90+ Object Oriented Programming (OOP) Solved MCQs

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1.	Every class has at least one constructor function, even when none is declared.
A.	true
B.	false
Answer» A. true

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2.	Can constructors be overloaded?
A.	true
B.	false
Answer» A. true

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3.	What is the difference between struct and class in terms of Access Modifier?
A.	by default all the struct members are private while by default class members are public.
B.	by default all the struct members are protected while by default class members are private.
C.	by default all the struct members are public while by default class members are private.
D.	by default all the struct members are public while by default class members are protected.
Answer» C. by default all the struct members are public while by default class members are private.

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4.	An abstract class can be instantiated.
A.	true
B.	false
Answer» B. false

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5.	The default access level assigned to members of a class is
A.	private
B.	public
C.	protected
D.	needs to be assigned
Answer» A. private

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6.	There is nothing like a virtual constructor of a class.
A.	true
B.	false
Answer» B. false

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7.	Which of the following operators allow defining the member functions of a class outside the class?
A.	::
B.	?
C.	:?
D.	%
Answer» A. ::

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8.	Which type of class has only one unique value for all the objects of that same class?
A.	this
B.	friend
C.	static
D.	both a and b
Answer» C. static

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9.	Which one of the following is not a fundamental data type in C++?
A.	float
B.	string
C.	int
D.	char
Answer» B. string

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10.	What is a constructor?
A.	a class automatically called whenever a new object of this class is created.
B.	a class automatically called whenever a new object of this class is destroyed.
C.	a function automatically called whenever a new object of this class is created.
D.	a function automatically called whenever a new object of this class is destroyed.
Answer» C. a function automatically called whenever a new object of this class is created.

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11.	Under what conditions a destructor destroys an object?
A.	scope of existence has finished
B.	object dynamically assigned and it is released using the operator delete.
C.	program terminated.
D.	both a and b.
Answer» D. both a and b.

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12.	When class B is inherited from class A, what is the order in which the constructers of those classes are called
A.	class a first class b next
B.	class b first class a next
C.	class b's only as it is the child class
D.	class a's only as it is the parent class
Answer» A. class a first class b next

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13.	Which one of the following is not a valid reserved keyword in C++?
A.	explicit
B.	public
C.	implicit
D.	private
Answer» C. implicit

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14.	Variables declared in the body of a particular member function are known as data members and can be used in all member functions of the class.
A.	true
B.	false
Answer» B. false

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15.	In a class definition, data or functions designated private are accessible
A.	to any function in the program.
B.	only if you know the password.
C.	to member functions of that class.
D.	only to public members of the class.
Answer» C. to member functions of that class.

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16.	A member function can always access the data
A.	in the object of which it is a member.
B.	in the class of which it is a member.
C.	in any object of the class of which it is a member.
D.	in the public part of its class.
Answer» A. in the object of which it is a member.

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17.	Classes are useful because they
A.	can closely model objects in the real world.
B.	permit data to be hidden from other classes.
C.	bring together all aspects of an entity in one place.
D.	options a, b and c
Answer» D. options a, b and c

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18.	For the object for which it was called, a const member function
A.	can modify both const and non-const member data.
B.	can modify only const member data.
C.	can modify only non-const member data.
D.	can modify neither const nor non-const member data.
Answer» D. can modify neither const nor non-const member data.

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19.	Dividing a program into functions
A.	is the key to object-oriented programming.
B.	makes the program easier to conceptualize.
C.	may reduce the size of the program.
D.	option b and c
Answer» D. option b and c

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20.	An expression
A.	usually evaluates to a numerical value.
B.	may be part of a statement.
C.	always occurs outside a function.
D.	option a and b
Answer» D. option a and b

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21.	A variable of type char can hold the value 301.
A.	true
B.	false
Answer» B. false

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22.	In an assignment statement, the value on the left of the equal sign is always equal to the value on the right.
A.	true
B.	false
Answer» B. false

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23.	It’s perfectly all right to use variables of different data types in the same arithmetic expression.
A.	true
B.	false
Answer» A. true

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24.	A function’s single most important role is to
A.	give a name to a block of code.
B.	reduce program size.
C.	accept arguments and provide a return value.
D.	help organize a program into conceptual units.
Answer» D. help organize a program into conceptual units.

