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Object Oriented Programming Practice Test: Constructors and Destructors

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Avg score: 57% • Most missed: “How the constructors and destructors can be differentiated?”

Quiz on constructors and its types, copy constructor, overloading constructors, destructors, execution of constructor or destructor. In object-oriented programming (OOP), constructors and destructors are special member functions of a class that handle the initialization and cleanup of objects, respectively. Constructors are used to initialize objects of a class. They are called automatically when an object is created, and they can be used to set the initial values of the object's member variables. Destructors are used to clean up objects when they are destroyed. They are called... Show more

Quiz on constructors and its types, copy constructor, overloading constructors, destructors, execution of constructor or destructor.

In object-oriented programming (OOP), constructors and destructors are special member functions of a class that handle the initialization and cleanup of objects, respectively.
Constructors are used to initialize objects of a class. They are called automatically when an object is created, and they can be used to set the initial values of the object's member variables.
Destructors are used to clean up objects when they are destroyed. They are called automatically when an object goes out of scope, and they can be used to release any resources that the object was using.

Constructors and destructors are important tools for managing the lifecycle of objects in OOP. They can be used to ensure that objects are properly initialized and cleaned up, which can help to prevent memory leaks and other problems.

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Object Oriented Programming Practice Test: Constructors and Destructors

Time left 00:00

1. If programmer have defined parameterized constructor only, then __________________

Default constructor will not be created but called at runtimeCompile time errorDefault constructor will not be created by the compiler implicitlyDefault constructor will be created by the compiler implicitly

2. Can constructors be overloaded in derived class?

No, programmer can’t do itNo, neverYes, alwaysYes, if derived class has no constructor

3. Destructors can be ________

VirtualVoidAny type depending on situationAbstract type

4. In which access should a constructor be defined, so that object of the class can be created in any function?

ProtectedAny access specifier will workPrivatePublic

5. For explicit call _________________

The destructor must be publicThe destructor must be protectedThe destructor must be defined outside the classThe destructor must be private

6. Which among the following is called first, automatically, whenever an object is created?

TriggerConstructorClassNew

7. When is the constructor called for an object?

As soon as object is createdAs soon as class is createdAs soon as overloading is requiredAs soon as class is derived

8. Destructors doesn’t accept parameters.

TrueCan't SayFalseMaybe

9. Which among the following is possible way to overload constructor?

Define default constructor, zero argument constructor and 1 parameter constructorDefine default constructor, and 2 other parameterized constructors with same signatureDefine 2 default constructorsDefine default constructor, 1 parameter constructor and 2 parameter constructor

10. Which among the following is false for a constructor?

Constructors may or may not have any arguments being acceptedConstructors are always user definedConstructors doesn’t have a return valueConstructors are overloaded with different signature

11. The destructor can be called before the constructor if required.

TrueMaybeFalseCan't Say

12. If constructors of a class are defined in private access, then __________

Instance can be created anywhere in the programInstance can be created only in another classThe class can be inheritedThe class can’t be inherited

13. Which among the following best describes constructor overloading?

Defining destructor with each constructorDefining more than one constructor in single classDefining more than one constructor in single class with different signatureDefining one constructor in each class of a program

14. What are we only create an object but don’t call any constructor for it in java?

Object is initialized to some null valuesImplicit constructor will be calledObject is not createdObject is created but points to null

15. Which among the following describes a destructor?

A special function that is called to free the resources, acquired by the objectA special function that is called anytime to delete an objectA special function that is called to delete the classA special function that is called to delete all the objects of a class

16. Which among the following best describes destructor?

A function which is called after termination of the programA function which is called after each reference to the objectA function which is called just before the objects are destroyedA function which is called before calling any member function

17. How many types of constructors are available, in general, in any language?

2543

18. If class C inherits class B. And B has inherited class A. Then while creating the object of class C, what will be the sequence of constructors getting called?

Constructor of A then B, finally CConstructor of A then C, finally of BConstructor of C then B, finally of AConstructor of C then A, finally B

19. Copy constructor will be called whenever the compiler __________

Generates member function callsGenerates object operationsGenerates implicit codeGenerates temporary object

20. Which among the following is true?

Default constructor is and always called implicitly onlyDefault parameters constructor isn’t equivalent to the default constructorDefault constructor can’t be defined by the programmerDefault constructor can be called explicitly

21. Within a class, only one static constructor can be created.

TrueFalseMaybeCan't Say

22. Which among the following is not a necessary condition for constructors?

Its name must be same as that of classIt must contain a definition bodyIt can contains argumentsIt must not have any return type

23. If a programmer defines a class and defines a default value parameterized constructor inside it.
He has not defined any default constructor. And then he try to create the object without passing arguments, which among the following will be correct?

It will create the object (as at least some constructor is defined)It will create the object (as the default arguments are passed)It will not create the object (as parameterized constructor is used)It will not create the object (as the default constructor is not defined)

24. Which among the following is true for static constructor?

Static constructors can be used to initialize the non-static members alsoStatic constructors are used initialize data members to zero alwaysStatic constructors can’t be parameterized constructorsStatic constructors are called with every new object

25. How many types of constructors are available for use in general (with respect to parameters)?

3524

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