81 + Mcqs in Object Oriented Programming Page 1 McqOptions

1.	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» E.

Discussion

2.	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» B. private

Discussion

3.	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» E.

Discussion

4.	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» E.

Discussion

5.	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» E.

Discussion

6.	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» D. only to public members of the class.

Discussion

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

Discussion

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

Discussion

9.	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» B. only display()

Discussion

10.	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» E.

Discussion

11.	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» E.

Discussion

12.	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» E.

Discussion

13.	#include using namespace std; class Point {public:Point() { cout
A.	compiler error
B.	constructor called constructor called
C.	constructor called
Answer» D.

Discussion

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

Discussion

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

Discussion

16.	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» B. false

Discussion

17.	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» E.

Discussion

18.	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» E.

Discussion

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

Discussion

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

Discussion

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

Discussion

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

Discussion

23.	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» C.

Discussion

24.	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» D. to help in modular programming

Discussion

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

Discussion

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

Discussion

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

Discussion

28.	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» D. none of the two

Discussion

29.	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» C. data encapsulation

Discussion

30.	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» D. both a and b

Discussion

31.	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» E.

Discussion

32.	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» E.

Discussion

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

Discussion

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

Discussion

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

Discussion

36.	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» D. only 1, 3 and 4

Discussion

37.	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» C. objects

Discussion

38.	#include using namespace std; int main(){int a;a = 5 + 3 * 5;cout
A.	35
B.	20
C.	25
D.	30
Answer» C. 25

Discussion

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

Discussion

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

Discussion

41.	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» B. false

Discussion

42.	Which of the following is true about the following program#include class Test{public:int i;void get();};void Test::get(){std::cout i;}Test t; // Global object int main(){Test t; // local object t.get();std::cout
A.	compiler error: cannot have two objects with same class name
B.	compiler error in line "::t.get();"
C.	compiles and runs fine
Answer» D.

Discussion

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

Discussion

44.	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» E.

Discussion

45.	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» C. only 1 and 2

Discussion

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

Discussion

47.	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» E.

Discussion

48.	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» E.

Discussion

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

Discussion

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

Discussion

Explore topic-wise MCQs in Object Oriented System Design.

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

Which of the following interface determines how your program will be used by other program?

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

When an argument is passed by reference

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

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

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

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

Which function will change the state of the object?

What value will be printed for data.i?

A static local variable is used to

Under what conditions a destructor destroys an object?

#include using namespace std; class Point {public:Point() { cout

#include using namespace std;class X{public:int x;};int main(){X a = {10};X b = a;cout

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.

Overloaded functions

Which of the followings is/are automatically added to every class, if we do not write our own.

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

Can constructors be overloaded?

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

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

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

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

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

Functions can returns

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

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

If particular software can be used in some other application than the one for which it is created then it reveals ….........

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

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

Dividing a program into functions

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

The operators that cannot be overloaded is

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

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

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

#include using namespace std; int main(){int a;a = 5 + 3 * 5;cout

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

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

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

Which of the following is true about the following program#include class Test{public:int i;void get();};void Test::get(){std::cout i;}Test t; // Global object int main(){Test t; // local object t.get();std::cout

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

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

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 allow defining the member functions of a class outside the class?

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

Classes are useful because they

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

What is value of size?