Object Oriented Programming MCQs

Id	1
Question	Every class has at least one constructor function, even when none is declared.
A	TRUE
B	FALSE
C
D
Answer	A
Marks	1
Unit	I

Id	2
Question	Can constructors be overloaded?
A	TRUE
B	FALSE
C
D
Answer	A
Marks	1
Unit	I

Id	3
Question	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
Marks	1
Unit	I

Id	4
Question	An abstract class can be instantiated.
A	TRUE
B	FALSE
C
D
Answer	B
Marks	1
Unit	I

Id	5
Question	The default access level assigned to members of a class is ______
A	Private
B	Public
C	Protected
D	Needs to be assigned
Answer	A
Marks	1
Unit	I

Id	6
Question	There is nothing like a virtual constructor of a class.
A	TRUE
B	FALSE
C
D
Answer	B
Marks	1
Unit	I

Id	7
Question	Which of the following operators allow defining the member functions of a class outside the class?
A	::
B	?
C	:?
D	%
Answer	A
Marks	1
Unit	I

Id	8
Question	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
Marks	1
Unit	I

Id	9
Question	Which one of the following is not a fundamental data type in C++?
A	Float
B	string
C	Int
D	Char
Answer	B
Marks	1
Unit	I

Id	10
Question	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
Marks	1
Unit	I

Id	11
Question	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
Marks	1
Unit	I

Id	12
Question	If a member needs to have unique value for all the objects of that same class, declare the member as
A	Global variable outside class
B	Local variable inside constructor
C	Static variable inside class
D	Dynamic variable inside class
Answer	B
Marks	1
Unit	I

Id	13
Question	If a member needs to have unique value for all the objects of that same class, declare the member as
A	Global variable outside class
B	Local variable inside constructor
C	Static variable inside class
D	Dynamic variable inside class
Answer	B
Marks	1
Unit	I

Id	14
Question	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
Marks	1
Unit	I

Id	15
Question	Which one of the following is not a valid reserved keyword in C++?
A	Explicit
B	Public
C	Implicit
D	Private
Answer	C
Marks	1
Unit	I

Id	16
Question	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
C
D
Answer	B
Marks	1
Unit	I

Id	17
Question	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
Marks	1
Unit	I

Id	18
Question	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
Marks	1
Unit	I

Id	19
Question	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
Marks	1
Unit	I

Id	20
Question	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
Marks	1
Unit	I

Id	21
Question	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
Marks	2
Unit	I

Id	22
Question	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
Marks	2
Unit	I

Id	23
Question	A variable of type char can hold the value 301.
A	TRUE
B	FALSE
C
D
Answer	B
Marks	1
Unit	I

Id	24
Question	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
C
D
Answer	B
Marks	1
Unit	I

Id	25
Question	It’s perfectly all right to use variables of different data types in the same arithmetic expression.
A	TRUE
B	FALSE
C
D
Answer	A
Marks	1
Unit	I

Id	26
Question	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
Marks	1
Unit	I

Id	27
Question	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
Marks	1
Unit	I

Id	28
Question	When arguments are passed by value, the function works with the original arguments in the calling program.
A	TRUE
B	FALSE
C
D
Answer	B
Marks	1
Unit	I

Id	29
Question	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
Marks	1
Unit	I

Id	30
Question	How many values can be returned from a function?
A	0
B	1
C	2
D	3
Answer	B
Marks	1
Unit	I

Id	31
Question	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
C
D
Answer	A
Marks	1
Unit	I

Id	32
Question	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
Marks	1
Unit	I

Id	33
Question	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
Marks	2
Unit	I

Id	34
Question	A default argument has a value that
A	may be supplied by the calling program.
B	may be supplied by the function.
C	must have a constant value.
D	A and B
Answer	1
Marks	1
Unit	I

Id	35
Question	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
Marks	2
Unit	I

Id	36
Question	In C++ there can be an array of four dimensions.
A	TRUE
B	FALSE
C
D
Answer	A
Marks	1
Unit	I

Id	37
Question	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
Marks	1
Unit	I

Id	38
Question	The compiler will complain if you try to access array element 14 in a 10-element array.
A	TRUE
B	FALSE
C
D
Answer	B
Marks	1
Unit	I

