C# Interface Test - Sanfoundry

1. Which keyword is used for correct implementation of an interface in C#.NET?

interface

Interface

Intf

intf

2. Choose the statements which makes interface different from classes?

Interfaces cannot be used directly like classes to create new objects

Interfaces consists of declaration of methods, properties events and type definitions

All of the mentioned

Unlike classes, interfaces consists of only declaration but not implementation

3. Which statement correctly defines Interfaces in C#.NET?

Interfaces consists of only method declaration

Interfaces consists of data static in nature and static methods

None of the mentioned

Interfaces cannot be inherited

4. Select the correct implementation of the interface which is mentioned below.

interface a1
{
    int fun(int i);
}

 class a
 {
     int fun(int i) as a1.fun
     {
     }
 }

 class a: a1
 {
     int a1.fun(int i)
     {
     }
 }

class a: implements a1
{
    int fun(int i)
    {
    }
}

None of the mentioned

5. Which of the following is the correct way of implementing an interface addition by class maths?

class maths implements addition {}

class maths : addition {}

class maths imports addition {}

none of the mentioned

6. Which of these can be used to fully abstract a class from its implementation?

Packages

None of the Mentioned

Objects

Interfaces

7. Which of the following cannot be used to declare an interface correctly?

Properties

Structures

Methods

Events

8. Does C#.NET support partial implementation of interfaces?

False

Can't Say

None of the mentioned

True

9. Access specifiers which can be used for an interface are?

All of the mentioned

Protected

Public

Private

10. A class consists of two interfaces with each interface consisting of three methods. The class had no instance data. Which of the following indicates the correct size of object created from this class?

24 bytes

16 bytes

0 bytes

12 bytes

11. Select the correct statement among the given statements?

None of the mentioned

Interfaces cannot be inherited

One class could implement only one interface

Properties could be declared inside an interface

12. Which of the following statements correctly define about the implementation of interface?

One interface can be implemented in another interface

The calls to implementation of interface methods are routed through a method table

None of the mentioned

A class which implements an interface can explicitly implement members of that interface