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25.	A function argument is
A.	a variable in the function that receives a value from the calling program.
B.	a way that functions resist accepting the calling program’s values.
C.	a value sent to the function by the calling program.
D.	a value returned by the function to the calling program.
Answer» C. a value sent to the function by the calling program.

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26.	When arguments are passed by value, the function works with the original arguments in the calling program.
A.	true
B.	false
Answer» B. false

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27.	Which of the following can legitimately be passed to a function?
A.	a constant
B.	a variable
C.	a structure
D.	all of the above
Answer» D. all of the above

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28.	How many values can be returned from a function?
A.	0
B.	1
C.	2
D.	3
Answer» B. 1

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29.	When a function returns a value, the entire function call can appear on the right side of the equal sign and be assigned to another variable.
A.	true
B.	false
Answer» A. true

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30.	When an argument is passed by reference
A.	a variable is created in the function to hold the argument’s value.
B.	the function cannot access the argument’s value.
C.	a temporary variable is created in the calling program to hold the argument’s value.
D.	the function accesses the argument’s original value in the calling program.
Answer» D. the function accesses the argument’s original value in the calling program.

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31.	Overloaded functions
A.	are a group of functions with the same name.
B.	all have the same number and types of arguments.
C.	make life simpler for programmers.
D.	a and c
Answer» D. a and c

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32.	A static local variable is used to
A.	make a variable visible to several functions.
B.	make a variable visible to only one function.
C.	retain a value when a function is not executing.
D.	b and c
Answer» D. b and c

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33.	In C++ there can be an array of four dimensions.
A.	true
B.	false
Answer» A. true

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34.	When an array name is passed to a function, the function
A.	accesses exactly the same array as the calling program.
B.	refers to the array using a different name than that used by the calling program.
C.	refers to the array using the same name as that used by the calling program.
D.	a and b
Answer» D. a and b

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35.	The compiler will complain if you try to access array element 14 in a 10-element array.
A.	true
B.	false
Answer» B. false

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36.	The extraction operator (>>) stops reading a string when it encounters a space.
A.	true
B.	false
Answer» A. true

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37.	You can read input that consists of multiple lines of text using
A.	the normal cout <<combination.
B.	the cin.get() function with one argument.
C.	the cin.get() function with two arguments.
D.	the cin.get() function with three arguments.
Answer» D. the cin.get() function with three arguments.

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38.	You should prefer C-strings to the Standard C++ string class in new programs.
A.	true
B.	false
Answer» B. false

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39.	Objects of the string class
A.	are zero-terminated.
B.	can be copied with the assignment operator.
C.	do not require memory management.
D.	both b and c
Answer» D. both b and c

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40.	Can destuctors be private in C++?
A.	yes
B.	no
Answer» A. yes

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41.	What is value of size?
A.	28
B.	32
C.	20
D.	24
Answer» C. 20

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42.	What value will be printed for data.i?
A.	10 220.5 230.5 unpredictable value
B.	220
C.	230.5
D.	unpredictable value
Answer» D. unpredictable value

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43.	What is the compilation error for this program?
A.	each undeclared identifier is reported only once
B.	cout and cin not declared in scope
C.	invalid conversion from int to float
D.	all of the above
Answer» B. cout and cin not declared in scope

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44.	What will be the output of the program?
A.	1
B.	default value
C.	will not compile
D.	none of the above
Answer» C. will not compile

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45.	What is the output of the program?
A.	0 0
B.	x = 0 y = 0
C.	0
D.	compilation error
Answer» D. compilation error

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46.	Which function will change the state of the object?
A.	only set()
B.	only display()
C.	display() and set() both
D.	none of the above
Answer» A. only set()

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47.	What will be the output of the following program?
A.	compilation error: display() cannot be accessed in application
B.	compilation error:test class object cannot be accessed in function demo
C.	compilation error: variable x is private in test
D.	both a and b
Answer» C. compilation error: variable x is private in test

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48.	The only integer that can be assigned directly to a pointer is
A.	0
B.	-1
C.	999
D.	-999
Answer» A. 0

