C++ mcq questions with answer – Set 5

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#1. What is meant by a polymorphism in C++?

class having only single form

class having only single form

class having four forms

class having four forms

class having many forms

class having many forms

class having two forms

class having two forms

#2. Which concept allows you to reuse the written code in C++?

Inheritance

Inheritance

Polymorphism

Polymorphism

Abstraction

Abstraction

Encapsulation

Encapsulation

#3. What is abstract class in C++?

Any Class in C++ is an abstract class

Any Class in C++ is an abstract class

Class from which any class is derived

Class from which any class is derived

Class specifically used as a base class with atleast one virtual functions

Class specifically used as a base class with atleast one virtual functions

Class specifically used as a base class with atleast one pure virtual functions

Class specifically used as a base class with atleast one pure virtual functions

#4. Which of the following constructors are provided by the C++ compiler if not defined in a class?

Copy constructor

Copy constructor

Default constructor

Default constructor

Assignment constructor

Assignment constructor

All of the mentioned

All of the mentioned

#5. What is the benefit of c++ input and output over c input and output?

Both Type safety & Exception

Both Type safety & Exception

Sequence container

Sequence container

Exception

Exception

Type safety

Type safety

#6. What will be the output of the above C++ program?

LearningWerning!

LearningWerning!

LearningWerning!.

LearningWerning!.

LearningWerning.

LearningWerning.

LearningWerning.!

LearningWerning.!

#7. How structures and classes in C++ differ?

Structures by default hide every member whereas classes do not

Structures by default hide every member whereas classes do not

In Structures, members are public by default whereas, in Classes, they are private by default

In Structures, members are public by default whereas, in Classes, they are private by default

Structures cannot have private members whereas classes can have

Structures cannot have private members whereas classes can have

In Structures, members are private by default whereas, in Classes, they are public by default

In Structures, members are private by default whereas, in Classes, they are public by default

#8. What will be the output of the above C++ program?

5

5

6

6

compile time error

compile time error

runtime error

runtime error

#9. What will be the output of the above C++ code snippet?

10.0 5

10.0 5

10 2.5

10 2.5

10.0 5.0

10.0 5.0

5.0 2.5

5.0 2.5

#10. Pick the incorrect statement about inline functions in C++?

Saves overhead of a return call from a function

Saves overhead of a return call from a function

They are generally very large and complicated function

They are generally very large and complicated function

These functions are inserted/substituted at the point of call

These functions are inserted/substituted at the point of call

They reduce function call overheads

They reduce function call overheads

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