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Welcome to the Constructors and Destructors MCQs Page

Dive deep into the fascinating world of Constructors and Destructors with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Constructors and Destructors, a crucial aspect of Object Oriented Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of Constructors and Destructors, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Object Oriented Programming.

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Check out the MCQs below to embark on an enriching journey through Constructors and Destructors. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Object Oriented Programming.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Constructors and Destructors. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Constructors and Destructors MCQs | Page 6 of 9

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Q51.
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

Discuss
Answer: (d).As soon as object is created
Q52.
Which among the following function can be used to call default constructor implicitly in java?

a.

this()

b.

that()

c.

super()

d.

sub()

Discuss
Answer: (a).this()
Q53.
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

Discuss
Answer: (c).To initialize the object in different ways
Q54.
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

Discuss
Answer: (a).Default constructor will not be created by the compiler implicitly
Q55.
Which among the following is not valid in java?

a.

Constructor overloading

b.

Recursive constructor call

c.

Default value constructors

d.

String argument constructor

Discuss
Answer: (b).Recursive constructor call
Q56.
Which constructor will be called from the object obj2 in the following program? 
class A
{
 int i;
 A()
 {  
  i=0;  
 }
 A(int x)
 {  
  i=x+1;  
 }
 A(int y, int x)
 {  
  i=x+y;  
 }
};
A obj1(10);
A obj2(10,20);
A obj3;

a.

A(int x)

b.

A(int y)

c.

A(int y, int x)

d.

A(int y; int x)

Discuss
Answer: (c).A(int y, int x)
Q57.
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

Discuss
Answer: (d).Object is created but points to null
Q58.
Which is correct syntax?

a.

classname objectname= new() integer;

b.

classname objectname= new classname;

c.

classname objectname= new classname();

d.

classname objectname= new() classname();

Discuss
Answer: (c).classname objectname= new classname();
Q59.
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

Discuss
Answer: (b).A function which is called whenever an object is created to initialize the members
Q60.
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

Discuss
Answer: (a).A function which is called just before the objects are destroyed
Page 6 of 9

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