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49.	Which of the following feature is not supported by C++?
A.	exception handling
B.	reflection
C.	operator overloading
D.	namespace
Answer» B. reflection

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50.	The operators that cannot be overloaded is
A.	*
B.	-
C.	::
D.	()
Answer» C. ::

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51.	Empty parentheses following a function name in a function prototype indicate that the function does not require any parameters to perform its task.
A.	true
B.	false
Answer» A. true

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52.	C++ programmers concentrate on creating , which contain data members and the member functions that manipulate those data members and provide services to clients.
A.	structures
B.	classes
C.	objects
D.	function
Answer» B. classes

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53.	Which of the following is FALSE about references in C++
A.	a reference must be initialized when declared
B.	once a reference is created, it cannot be later made to reference another object; it cannot be reset
C.	references cannot be null
D.	references cannot refer to constant value
Answer» D. references cannot refer to constant value

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54.	What will be the output of following program? #include <iostream> using namespace std; class Test{ public: Test() { cout <<"Hello from Test() "; } } a; int main() { cout <<"Main Started "; return 0; }
A.	main started
B.	main started hello from test()
C.	hello from test() main started
D.	compiler error: global objects are not allowed
Answer» C. hello from test() main started

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55.	Which of the following is true about constructors. They cannot be virtual.  They cannot be private. They are automatically called by new operator
A.	all 1, 2, and 3
B.	only 1 and 3
C.	only 1 and 2
D.	only 2 and 3
Answer» B. only 1 and 3

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56.	Which of the following operators are overloaded by default by the compiler? 1) Comparison Operator ( == ) 2) Assignment Operator ( = )
A.	both 1 and 2
B.	only 1
C.	only 2
D.	none of the two
Answer» C. only 2

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57.	Which of the following is true about inline functions and macros.
A.	inline functions do type checking for parameters, macros don't
B.	macros cannot have return statement, inline functions can
C.	macros are processed by pre-processor and inline functions are processed in later stages of compilation.
D.	all of the above
Answer» D. all of the above

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58.	In C++, const qualifier can be applied to Member functions of a class Function arguments To a class data member which is declared as static Reference variables
A.	only 1, 2 and 3
B.	only 1, 2 and 4
C.	all
D.	only 1, 3 and 4
Answer» C. all

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59.	Which type is best suited to represent the logical values?
A.	integer
B.	boolean
C.	character
D.	all of the mentioned
Answer» B. boolean

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60.	The following is the C++ style comment
A.	//
B.	/../
C.	–
D.	none of above
Answer» A. //

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61.	Which of the following statements is false?
A.	every c++ program must have a main().
B.	in c++, white spaces and carriage returns are ignored by the compiler.
C.	c++ statements terminate with semicolon.
D.	main() terminates with semicolon.
Answer» D. main() terminates with semicolon.

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62.	Functions can returns
A.	arrays
B.	references
C.	objects
D.	all of above
Answer» D. all of above

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63.	Which of the following control expressions are valid for an if statement?
A.	an integer expression
B.	a boolean expression
C.	either a or b
D.	neither a nor b
Answer» C. either a or b

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64.	What will be the values of x, m and n after execution of the following statements? Int x, m, n; m=10; n=15; x= ++m + n++;
A.	x=25, m=10, n=15
B.	x=27, m=10, n=15
C.	x=26, m=11, n=16
D.	x=27, m=11, n=16
Answer» C. x=26, m=11, n=16

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65.	Which of the following approach is adapted by C++?
A.	top-down
B.	bottom-up
C.	right-left
D.	left-right
Answer» B. bottom-up

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66.	Which of the following is the correct class of the object cout?
A.	iostream
B.	istream
C.	ostream
D.	ifstream
Answer» C. ostream

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67.	Which of the following functions are performed by a constructor?
A.	construct a new class
B.	construct a new object
C.	construct a new function
D.	initialize objects
Answer» D. initialize objects

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68.	Which of the following ways are legal to access a class data member using this pointer?
A.	this->x
B.	this.x
C.	*this.x
D.	*this-x
Answer» A. this->x

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69.	Which operator is having right to left associativity in the following?
A.	array subscripting
B.	function call
C.	addition and subtraction
D.	type cast
Answer» D. type cast

