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MCQOPTIONS
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. | |
| 2. |
#include using namespace std; class Point { public: Point() { cout |
| A. | compiler error |
| B. | constructor called constructor called |
| C. | constructor called |
| Answer» D. | |
| 3. |
Output of following program? #include using namespace std; class Point { Point() { cout |
| A. | compile time error |
| B. | run time error |
| C. | constructor called |
| Answer» B. run time error | |
| 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. | |
| 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. | |
| 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. | |
| 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. | |
| 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 | |
| 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 | |
| 10. |
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. | |
| 11. |
class Test { int x; }; int main() { Test t; cout |
| A. | 0 |
| B. | garbage value |
| C. | compile time error |
| Answer» D. | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 18. |
Which of the following data type does not return anything? |
| A. | int |
| B. | short |
| C. | long |
| D. | void |
| Answer» E. | |
| 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 | |
| 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 | |
| 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. | |
| 22. |
Which of the following approach is adopted in C++? |
| A. | top down |
| B. | bottom up |
| C. | horizontal |
| D. | vertical |
| Answer» C. horizontal | |
| 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. | |
| 24. |
C++ was originally developed by …....... |
| A. | donald knuth |
| B. | bjarne sroustrups |
| C. | dennis ritchie |
| D. | none of these |
| Answer» C. dennis ritchie | |
| 25. |
In object oriented programming the focus is on …....... |
| A. | data |
| B. | structure |
| C. | function |
| D. | pointers |
| Answer» B. structure | |
| 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 | |
| 27. |
In procedural programming the focus in on …........... |
| A. | data |
| B. | structure |
| C. | function |
| D. | pointers |
| Answer» D. pointers | |
| 28. |
Which operator is having the highest precedence? |
| A. | postfix |
| B. | unary |
| C. | shift |
| D. | equality |
| Answer» B. unary | |
| 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 | |
| 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. | |
| 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 | |
| 32. |
Which of the following is the correct class of the object cout? |
| A. | iostream |
| B. | istream |
| C. | ostream |
| D. | ifstream |
| Answer» D. ifstream | |
| 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. | |
| 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 | |
| 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 | |
| 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 | |
| 37. |
Functions can returns |
| A. | arrays |
| B. | references |
| C. | objects |
| D. | all of above |
| Answer» E. | |
| 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. | |
| 39. |
The following is the C++ style comment |
| A. | // |
| B. | /*..*/ |
| C. | – |
| D. | none of above |
| Answer» B. /*..*/ | |
| 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 | |
| 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 | |
| 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. | |
| 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 | |
| 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 | |
| 45. |
What will be the output of following program? #include using namespace std; class Test{ public: Test() { cout |
| 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 | |
| 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. | |
| 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 | |
| 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 | |
| 49. |
The operators that cannot be overloaded is |
| A. | * |
| B. | - |
| C. | :: |
| D. | () |
| Answer» D. () | |
| 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 | |