Explore topic-wise MCQs in Computer Science Engineering (CSE).

This section includes 97 Mcqs, each offering curated multiple-choice questions to sharpen your Computer Science Engineering (CSE) knowledge and support exam preparation. Choose a topic below to get started.

51.

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» D. both a and b
Discussion
52.

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

A. 0
B. -1
C. 999
D. -999
Answer» B. -1
Discussion
53.

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
54.

What will be the output of the program?

A. 1
B. default value
C. will not compile
D. none of the above
Answer» D. none of the above
Discussion
55.

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» C. invalid conversion from int to float
Discussion
56.

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
57.

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» E.
Discussion
58.

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

A. true
B. false
Answer» C.
Discussion
59.

What is value of size?

A. 28
B. 32
C. 20
D. 24
Answer» D. 24
Discussion
60.

Can destuctors be private in C++?

A. yes
B. no
Answer» B. no
Discussion
61.

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» E.
Discussion
62.

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

A. true
B. false
Answer» B. false
Discussion
63.

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

A. true
B. false
Answer» C.
Discussion
64.

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
65.

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

A. true
B. false
Answer» B. false
Discussion
66.

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
67.

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
68.

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
69.

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
70.

How many values can be returned from a function?

A. 0
B. 1
C. 2
D. 3
Answer» C. 2
Discussion
71.

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
72.

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

A. true
B. false
Answer» C.
Discussion
73.

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» D. a value returned by the function to the calling program.
Discussion
74.

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» E.
Discussion
75.

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
76.

A variable of type char can hold the value 301.

A. true
B. false
Answer» C.
Discussion
77.

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

A. true
B. false
Answer» B. false
Discussion
78.

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» E.
Discussion
79.

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
80.

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
81.

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
82.

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» B. in the class of which it is a member.
Discussion
83.

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
84.

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» C.
Discussion
85.

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

A. explicit
B. public
C. implicit
D. private
Answer» D. private
Discussion
86.

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» B. class b first class a next
Discussion
87.

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
88.

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» D. a function automatically called whenever a new object of this class is destroyed.
Discussion
89.

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
90.

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
91.

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

A. ::
B. ?
C. :?
D. %
Answer» B. ?
Discussion
92.

There is nothing like a virtual constructor of a class.

A. true
B. false
Answer» C.
Discussion
93.

The default access level assigned to members of a class is

A. private
B. public
C. protected
D. needs to be assigned
Answer» B. public
Discussion
94.

An abstract class can be instantiated.

A. true
B. false
Answer» C.
Discussion
95.

Can constructors be overloaded?

A. true
B. false
Answer» B. false
Discussion
96.

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» D. by default all the struct members are public while by default class members are protected.
Discussion
97.

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

A. true
B. false
Answer» B. false
Discussion