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70.	Which operator is having the highest precedence?
A.	postfix
B.	unary
C.	shift
D.	equality
Answer» A. postfix

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71.	#include <iostream> using namespace std; int main() { int a; a = 5 + 3 * 5; cout <<a; return 0; }
A.	35
B.	20
C.	25
D.	30
Answer» B. 20

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72.	In procedural programming the focus in on …...........
A.	data
B.	structure
C.	function
D.	pointers
Answer» C. function

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73.	In object oriented programming the focus is on ….......
A.	data
B.	structure
C.	function
D.	pointers
Answer» A. data

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74.	Which of the following feature of procedure oriented program is false?
A.	makes use of bottom up approach
B.	functions share global data
C.	the most fundamental unit of program is function
D.	all of these
Answer» A. makes use of bottom up approach

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75.	Which of the following feature of object oriented program is false?
A.	data and functions can be added easily
B.	data can be hidden from outside world
C.	object can communicate with each other
D.	the focus is on procedures
Answer» D. the focus is on procedures

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76.	C++ was originally developed by ….......
A.	donald knuth
B.	bjarne sroustrups
C.	dennis ritchie
D.	none of these
Answer» B. bjarne sroustrups

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77.	Which of the following approach is adopted in C++?
A.	top down
B.	bottom up
C.	horizontal
D.	vertical
Answer» B. bottom up

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78.	Which feature of C++ contain the concept of super class and subclass?
A.	class and object
B.	encapsulation
C.	abstraction
D.	inheritance
Answer» D. inheritance

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79.	The main intention of using inheritance is ….........
A.	to help in converting one data type to other
B.	to hide the details of base class
C.	to extend the capabilities of base class
D.	to help in modular programming
Answer» C. to extend the capabilities of base class

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80.	If particular software can be used in some other application than the one for which it is created then it reveals ….........
A.	data binding
B.	data reusability
C.	data encapsulation
D.	none of these
Answer» B. data reusability

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81.	Which of the following data type does not return anything?
A.	int
B.	short
C.	long
D.	void
Answer» D. void

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82.	How many objects can be created from an abstract class?
A.	zero
B.	one
C.	two
D.	as many as we want
Answer» A. zero

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83.	Which of the following statements is correct for a static member function? 1. It can access only other static members of its class.  It can be called using the class name, instead of objects
A.	only 1 is correct
B.	only 2 is correct
C.	both 1 and 2 are correct
D.	both 1 and 2 are incorrect
Answer» C. both 1 and 2 are correct

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84.	What happens when a class with parameterized constructors and having no default constructor is used in a program and we create an object that needs a zero-argument constructor?
A.	compile-time error
B.	preprocessing error
C.	runtime error
D.	runtime exception
Answer» A. compile-time error

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85.	Which of the following interface determines how your program will be used by other program?
A.	public
B.	private
C.	protected
D.	none of these
Answer» A. public

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86.	What is the difference between struct and class in C++?
A.	all members of a structure are public and structures don't have constructors and destructors
B.	members of a class are private by default and members of struct are public by default. when deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private.
C.	all members of a structure are public and structures don't have virtual functions
D.	all above
Answer» B. members of a class are private by default and members of struct are public by default. when deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private.

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87.	Predict the output of following C++ program #include<iostream> using namespace std; class Empty {}; int main() { cout <<sizeof(Empty); return 0; }
A.	a non zero value
B.	0
C.	compile time error
D.	runtime error
Answer» A. a non zero value

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88.	class Test { int x; }; int main() { Test t; cout <<t.x; return 0; }
A.	0
B.	garbage value
C.	compile time error
Answer» C. compile time error

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89.	Which of the following is true?
A.	all objects of a class share all data members of class
B.	objects of a class do not share non-static members. every object has its own copy
C.	objects of a class do not share codes of non-static methods, they have their own copy
D.	none
Answer» B. objects of a class do not share non-static members. every object has its own copy

