MCQOPTIONS
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MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Object Oriented Programming knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What happens when an object is passed by reference? |
| A. | Destructor is not called |
| B. | Destructor is called at end of function |
| C. | Destructor is called when function is out of scope |
| D. | Destructor is called when called explicitly |
| Answer» B. Destructor is called at end of function | |
| 2. |
When an object is passed to a function, its copy is made in the function and then ______________ |
| A. | The destructor of the copy is called when function is returned |
| B. | The destructor is never called in this case |
| C. | The destructor is called but it is always implicit |
| D. | The destructor must be user defined |
| Answer» B. The destructor is never called in this case | |
| 3. |
Which class destructor will be called first, when following code go out of scope? |
| A. | ~A() |
| B. | ~B() |
| C. | ~C() |
| D. | ~B() and ~C()View Answer |
| Answer» D. ~B() and ~C()View Answer | |
| 4. |
Which among the following is correct for the destructors concept? |
| A. | Destructors can be overloaded |
| B. | Destructors can have only one parameter at maximum |
| C. | Destructors are always called after object goes out of scope |
| D. | There can be only one destructor in a class |
| Answer» E. | |
| 5. |
When is it advised to have user defined destructor? |
| A. | When class contains some pointer to memory allocated in class |
| B. | When a class contains static variables |
| C. | When a class contains static functions |
| D. | When a class is inheriting another class only |
| Answer» B. When a class contains static variables | |
| 6. |
Global destructors execute in ___________ order after main function is terminated. |
| A. | Sequential |
| B. | Random |
| C. | Reverse |
| D. | Depending on priority |
| Answer» D. Depending on priority | |
| 7. |
Destructors can be ________ |
| A. | Abstract type |
| B. | Virtual |
| C. | Void |
| D. | Any type depending on situation |
| Answer» C. Void | |
| 8. |
Destructors doesn’t accept parameters. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
How the constructors and destructors can be differentiated? |
| A. | Destructor have a return type but constructor doesn’t |
| B. | Destructors can’t be defined by the programmer, but constructors can be defined |
| C. | Destructors are preceded with a tilde (~) symbol, and constructor doesn’t |
| D. | Destructors are same as constructors in syntax |
| Answer» D. Destructors are same as constructors in syntax | |
| 10. |
When is the destructor of a global object called? |
| A. | Just before end of program |
| B. | Just after end of program |
| C. | With the end of program |
| D. | Anytime when object is not needed |
| Answer» B. Just after end of program | |
| 11. |
Choose the correct sequence of destructors being called for the following code. |
| A. | ~A(), ~B(), ~C() |
| B. | ~B(), ~C(), ~A() |
| C. | ~A(), ~C(), ~B() |
| D. | ~C(), ~B(), ~A()View Answer |
| Answer» E. | |
| 12. |
If in multiple inheritance, class C inherits class B, and Class B inherits class A. In which sequence are their destructors called if an object of class C was declared? |
| A. | ~C() then ~B() then ~A() |
| B. | ~B() then ~C() then ~A() |
| C. | ~A() then ~B() then ~C() |
| D. | ~C() then ~A() then ~B() |
| Answer» B. ~B() then ~C() then ~A() | |
| 13. |
Which among the following is correct for abstract class destructors? |
| A. | It doesn’t have destructors |
| B. | It has destructors |
| C. | It may or may not have destructors |
| D. | It contains an implicit destructor |
| Answer» B. It has destructors | |
| 14. |
When a destructor is called? |
| A. | After the end of object life |
| B. | Anytime in between object’s lifespan |
| C. | At end of whole program |
| D. | Just before the end of object life |
| Answer» E. | |
| 15. |
Which among the following describes a destructor? |
| A. | A special function that is called to free the resources, acquired by the object |
| B. | A special function that is called to delete the class |
| C. | A special function that is called anytime to delete an object |
| D. | A special function that is called to delete all the objects of a class |
| Answer» B. A special function that is called to delete the class | |
| 16. |
DESTRUCTORS_CAN_BE_________?$ |
| A. | Abstract type |
| B. | Virtual |
| C. | Void |
| D. | Any type depending on situation |
| Answer» C. Void | |
| 17. |
When is it advised to have user defined destructor?$ |
| A. | When class contains some pointer to memory allocated in class |
| B. | When a class contains static variables |
| C. | When a class contains static functions |
| D. | When a class is inheriting another class only |
| Answer» B. When a class contains static variables | |
| 18. |
Global_destructors_execute_in_____________order_after_main_function_is_terminated$ |
| A. | Sequential |
| B. | Random |
| C. | Reverse |
| D. | Depending on priority |
| Answer» D. Depending on priority | |
| 19. |
~A() |
| A. | ~B() |
| B. | ~C() |
| C. | ~B() and ~C() |
| Answer» B. ~C() | |
| 20. |
Destructors doesn’t accept parameters?# |
| A. | True |
| B. | False |
| Answer» B. False | |