C++ MCQ: OOPS Multiple Choice Questions

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C++ OOPS Multiple Choice Questions And Answers

1 / 60

Which of the following explains Polymorphism?

int func(int, int);
float func1(float, float);

int func(int);
int func(int);

int func(float);
float func(int, int, char);

int func();
int new_func();

2 / 60

Which of the following are true about Virtual functions?

They must be non-static member function of the class

They cannot be friends

Constructor Functions cannot be virtual

All of these

3 / 60

If a class contains static variable, then every object of the class has its copy of static variable.

True

false

4 / 60

In C++, polymorphism requires:

Inheritance only

Inheritance, Virtual functions and references

References only

Virtual functions only

5 / 60

Pick the correct statement about references.

References can be assigned value NULL

References once assigned cannot be changed to refer another variable

Reference should not be initialized when created

Reference is the same as pointers

6 / 60

How the template class is different from the normal class?

Template class generate objects of classes based on the template type

Template class saves system memory

Template class helps in making genetic classes

All of the mentioned

7 / 60

How many types of polymorphism in c++?

8 / 60

Which of the following is not correct for virtual function in C++?

Virtual function should be accessed using pointers.

Virtual function can be static.

Must be declared in public section of class.

Virtual function is defined in base class.

9 / 60

Inline functions are useful when

Function has many static variables

Function is small and we want to avoid function call overhead.

Function is large with many nested loops

None of the above

10 / 60

A virtual function that has no definition within the base class is called____________.

Pure virtual function

Pure static function

Pure Const function

Friend function

11 / 60

Which of the following function must use reference.

Assignment operator function

Copy Constructor

Destructor

Parameterized constructor

12 / 60

In any ways, Non-member function cannot have access to the private data of the class.

True

False

13 / 60

While overloading binary operators using member function, it requires ___ argument/s.

Zero

One

Two

Three

14 / 60

Can constructors be overloaded?

Yes

15 / 60

Assume class TEST. Which of the following statements is/are responsible to invoke copy constructor?

TEST T2(T1)

TEST T4 = T1

T2 = T1

both a and b

All of these

16 / 60

Which of the following provides a programmer with the facility of using the object of a class inside other classes?

Composition

Inheritance

Encapsulation

Abstraction

17 / 60

If base class has constructor with arguments, then it is ________________ for the derived class to have constructor and pass the arguments to base class constructor.

Optional

Mandatory

Compiler dependent

Error

18 / 60

An operator function is created using _____________ keyword.

iterator

allocator

constructor

operator

19 / 60

What are the things that are inherited from the base class?

Constructor and its destructor

Operator=() members

Friends

All of the mentioned

20 / 60

When a virtual function is redefined by the derived class, it is called___________.

Overloading

Overriding

Rewriting

All of these

21 / 60

What is the difference between references and pointers?

References are an alias for a variable whereas pointer stores the address of a variable

References and pointers are similar

References stores address of variables whereas pointer points to variables

Pointers are an alias for a variable whereas references stores the address of a variable

22 / 60

Which of the following shows multiple inheritances?

A->B->C

A->B; A->C

A,B->C

B->A

23 / 60

The associativity of which of the following operators is Left to Right, in C++?

Logical not

Unary Operator

Array element access

addressof

24 / 60

How run-time polymorphisms are implemented in C++?

Using Inheritance

Using Virtual functions

Using Templates

Using Inheritance and Virtual functions

25 / 60

_________________are used for generic programming.

Inheritance

Virtual Functions

Templates

None of these

26 / 60

A member function can always access the data in __________ , (in C++).

the object of which it is a member

the class of which it is member

the public part of its class

the private part of its class

27 / 60

How access specifiers in Class helps in Abstraction?

They allows us to show only required things to outer world

They help in keeping things together

Abstraction concept is not used in classes

They does not helps in any way

28 / 60

If abstract class is inherited by derived class, then_______________ .

Derived class should provide definition for all the pure virtual functions

Derived class also become abstract if fails to implement pure virtual functions

Objects of derived class can’t be created if it fails to implement pure virtual functions

All of the above

29 / 60

Wrapping data and its related functionality into a single entity is known as _____________

Encapsulation

Abstraction

Modularity

Polymorphism

30 / 60

While redefining a virtual function in the derived class, if its prototype is changed then ___________________ .

