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MCQOPTIONS
This section includes 916 Mcqs, each offering curated multiple-choice questions to sharpen your Technical Programming knowledge and support exam preparation. Choose a topic below to get started.
| 751. |
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 | |
| 752. |
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» D. ~C() then ~A() then ~B() | |
| 753. |
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 | |
| 754. |
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. | |
| 755. |
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 | |
| 756. |
The destructor can be called before the constructor if required. (True/False) |
| A. | True |
| B. | False |
| Answer» C. | |
| 757. |
The destructors ____________ |
| A. | Have a return type |
| B. | May have a return type |
| C. | Of derived classes have return type |
| D. | Doesn’t have a return type |
| Answer» E. | |
| 758. |
The constructor _____________ |
| A. | Have a return type |
| B. | May have a return type |
| C. | Of derived classes have return type |
| D. | Doesn’t have a return type |
| Answer» E. | |
| 759. |
Which among the following is true for destructors? |
| A. | Destructors can be overloaded |
| B. | Destructors can be define more than one time |
| C. | Destructors can’t be overloaded |
| D. | Destructors are overloaded in derived classes |
| Answer» D. Destructors are overloaded in derived classes | |
| 760. |
If a class have 4 constructors then it must have 4 destructors also. |
| A. | True |
| B. | False |
| Answer» C. | |
| 761. |
For explicit call _________________ |
| A. | The destructor must be private |
| B. | The destructor must be public |
| C. | The destructor must be protected |
| D. | The destructor must be defined outside the class |
| Answer» C. The destructor must be protected | |
| 762. |
Number of destructors called are |
| A. | Always equal to number of constructors called |
| B. | Always less than the number of constructors called |
| C. | Always greater than the number of constructors called |
| D. | Always less than or equal to number of constructors |
| Answer» B. Always less than the number of constructors called | |
| 763. |
Destructor calls ________________ (C++) |
| A. | Are only implicit |
| B. | Are only explicit |
| C. | Can be implicit or explicit |
| D. | Are made at end of program only |
| Answer» D. Are made at end of program only | |
| 764. |
The destructors _____________________ |
| A. | Can have maximum one argument |
| B. | Can’t have any argument |
| C. | Can have more than one argument |
| D. | Can’t have more than 3 arguments |
| Answer» C. Can have more than one argument | |
| 765. |
What is the sequence of destructors call? |
| A. | Same order as that of the constructors call |
| B. | Random order |
| C. | Random order |
| D. | Revere of the order of constructor call |
| Answer» E. | |
| 766. |
Which among the following is correct syntax for the destructors? |
| A. | classname() |
| B. | ()classname |
| C. | ~classname() |
| D. | -classname() |
| Answer» D. -classname() | |
| 767. |
Which among the following represents correct constructor? |
| A. | ()classname |
| B. | ~classname() |
| C. | –classname() |
| D. | classname() |
| Answer» E. | |
| 768. |
Which among the following best describes destructor? |
| A. | A function which is called just before the objects are destroyed |
| B. | A function which is called after each reference to the object |
| C. | A function which is called after termination of the program |
| D. | A function which is called before calling any member function |
| Answer» B. A function which is called after each reference to the object | |
| 769. |
Which among the following best describes the constructors? |
| A. | A function which is called whenever an object is referenced |
| B. | A function which is called whenever an object is created to initialize the members |
| C. | A function which is called whenever an object is assigned to copy the values |
| D. | A function which is called whenever an object is to be given values for members |
| Answer» C. A function which is called whenever an object is assigned to copy the values | |
| 770. |
Which is correct syntax? |
| A. | classname objectname= new() integer; |
| B. | classname objectname= new classname; |
| C. | classname objectname= new classname(); |
| D. | classname objectname= new() classname(); |
| Answer» D. classname objectname= new() classname(); | |
| 771. |