Id	39
Question	The extraction operator (>>) stops reading a string when it encounters a space.
A	TRUE
B	FALSE
C
D
Answer	A
Marks	1
Unit	I

Id	40
Question	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
Marks	1
Unit	I

Id	41
Question	You should prefer C-strings to the Standard C++ string class in new programs.
A	TRUE
B	FALSE
C
D
Answer	B
Marks	1
Unit	I

Id	42
Question	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
Marks	1
Unit	I

Id	43
Question	Can destuctors be private in C++?
A	Yes
B	No
C
D
Answer	A
Marks	1
Unit	I

Id	44
Question	What is value of size?
A	28
B	32
C	20
D	24
Answer	C
Marks	1
Unit	I

Id	45
Question	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
Marks	1
Unit	I

Id	46
Question
A	25
B	30
C	9
D	3
Answer	B
Marks	1
Unit	I

Id	47
Question
A	1
B	3
C	4
D	6
Answer	A
Marks	1
Unit	I

Id	48
Question	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
Marks	2
Unit	I

Id	49
Question
A	45
B	55
C	Array Sum: 45
D	Will not compile
Answer	D
Marks	2
Unit	I

Id	50
Question
A	5
B	20
C	15
D	Unpredictable value
Answer	B
Marks	1
Unit	I

Id	51
Question
A	only 2
B	only 1
C	both 1 &2
D	None of the above
Answer	B
Marks	2
Unit	I

Id	52
Question
A	call-2
B	call-1
C	call-3
D	call-1, call-2
Answer	B
Marks	1
Unit	I

Id	53
Question	What will be the output of the program?
A	1
B	Default value
C	Will not compile
D	None of the above
Answer	C
Marks	1
Unit	I

Id	54
Question	What is the output of the program?
A	0 0
B	x = 0 y = 0
C	0
D	Compilation error
Answer	D
Marks	1
Unit	I

Id	55
Question	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
Marks	2
Unit	I

Id	56
Question	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
Marks	2
Unit	I

Id	57
Question	The only integer that can be assigned directly to a pointer is _________
A	0
B	-1
C	999
D	-999
Answer	A
Marks	1
Unit	I

Id	58
Question	Which of the following feature is not supported by C++?
A	Exception Handling
B	Reflection
C	Operator Overloading
D	Namespace
Answer	B
Marks	1
Unit	I

Id	59
Question	Suppose aand bare integer variables and we form the sum a + b. Now suppose cand dare floating-point variables and we form the sum c + d.The two +operators here are clearly being used for different purposes. This is an example of ____________
A	Operator Overloading
B	Inheritance
C	Function Overloading
D	Constructor
Answer	A
Marks	1
Unit	I

Id	60
Question	The operators that cannot be overloaded is
A	*
B	-
C	::
D	()
Answer	C
Marks	1
Unit	I

Id	61
Question	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
C
D
Answer	A
Marks	1
Unit	I

Id	62
Question	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
Marks	1
Unit	I

Id	63
Question	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
Marks	1
Unit	I

Id	64
Question	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
Marks	2
Unit	I

Id	65
Question	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
Marks	1
Unit	I

Id	66
Question	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
Marks	1
Unit	I

Id	67
Question	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
Marks	1
Unit	I

Id	68
Question	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
Marks	1
Unit	I

Id	69
Question	In C++ ..................... operator is used for Dynamic memory allocation.
A	Scope resolution
B	Conditional
C	New
D	Membership access
Answer	C
Marks	1 M
Unit	I

Id	70
Question	What is the output of the program #include<iostream.h> void main() { int n=1; cout<<endl<<"The numbers are;"<<endl; do { cout <<n<<"\t"; n++; } while (n<=100); cout <<endl; }
A	Print natural numbers 0 to 99
B	Print natural numbers 1 to 99
C	Print natural numbers 0 to 100
D	Print natural numbers 1 to 100
Answer	D
Marks	2 M
Unit	I

Id	71
Question	Because the lifetime of a local variable is limited and determined automatically, these variables are also called
A	Automator
B	Automatic
C	Dynamic
D	Static
Answer	B
Marks	1 M
Unit	I

