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  • Question

  • Which of the following can be declared in an interface?

    1. Properties
    2. Methods
    3. Enumerations
    4. Events
    5. Structures


  • Options
  • A. 1, 3
  • B. 1, 2, 4
  • C. 3, 5
  • D. 4, 5

  • Correct Answer
  • 1, 2, 4 

    • Interfaces problems

    Search Results

    • 1. Which of the following statements are correct about an interface used in C#.NET?

      1. An interface can contain properties, methods and events.
      2. The keyword must implement forces implementation of an interface.
      3. Interfaces can be overloaded.
      4. Interfaces can be implemented by a class or a struct.
      5. Enhanced implementations of an interface can be developed without breaking existing code.

    • Options
    • A. 1, 2
    • B. 1, 4, 5
    • C. 3, 4
    • D. 3 only
      • Discuss
    • 2. Which of the following statements is correct about the C#.NET code snippet given below? 

      interface IMyInterface
{ 
    void fun1(); 
    int fun2();
}
class MyClass: IMyInterface
{ 
    void fun1()
    { } 
    int IMyInterface.fun2()
    { } 
}

    • Options
    • A. A function cannot be declared inside an interface.
    • B. A subroutine cannot be declared inside an interface.
    • C. A Method Table will not be created for class MyClass.
    • D. MyClass is an abstract class.
    • E. The definition of fun1() in class MyClass should be void IMyInterface.fun1().
      • Discuss
    • 3. Which of the following statements is correct about an interface?

    • Options
    • A. One interface can be implemented in another interface.
    • B. An interface can be implemented by multiple classes in the same program.
    • C. A class that implements an interface can explicitly implement members of that interface.
    • D. The functions declared in an interface have a body.
      • Discuss
    • 4. Which of the following can implement an interface?

      1. Data
      2. Class
      3. Enum
      4. Structure
      5. Namespace

    • Options
    • A. 1, 3
    • B. 2, 4
    • C. 3, 5
    • D. 4 only
      • Discuss
    • 5. Which of the following statements is correct?

    • Options
    • A. When a class inherits an interface it inherits member definitions as well as its implementations.
    • B. An interface cannot contain the signature of an indexer.
    • C. Interfaces members are automatically public.
    • D. To implement an interface member, the corresponding member in the class must be public as well as static.
      • Discuss
    • 6. Which of the following statements is correct about the C#.NET code snippet given below? 

      interface IPerson
{ 
    String FirstName
    { 
        get; 
        set;
    }
    String LastName
    {
        get; 
        set;
    }
    void Print(); 
    void Stock(); 
    int Fun(); 
}

    • Options
    • A. Properties cannot be declared inside an interface.
    • B. This is a perfectly workable interface.
    • C. The properties in the interface must have a body.
    • D. Subroutine in the interface must have a body.
    • E. Functions cannot be declared inside an interface.
      • Discuss
    • 7. Which of the following statements is correct about the C#.NET code snippet given below? 

      interface IMyInterface 
{
    void fun1(); 
    void fun2();
}
class MyClass: IMyInterface
{ 
    private int i; 
    void IMyInterface.fun1()
    { 
        // Some code
    } 
}

    • Options
    • A. Class MyClass is an abstract class.
    • B. Class MyClass cannot contain instance data.
    • C. Class MyClass fully implements the interface IMyInterface.
    • D. Interface IMyInterface should be inherited from the Object class.
    • E. The compiler will report an error since the interface IMyInterface is only partially implemented.
      • Discuss
    • 8. Which of the following is the correct implementation of the interface given below? 

      interface IMyInterface
{ 
    double MyFun(Single i);
}

    • Options
    • A. 
      class MyClass
{
    double MyFun(Single i) as IMyInterface.MyFun
    {
        // Some code
    }
}
    • B. 
      class MyClass 
{
    MyFun (Single i) As Double
    {
        // Some code
    } 
}
    • C. 
      class MyClass: implements IMyInterface
{
    double fun(Single si) implements IMyInterface.MyFun()
    {
        //Some code
    } 
}
    • D. 
      class MyClass: IMyInterface
{
    double IMyInterface.MyFun(Single i)
    {
        // Some code
    } 
}
      • Discuss
    • 9. Which of the following statements is correct about an interface used in C#.NET?

    • Options
    • A. If a class implements an interface partially, then it should be an abstract class.
    • B. A class cannot implement an interface partially.
    • C. An interface can contain static methods.
    • D. An interface can contain static data.
    • E. Multiple interface inheritance is not allowed.
      • Discuss
    • 10. Which of the following is the correct way to implement the interface given below? 

      interface IPerson
{ 
    String FirstName
    {
        get;
        set; 
    } 
}

    • Options
    • A. 
      class Employee : IPerson
{
    private String str; 
    public String FirstName
    {
        get
        { 
            return str;
        } 
        set
        { 
            str = value;
        } 
    } 
}
    • B. 
      class Employee
{
    private String str;
    public String IPerson.FirstName
    { 
        get
        { 
            return str;
        } 
        set
        { 
            str = value;
        } 
    } 
}
    • C. 
      class Employee : implements IPerson
{
    private String str; 
    public String FirstName
    { 
        get
        { 
            return str;
        } 
        set
        {
            str = value; 
        } 
    } 
}
    • D. None of the above
      • Discuss

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