What is we only create an object but don’t call any constructor for it in java? |
| A. | Implicit constructor will be called |
| B. | Object is initialized to some null values |
| C. | Object is not created |
| D. | Object is created but points to null |
| Answer» E. | |
| 772. |
Which among the following is not valid in java? |
| A. | Constructor overloading |
| B. | Recursive constructor call |
| C. | Default value constructors |
| D. | String argument constructor |
| Answer» C. Default value constructors | |
| 773. |
If programmer have defined parameterized constructor only, then __________________ |
| A. | Default constructor will not be created by the compiler implicitly |
| B. | Default constructor will be created by the compiler implicitly |
| C. | Default constructor will not be created but called at runtime |
| D. | Compile time error |
| Answer» B. Default constructor will be created by the compiler implicitly | |
| 774. |
Why do we use constructor overloading? |
| A. | To use different types of constructors |
| B. | Because it’s a feature provided |
| C. | To initialize the object in different ways |
| D. | To differentiate one constructor from another |
| Answer» D. To differentiate one constructor from another | |
| 775. |
Which among the following function can be used to call default constructor implicitly in java? |
| A. | this() |
| B. | that() |
| C. | super() |
| D. | sub() |
| Answer» B. that() | |
| 776. |
When is the constructor called for an object? |
| A. | As soon as overloading is required |
| B. | As soon as class is derived |
| C. | As soon as class is created |
| D. | As soon as object is created |
| Answer» E. | |
| 777. |
Which among the following is false for a constructor? |
| A. | Constructors doesn’t have a return value |
| B. | Constructors are always user defined |
| C. | Constructors are overloaded with different signature |
| D. | Constructors may or may not have any arguments being accepted |
| Answer» C. Constructors are overloaded with different signature | |
| 778. |
Which among the following is possible way to overload constructor? |
| A. | Define default constructor, 1 parameter constructor and 2 parameter constructor |
| B. | Define default constructor, zero argument constructor and 1 parameter constructor |
| C. | Define default constructor, and 2 other parameterized constructors with same signature |
| D. | Define 2 default constructors |
| Answer» B. Define default constructor, zero argument constructor and 1 parameter constructor | |
| 779. |
Does constructor overloading include different return types for constructors to be overloaded? |
| A. | Yes, if return types are different, signature becomes different |
| B. | Yes, because return types can differentiate two functions |
| C. | No, return type can’t differentiate two functions |
| D. | No, constructors doesn’t have any return type |
| Answer» E. | |
| 780. |
Can constructors be overloaded in derived class? |
| A. | Yes, always |
| B. | Yes, if derived class has no constructor |
| C. | No, programmer can’t do it |
| D. | No, never |
| Answer» E. | |
| 781. |
Which among the following best describes constructor overloading? |
| A. | Defining one constructor in each class of a program |
| B. | Defining more than one constructor in single class |
| C. | Defining more than one constructor in single class with different signature |
| D. | Defining destructor with each constructor |
| Answer» D. Defining destructor with each constructor | |
| 782. |
Copy constructors are overloaded constructors. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 783. |
The arguments to a copy constructor _____________ |
| A. | Must be const |
| B. | Must not be cosnt |
| C. | Must be integer type |
| D. | Must be static |
| Answer» B. Must not be cosnt | |
| 784. |
Can a copy constructor be made private? |
| A. | Yes, always |
| B. | Yes, if no other constructor is defined |
| C. | No, never |
| D. | No, private members can’t be accessed |
| Answer» B. Yes, if no other constructor is defined | |
| 785. |
The deep copy is possible only with the help of __________ |
| A. | Implicit copy constructor |
| B. | User defined copy constructor |
| C. | Parameterized constructor |
| D. | Default constructor |
| Answer» C. Parameterized constructor | |
| 786. |
Copy constructor will be called whenever the compiler __________ |
| A. | Generates implicit code |
| B. | Generates member function calls |
| C. | enerates temporary object |
| D. | Generates object operations |