Id	72
Question	Which of the following header file includes definition of cin and cout?
A	istream.h
B	ostream.h
C	iomanip.h
D	iostream.h
Answer	D
Marks	1
Unit	I

Id	73
Question	Which of the following statements regarding inline functions is correct?
A	It speeds up execution
B	It slows down execution
C	It increases the code size
D	Both A and C.
Answer	D
Marks	1
Unit	I

Id	74
Question	Which of the following access specifier is used as a default in a class definition?
A	Public
B	Private
C	Protected
D	Friend
Answer	B
Marks	1
Unit	I

Id	75
Question	Which of the following statements is correct in C++?
A	Classes cannot have data as protected members.
B	Structures can have functions as members.
C	Class members are public by default.
D	Structure members are private by default.
Answer	B
Marks	1
Unit	I

Id	76
Question	cout is a/an __________
A	operator
B	Function
C	object
D	Macro
Answer	C
Marks	1
Unit	I

Id	77
Question	Which of the following concepts of OOPS means exposing only necessary information to client?
A	Encapsulation
B	Abstraction
C	Data hiding
D	Data binding
Answer	C
Marks	1
Unit	1

Id	78
Question	Which of the following keywords is used to control access to a class member?
A	Default
B	Break
C	Protected
D	Asm
Answer	C
Marks	1
Unit	1

Id	79
Question	Utility functions are also called as .......
A	Virtual function
B	Friend function
C	Helper function
D	None of above
Answer	C
Marks	1
Unit	1

Id	80
Question	......... is a member function with the same name as the class.
A	Friend function
B	Constructor
C	Destructor
D	None of above
Answer	B
Marks	1
Unit	1

Id	81
Question	Which is not the feature of constructor?
A	It cannot be inherited.
B	It should be declared in Private.
C	It do not have return type
D	All of above
Answer	B
Marks	1
Unit	1

Id	82
Question	Which is not type of constructor?
A	Default
B	Copy
C	Parameterized
D	None of above
Answer	D
Marks	1
Unit	1

Id	83
Question	Objects are destroyed in the reverse order of its creation.
A	True
B	False
C	-
D	-
Answer	A
Marks	1
Unit	1

Id	84
Question	.... constructor is used for copying the object of same class type.
A	Copy
B	Default
C	Parameterized
D	None of above
Answer	A
Marks	1
Unit	1

Id	85
Question	The function inside a class is called as .......
A	Class Function
B	Member Function
C	Method
D	All of above
Answer	B
Marks	1
Unit	1

Id	86
Question	Which operator is used to define member function of a class outside the class?
A	!
B	:
C	::
D	.
Answer	C
Marks	1
Unit	1

Id	87
Question	How many objects can be created by a class?
A	1
B	2
C	3
D	As Many as required
Answer	D
Marks	1
Unit	1

Id	88
Question	Default return type of C++ main( ) is .....
A	float
B	void
C	Int
D	Pointer
Answer	C
Marks	1
Unit	1

Id	89
Question	Enumerated data type is ........
A	User-defined data type
B	In-built data type
C	Derived data type
D	None of above
Answer	A
Marks	1
Unit	1

Id	90
Question	Attributes of a class are called as ........
A	Member functions
B	Data members
C	Objects
D	All of above
Answer	B
Marks	1
Unit	1

Id	91
Question	Class acquire space in memory.
A	True
B	False
C	-
D	-
Answer	B
Marks	1
Unit	1

Id	92
Question	In object-oriented programming ........ is more important.
A	Function
B	Procedure
C	Data
D	All of above
Answer	C
Marks	1
Unit	1

Id	93
Question	Object-oriented programming follows Top-down approach.
A	True
B	False
C	-
D	-
Answer	B
Marks	1
Unit	1

Id	94
Question	The following operators can not be overloaded
A	Unary operator
B	Binary operator
C	Ternary operator
D	None of the above
Answer	C
Marks	1
Unit	1

Id	95
Question	C++ does not supports the following
A	Multilevel inheritance
B	Hierarchical inheritance
C	Hybrid inheritance
D	None of the above
Answer	D
Marks	1
Unit	1

Id	96
Question	Which of the following is not the keyword in C++?
A	Volatile
B	Friend
C	Extends
D	This
Answer	C
Marks	1
Unit	1