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90.	Which of the following is true about the following program #include <iostream> class Test { public: int i; void get(); }; void Test::get() { std::cout <<"Enter the value of i: "; std::cin >>i; } Test t; // Global object int main() { Test t; // local object t.get(); std::cout <<"value of i in local t: "<<t.i<<'\n'; ::t.get(); std::cout <<"value of i in global t: "<<::t.i<<'\n'; return 0; }
A.	compiler error: cannot have two objects with same class name
B.	compiler error in line "::t.get();"
C.	compiles and runs fine
Answer» C. compiles and runs fine

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91.	Which of the following is true about new when compared with malloc. 1) new is an operator, malloc is a function 2) new calls constructor, malloc doesn't 3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.
A.	1 and 3
B.	2 and 3
C.	1 and 2
D.	all 1,2,3
Answer» C. 1 and 2

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92.	Predict the output? #include <iostream> using namespace std; class Test { int x; Test() { x = 5;} }; int main() { Test *t = new Test; cout <<t->x; }
A.	compile time error
B.	garbage
C.	0
D.	5
Answer» A. compile time error

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93.	What happens when delete is used for a NULL pointer? int *ptr = NULL; delete ptr;
A.	compile time error
B.	run time error
C.	no effect
Answer» C. no effect

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94.	Is it fine to call delete twice for a pointer? #include<iostream> using namespace std; int main() { int *ptr = new int; delete ptr; delete ptr; return 0; }
A.	yes
B.	no
Answer» B. no

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95.	Which of the followings is/are automatically added to every class, if we do not write our own.
A.	copy constructor
B.	assignment operator
C.	a constructor without any parameter
D.	all
Answer» D. all

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96.	When a copy constructor may be called?
A.	when an object of the class is returned by value
B.	when an object of the class is passed (to a function) by value as an argument
C.	when an object is constructed based on another object of the same class
D.	all
Answer» D. all

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97.	Output of following program? #include<iostream> using namespace std; class Point { Point() { cout <<"Constructor called"; } }; int main() { Point t1; return 0; }
A.	compile time error
B.	run time error
C.	constructor called
Answer» A. compile time error

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98.	#include<iostream> using namespace std; class Point { public: Point() { cout <<"Constructor called"; } }; int main() { Point t1, *t2; return 0; }
A.	compiler error
B.	constructor called constructor called
C.	constructor called
Answer» C. constructor called

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99.	#include<iostream> using namespace std; class X { public: int x; }; int main() { X a = {10}; X b = a; cout <<a.x <<" " <<b.x; return 0; }
A.	compiler error
B.	10 followed by garbage value
C.	10 10
D.	10 0
Answer» D. 10 0

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90+ Object Oriented Programming (OOP) Solved MCQs

Every class has at least one constructor function, even when none is declared.

Can constructors be overloaded?

What is the difference between struct and class in terms of Access Modifier?

An abstract class can be instantiated.

The default access level assigned to members of a class is

There is nothing like a virtual constructor of a class.

Which of the following operators allow defining the member functions of a class outside the class?

Which type of class has only one unique value for all the objects of that same class?

Which one of the following is not a fundamental data type in C++?

What is a constructor?

Under what conditions a destructor destroys an object?

When class B is inherited from class A, what is the order in which the constructers of those classes are called

Which one of the following is not a valid reserved keyword in C++?

Variables declared in the body of a particular member function are known as data members and can be used in all member functions of the class.

In a class definition, data or functions designated private are accessible

A member function can always access the data

Classes are useful because they

For the object for which it was called, a const member function

Dividing a program into functions

An expression

A variable of type char can hold the value 301.

In an assignment statement, the value on the left of the equal sign is always equal to the value on the right.

It’s perfectly all right to use variables of different data types in the same arithmetic expression.

A function’s single most important role is to

A function argument is

When arguments are passed by value, the function works with the original arguments in the calling program.

Which of the following can legitimately be passed to a function?

How many values can be returned from a function?

When a function returns a value, the entire function call can appear on the right side of the equal sign and be assigned to another variable.

When an argument is passed by reference

Overloaded functions

A static local variable is used to

In C++ there can be an array of four dimensions.

When an array name is passed to a function, the function

The compiler will complain if you try to access array element 14 in a 10-element array.

The extraction operator (>>) stops reading a string when it encounters a space.

