declared by placing the keyword in front of the return type in the base class's function declaration.

Correct AnswerverifiedShow Answer

A class with at least one pure virtual function is called

Correct AnswerverifiedShow Answer

When more than one class is derived from a base class, the situation is called

Correct AnswerverifiedShow Answer

To indicate that a member function of a class is pure virtual,

Correct AnswerverifiedC

to a base class may be assigned the address of a derived class object.

Correct AnswerverifiedShow Answer

Static binding occurs when the compiler binds a function call at compile time.

Correct AnswerverifiedShow Answer

Declaring a member function of a class to be a _ will cause the C++ compiler to use dynamic binding.

Correct AnswerverifiedShow Answer

Pointers to a base class may be assigned the address of a derived class object.

Correct AnswerverifiedShow Answer

The term means the ability to take many forms.

Correct AnswerverifiedShow Answer

When the compiler binds a call to a member function using only information available at compile time, the compiler is said to use binding.

Correct AnswerverifiedShow Answer

When a virtual member function of a class in a class hierarchy is invoked through a pointer to an object in the class hierarchy, the compiler will select the member function to be invoked

Correct AnswerverifiedA

A pure virtual function

Correct AnswerverifiedShow Answer

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