Id	97
Question	Which data type can be used to hold a wide character in C++?
A	unsigned char;
B	Int
C	wchar_t
D	None of the above
Answer	C
Marks	1
Unit	1

Id	98
Question	Which type is best suited to represent the logical values?
A	integer
B	boolean
C	character
D	all of the mentioned
Answer	B
Marks	1
Unit	1

Id	99
Question	The following is the C++ style comment
A	//
B	/../
C	–
D	None of above
Answer	A
Marks	1
Unit	1

Id	100
Question	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
Marks	1
Unit	1

Id	101
Question	Which of the following statements regarding comments is false?
A	/../
B	Comment beginning with // extends to the end of the line
C	Comments may be nested
D	Comments are used to describe a program
Answer	C
Marks	1
Unit	1

Id	102
Question	The result of the following statement is int y = 7; int ans = ++y; cout<<”ans=”<<ans; cout<<”y”<<y;
A	ans=7, y=7
B	ans=8,y=7
C	ans=8,y=8;
D	None
Answer	C
Marks	1
Unit	1

Id	103
Question	Inline functions are
A	Declared in the class defined outside the class
B	Defined outside the class using keyword inline
C	Defined inside the class using keyword inline
D	None of the above
Answer	B
Marks	1
Unit	1

Id	104
Question	Functions can returns
A	Arrays
B	References
C	Objects
D	All of above
Answer	D
Marks	1
Unit	1

Id	105
Question	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
Marks	1
Unit	1

Id	106
Question	State true of false. i) We cannot make the function inline by defining a function outside the class. ii) A member function can be called by using its name inside another member function of the same class, this is known as nesting of member function.
A	True, True
B	True, False
C	False, True
D	False, False
Answer	C
Marks	1
Unit	1

Id	107
Question	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
Marks	2
Unit	1

Id	108
Question	How many types of polymorphisms are supported by C++?
A	1
B	2
C	3
D	4
Answer	B
Marks	1
Unit	1

Id	109
Question	Which of the following approach is adapted by C++?
A	Top-down
B	Bottom-up
C	Right-left
D	Left-right
Answer	B
Marks	1
Unit	1

Id	110
Question	Which of the following is the correct class of the object cout?
A	Iostream
B	istream
C	Ostream
D	Ifstream
Answer	C
Marks	1
Unit	1

Id	111
Question	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
Marks	1
Unit	1

Id	112
Question	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
Marks	1
Unit	1

Id	113
Question	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
Marks	1
Unit	1

Id	114
Question	Which operator is having the highest precedence?
A	Postfix
B	Unary
C	Shift
D	Equality
Answer	A
Marks	1
Unit	1

Id	115
Question	#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
Marks	2
Unit	1

Id	116
Question	#include <iostream> using namespace std; main() { double a = 21.09399; float b = 10.20; int c ,d; c = (int) a; d = (int) b; cout <<c <<' '<<d; return 0; }
A	20 10
B	10 21
C	21 10
D	None
Answer	A
Marks	2
Unit	1

Id	117
Question	#include <iostream> using namespace std; int main() { int num1 = 10; float num2 = 20; cout <<sizeof(num1 + num2); return 0; }
A	2
B	4
C	8
D	Garbage
Answer	B
Marks	2
Unit	1

Id	118
Question	#include <stdio.h> using namespace std; int array1[] = {1200, 200, 2300, 1230, 1543}; int array2[] = {12, 14, 16, 18, 20}; int temp, result = 0; int main() { for (temp = 0; temp <5; temp++) { result += array1[temp]; } for (temp = 0; temp <4; temp++) { result += array2[temp]; } cout <<result; return 0; }
A	6553
B	6533
C	6522
D	12200
Answer	B
Marks	2
Unit	1

Id	119
Question	In procedural programming the focus in on …...........
A	data
B	structure
C	function
D	pointers
Answer	C
Marks	1
Unit	1

Id	120
Question	In object oriented programming the focus is on ….......
A	data
B	structure
C	function
D	pointers
Answer	A
Marks	1
Unit	1

Id	121
Question	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
Marks	1
Unit	1

Id	122
Question	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
Marks	1
Unit	1