It will be overloaded by the compiler

Its virtual nature will be lost

both a and b

Compiler will generate “Prototype mismatch error”

31 / 60

In CPP program, Can we declare and define a user defined function inside a struct as we do in a class ?

Yes

Depend on compiler

32 / 60

Which of the following is correct?

Derived class pointer object cannot point to a base class object

Base class pointer object cannot point to a derived class object

A derived class cannot have pointer objects

A base class cannot have pointer objects

33 / 60

Why references are different from pointers?

A reference cannot be made null

A reference cannot be changed once initialized

No extra operator is needed for dereferencing of a reference

All of the mentioned

34 / 60

Who is the father of C++?

Ken Thompson

Bjarne Stroustrup

Dennis Ritchie

Guido Van Rossum

35 / 60

What is the syntax of class template?

template <paramaters> class declaration

Template <paramaters> class declaration

temp <paramaters> class declaration

Temp <paramaters> class declaration

36 / 60

Which of the not an inheritance?

Single Inheritance

Hierarchical

Distributive

Multilevel

37 / 60

Classes in CPP are________

derived data types

User defined data types

built-in data types

All of these

38 / 60

What does polymorphism in OOPs mean?

Concept of allowing overiding of functions

Concept of keeping things in differnt modules/files

Concept of wrapping things into a single unit

Concept of hiding data

39 / 60

Which OOPs concept is allowed to reuse the code?

Inheritance

Message Passing

Polymorphism

Abstraction

40 / 60

How structures and classes in C++ differ?

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

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

Structures by default hide every member whereas classes do not

Structures cannot have private members whereas classes can have

41 / 60

What does modularity mean?

Hiding part of program

Subdividing program into small independent parts

Overriding parts of program

Wrapping things into single unit

42 / 60

const member function does not allow to modify/alter the value of any data member of the class.

True

False

43 / 60

Constant variables can be created in CPP by using ________ .

#define

enum

const

All of the above

None of the above

44 / 60

Which of the following approach is followed by the c++

top-bottom

procedural

bottom-up

top-down

45 / 60

Which one of the following is not a member of the class?

Virtual Function

Friend Function

Constant Function

Static function

46 / 60

Assigning one or more function body to the same name is called ____________ .

Function Overriding

Function Overloading

Both a and b

None of the above

47 / 60

How can we make a C++ class such that objects of it can only be created using new operator? If the user tries to create an object directly, the program produces compiler error.

By making constructor private

By making destructor private

By making both constructor and destructor private

It is not possible in C++

48 / 60

Which symbol is used as an address operator?

49 / 60

Which of the following class allows to declare only one object of it?

Abstract class

Virtual class

Singleton class

Friend class

50 / 60

Which of the following is not correct (in C++) ?

1. Class templates and function templates are instantiated in the same way.
2. Class templates differ from function templates in the way they are initiated.
3. Class template is initiated by defining an object using the template argument.
4. Class templates are generally used for storage classes.

2,3

1,2,3,4

2,3,4

51 / 60

How compile-time polymorphisms are implemented in C++?

Using Inheritance

Using Virtual functions

Using Templates

Using Inheritance and Virtual functions

52 / 60

Which of the following is true about inline functions and macros.

Macros are prone to bugs and errors, inline functions are not.

Macros are processed by pre-processor and inline functions are processed in later stages of compilation.

Inline functions do type checking for parameters, macros don't

Macros cannot have return statement, inline functions can.

All of the above

53 / 60

The member in a class by default is ____?

Protected

Private

Public

Static

54 / 60

In CPP, cin and cout are the predefined stream __________ .

Operator

Functions

Objects

Data types

55 / 60

Which operator is overloaded for cout operation?

>>>

56 / 60

Which of the following is not a type of Constructor?

Friend constructor

Copy constructor

Default constructor

Parameterized constructor

57 / 60

Which of the following is an abstract data type?

int

float

class

string

58 / 60

What is the effect of a negative number in a field width specifier?

the values are displayed right justified

the values are displayed left justified

the values are displayed centered

the values are displayed as negative numbers

59 / 60

Identify the incorrect statement.

Reference is the alternate name of the object

A reference value once defined can be reassigned

A reference value once defined cannot be reassigned

Reference is the alternate name of the variable

60 / 60

Method overriding can be prevented by using the final as a modifier at ______.

the start of method declaration.

the start of derived class.

the start of the class.

the start of the method declaration in the derived class.

Your score is

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