You can read input that consists of multiple lines of text using

You should prefer C-strings to the Standard C++ string class in new programs.

Objects of the string class

Can destuctors be private in C++?

What is value of size?

What value will be printed for data.i?

What is the compilation error for this program?

What will be the output of the program?

What is the output of the program?

Which function will change the state of the object?

What will be the output of the following program?

The only integer that can be assigned directly to a pointer is

Which of the following feature is not supported by C++?

The operators that cannot be overloaded is

Empty parentheses following a function name in a function prototype indicate that the function does not require any parameters to perform its task.

C++ programmers concentrate on creating , which contain data members and the member functions that manipulate those data members and provide services to clients.

Which of the following is FALSE about references in C++

What will be the output of following program? #include <iostream> using namespace std; class Test{ public: Test() { cout <<"Hello from Test() "; } } a; int main() { cout <<"Main Started "; return 0; }

Which of the following is true about constructors. They cannot be virtual.  They cannot be private. They are automatically called by new operator

Which of the following operators are overloaded by default by the compiler? 1) Comparison Operator ( == ) 2) Assignment Operator ( = )

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

In C++, const qualifier can be applied to Member functions of a class Function arguments To a class data member which is declared as static Reference variables

Which type is best suited to represent the logical values?

The following is the C++ style comment

Which of the following statements is false?

Functions can returns

Which of the following control expressions are valid for an if statement?

What will be the values of x, m and n after execution of the following statements? Int x, m, n; m=10; n=15; x= ++m + n++;

Which of the following approach is adapted by C++?

Which of the following is the correct class of the object cout?

Which of the following functions are performed by a constructor?

Which of the following ways are legal to access a class data member using this pointer?

Which operator is having right to left associativity in the following?

Which operator is having the highest precedence?

#include <iostream> using namespace std; int main() { int a; a = 5 + 3 * 5; cout <<a; return 0; }

In procedural programming the focus in on …...........

In object oriented programming the focus is on ….......

Which of the following feature of procedure oriented program is false?

Which of the following feature of object oriented program is false?

C++ was originally developed by ….......

Which of the following approach is adopted in C++?

Which feature of C++ contain the concept of super class and subclass?

The main intention of using inheritance is ….........

What will be the output of following program?
#include <iostream> using namespace std;
class Test{
public:
Test() { cout <<"Hello from Test() "; }
} a;
int main()
{
cout <<"Main Started "; return 0;
}

Which of the following is true about constructors.
They cannot be virtual.
 They cannot be private.
They are automatically called by new operator

Which of the following operators are overloaded by default by the compiler?
1) Comparison Operator ( == )
2) Assignment Operator ( = )

In C++, const qualifier can be applied to
Member functions of a class
Function arguments
To a class data member which is declared as static
Reference variables

What will be the values of x, m and n after execution of the following statements? Int x, m, n;
m=10; n=15;
x= ++m + n++;

#include <iostream>
using namespace std;
int main()
{
int a;
a = 5 + 3 * 5;
cout <<a; return 0;
}

Which of the following statements is correct for a static member function?
1. It can access only other static members of its class.
 It can be called using the class name, instead of objects

Predict the output of following C++ program
#include<iostream> using namespace std;
class Empty {}; int main()
{
cout <<sizeof(Empty); return 0;
}

class Test { int x;
};
int main()
{
Test t; cout <<t.x; return 0;
}

Predict the output?
#include <iostream> using namespace std;
class Test
{
int x;
Test() { x = 5;}
};
int main()
{
Test *t = new Test; cout <<t->x;
}

Is it fine to call delete twice for a pointer?
#include<iostream> using namespace std;
int main()
{
int *ptr = new int; delete ptr;
delete ptr; return 0;
}

Output of following program?
#include<iostream> using namespace std; class Point {
Point() { cout <<"Constructor called"; }
};
int main()
{
Point t1; return 0;
}

#include<iostream> using namespace std; class Point {
public:
Point() { cout <<"Constructor called"; }
};
int main()
{
Point t1, *t2; return 0;
}

#include<iostream> using namespace std;
class X
{
public:
int x;
};
int main()
{
X a = {10};
X b = a;
cout <<a.x <<" " <<b.x; return 0;
}