| Answer» D. Generates object operations | |
| 787. |
Out of memory error is given when the object _____________ to the copy constructor. |
| A. | Is passed with & symbol |
| B. | Is passed by reference |
| C. | Is passed as |
| D. | Is not passed by reference |
| Answer» E. | |
| 788. |
Object being passed to a copy constructor ___________ |
| A. | Must be passed by reference |
| B. | Must be passed by value |
| C. | Must be passed with integer type |
| D. | Must not be mentioned in parameter list |
| Answer» B. Must be passed by value | |
| 789. |
What is the syntax of copy constructor? |
| A. | classname (classname &obj){ /*constructor definition*/ } |
| B. | classname (cont classname obj){ /*constructor definition*/ } |
| C. | classname (cont classname &obj){ /*constructor definition*/ } |
| D. | classname (cont &obj){ /*constructor definition*/ } |
| Answer» D. classname (cont &obj){ /*constructor definition*/ } | |
| 790. |
If a class implements some dynamic memory allocations and pointers then _____________ |
| A. | Copy constructor must be defined |
| B. | Copy constructor must not be defined |
| C. | Copy constructor can’t be defined |
| D. | Copy constructor will not be used |
| Answer» B. Copy constructor must not be defined | |
| 791. |
If programmer doesn’t define any copy constructor then _____________ |
| A. | Compiler provides an implicit copy constructor |
| B. | Compiler gives an error |
| C. | The objects can’t be assigned with another objects |
| D. | The program gives run time error if copying is used |
| Answer» B. Compiler gives an error | |
| 792. |
Which returning an object, we can use ____________ |
| A. | Default constructor |
| B. | Zero argument constructor |
| C. | Parameterized constructor |
| D. | Copy constructor |
| Answer» E. | |
| 793. |
The copy constructors can be used to ________ |
| A. | Copy an object so that it can be passed to a class |
| B. | Copy an object so that it can be passed to a function |
| C. | Copy an object so that it can be passed to another primitive type variable |
| D. | Copy an object for type casting |
| Answer» C. Copy an object so that it can be passed to another primitive type variable | |
| 794. |
If two classes have exactly same data members and member function and only they differ by class name. Can copy constructor be used to initialize one class object with another class object? |
| A. | Yes, possible |
| B. | Yes, because the members are same |
| C. | No, not possible |
| D. | No, but possible if constructor is also same |
| Answer» D. No, but possible if constructor is also same | |
| 795. |
The copy constructor can be used to: |
| A. | Initialize one object from another object of same type |
| B. | Initialize one object from another object of different type |
| C. | Initialize more than one object from another object of same type at a time |
| D. | Initialize all the objects of a class to another object of another class |
| Answer» B. Initialize one object from another object of different type | |
| 796. |
Copy constructor is a constructor which ________________ |
| A. | Creates an object by copying values from any other object of same class |
| B. | Creates an object by copying values from first object created for that class |
| C. | Creates an object by copying values from another object of another class |
| D. | Creates an object by initializing it with another previously created object of same class |
| Answer» E. | |
| 797. |
If constructors of a class are defined in private access, then: |
| A. | The class can’t be inherited |
| B. | The class can be inherited |
| C. | Instance can be created only in another class |
| D. | Instance can be created anywhere in the program |
| Answer» B. The class can be inherited | |
| 798. |
When is the static constructor called? |
| A. | After the first instance is created |
| B. | Before default constructor call of first instance |
| C. | Before first instance is created |
| D. | At time of creation of first instance |
| Answer» D. At time of creation of first instance | |
| 799. |
Default constructor initializes all data members as: |
| A. | All numeric member with some garbage values and string to random string |
| B. | All numeric member with some garbage values and string to null |
| C. | All numeric member with zero and strings to random value |
| D. | All numeric member with zero and strings to null |
| Answer» E. | |
| 800. |
Within a class, only one static constructor can be created. |
| A. | True |
| B. | False |
| Answer» B. False | |