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.

1.

#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
2.

#include 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» D.
Discussion
3.

Output of following program? #include 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» B. run time error
Discussion
4.

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» E.
Discussion
5.

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
6.

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
7.

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» D.
Discussion
8.

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

A. compile time error
B. garbage
C. 5
Answer» B. garbage
Discussion
9.

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» D. all 1,2,3
Discussion
10.

Which of the following is true about the following program #include 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: "<

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
11.

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

A. 0
B. garbage value
C. compile time error
Answer» D.
Discussion
12.

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

A. a non zero value
B. 0
C. compile time error
D. runtime error
Answer» B. 0
Discussion
13.

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» C. all members of a structure are public and structures don't have virtual functions
Discussion
14.

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
15.

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» B. preprocessing error
Discussion
16.

Which of the following statements is correct for a static member function? 1. It can access only other static members of its class. ï‚· 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» D. both 1 and 2 are incorrect
Discussion
17.

How many objects can be created from an abstract class?

A. zero
B. one
C. two
D. as many as we want
Answer» B. one
Discussion
18.

Which of the following data type does not return anything?

A. int
B. short
C. long
D. void
Answer» E.
Discussion
19.

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
20.

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
21.

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

A. class and object
B. encapsulation
C. abstraction
D. inheritance
Answer» E.
Discussion
22.

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

A. top down
B. bottom up
C. horizontal
D. vertical
Answer» C. horizontal
Discussion
23.

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» E.
Discussion
24.

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

A. donald knuth
B. bjarne sroustrups
C. dennis ritchie
D. none of these
Answer» C. dennis ritchie
Discussion
25.

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

A. data
B. structure
C. function
D. pointers
Answer» B. structure
Discussion
26.

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» B. functions share global data
Discussion
27.

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

A. data
B. structure
C. function
D. pointers
Answer» D. pointers
Discussion
28.

Which operator is having the highest precedence?

A. postfix
B. unary
C. shift
D. equality
Answer» B. unary
Discussion
29.

#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
30.

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
31.

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» B. this.x
Discussion
32.

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

A. iostream
B. istream
C. ostream
D. ifstream
Answer» D. ifstream
Discussion
33.

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» E.
Discussion
34.

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

A. top-down
B. bottom-up
C. right-left
D. left-right
Answer» C. right-left
Discussion
35.

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» D. x=27, m=11, n=16
Discussion
36.

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» D. neither a nor b
Discussion
37.

Functions can returns

A. arrays
B. references
C. objects
D. all of above
Answer» E.
Discussion
38.

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» E.
Discussion
39.

The following is the C++ style comment

A. //
B. /*..*/
C. –
D. none of above
Answer» B. /*..*/
Discussion
40.

Which type is best suited to represent the logical values?

A. integer
B. boolean
C. character
D. all of the mentioned
Answer» C. character
Discussion
41.

In C++, const qualifier can be applied to ï‚·Member functions of a class ï‚·Function arguments ï‚·To a class data member which is declared as static ï‚·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
42.

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
43.

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
44.

Which of the following is true about constructors. ï‚·They cannot be virtual. ï‚· They cannot be private. ï‚·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
45.

What will be the output of following program? #include 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» D. compiler error: global objects are not allowed
Discussion
46.

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
47.

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
48.

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
49.

The operators that cannot be overloaded is

A. *
B. -
C. ::
D. ()
Answer» D. ()
Discussion
50.

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