Id	123
Question	C++ was originally developed by ….......
A	Donald Knuth
B	Bjarne Sroustrups
C	Dennis Ritchie
D	None of these
Answer	B
Marks	1
Unit	1

Id	124
Question	Which of the following approach is adopted in C++?
A	Top down
B	Bottom up
C	Horizontal
D	Vertical
Answer	B
Marks	1
Unit	1

Id	125
Question	Which feature of C++ contain the concept of super class and subclass?
A	Class and object
B	Encapsulation
C	Abstraction
D	Inheritance
Answer	D
Marks	1
Unit	1

Id	126
Question	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
Marks	1
Unit	1

Id	127
Question	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
Marks	1
Unit	1

Id	128
Question	Which of the following data type does not return anything?
A	Int
B	short
C	long
D	void
Answer	D
Marks	1
Unit	1

Id	129
Question	How many objects can be created from an abstract class?
A	Zero
B	One
C	Two
D	As many as we want
Answer	A
Marks	1
Unit	1

Id	130
Question	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
Marks	1
Unit	1

Id	131
Question	Select the correct statement
	I. In procedural programming oriented language all the function calls are
	resolved at compile time.
	II. In object oriented programming language all function calls are
	resolved at compile time.
A	Only I
B	Only II
C	Both I and II
D	Neither I nor II
Answer	A
Marks	1
Unit	1

Id	132
Question	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
Marks	1
Unit	1

Id	133
Question	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
Marks	1
Unit	I

134

Question

What is the difference between struct and class in C++?

All members of a structure are public and structures don't have constructors and destructors

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.

All members of a structure are public and structures don't have virtual functions

All above

Answer

Marks

Unit

135

Question

Predict the output of following C++ program

#include<iostream>

using namespace std;

class Empty {};

int main()

{

cout <<sizeof(Empty);

return 0;

}

A non zero value

Compile time error

Runtime error

Answer

Marks

Unit

Id	136
Question	class Test { int x; }; int main() { Test t; cout <<t.x; return 0; }
A	0
B	Garbage value
C	Compile time error
D
Answer	C
Marks	1
Unit	I

Id	137
Question	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
Marks	1
Unit	I

138

Question

Assume that an integer and a pointer each takes 4 bytes. Also, assume that there is no alignment in objects. Predict the output following program.

#include<iostream>

using namespace std;

class Test

{

static int x;

int *ptr;

int y;

};

int main()

{

Test t;

cout <<sizeof(t) <<" ";

cout <<sizeof(Test *);

}

12 4

12 12

8 4

8 8

Answer

Marks

Unit

139

Question

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;

}

Compiler Error: Cannot have two objects with same class name

Compiler Error in Line "::t.get();"

Compiles and runs fine

Answer

Marks

Unit

Id	140
Question	How to create a dynamic array of pointers (to integers) of size 10 using new in C++? Hint: We can create a non-dynamic array using int *arr[10]
A	int arr = new int [10];
B	int *arr = new int [10];
C	int *arr = new int [10];
D	Not possible
Answer	1
Marks	1
Unit	I

Id	141
Question	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
Marks	1
Unit	I

142

Question

Predict the output?

#include <iostream>

using namespace std;

class Test

{

int x;

Test() { x = 5;}

};

int main()

{

Test *t = new Test;

cout <<t->x;

}

Compile time error

Garbage

Answer

Marks

Unit

143

Question

What happens when delete is used for a NULL pointer?

int *ptr = NULL;

delete ptr;

Compile time error

Run time error

No effect

Answer

Marks

Unit

144

Question

Is it fine to call delete twice for a pointer?

#include<iostream>

using namespace std;

int main()

{

int *ptr = new int;

delete ptr;

return 0;

}

Yes

Answer

Marks

Unit

Id	145
Question	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
Marks	1
Unit	I

Id	146
Question	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
Marks	1
Unit	I

147

Question

Output of following program?

#include<iostream>

using namespace std;

class Point {

Point() { cout <<"Constructor called"; }

};

int main()

{

Point t1;

return 0;

}

Compile time error

Run time error

Constructor called

Answer

Marks

Unit

Id	148
Question	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
Marks	1
Unit	I

Id	149
Question	#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
D
Answer	C
Marks	1
Unit	I

Id	150
Question	#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
Marks	1
Unit	I

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