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In which of the following areas are delegates commonly used? Remoting

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  • Question
  • In which of the following areas are delegates commonly used?

    1. Remoting
    2. Serialization
    3. File Input/Output
    4. Multithreading
    5. Event handling


  • Options
  • A. 1 and 2 only
  • B. 1 and 5 only
  • C. 1, 2 and 3 only
  • D. 4 and 5 only
  • E. All of the above

  • Correct Answer
  • 4 and 5 only 


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    Delegates problems


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    • 1. Which of the following statements are correct about the delegate declaration given below?

          delegate void del(int i);
      1. On declaring the delegate a class called del will get created.
      2. The signature of del need not be same as the signature of the method that we intend to call using it.
      3. The del class will be derived from the MulticastDelegate class.
      4. The method that can be called using del should not be a static method.
      5. The del class will contain a one-argument constructor and an lnvoke() method.

    • Options
    • A. 1, 2 and 3 only
    • B. 1, 3 and 5 only
    • C. 2 and 4 only
    • D. 4 only
    • E. All of the above
    • Discuss
    • 2. Which of the following statements are correct about an interface in C#.NET?

      1. A class can implement multiple interfaces.
      2. Structures cannot inherit a class but can implement an interface.
      3. In C#.NET, : is used to signify that a class member implements a specific interface.
      4. An interface can implement multiple classes.
      5. The static attribute can be used with a method that implements an interface declaration.

    • Options
    • A. 1, 2, 3
    • B. 2, 4
    • C. 3, 5
    • D. None of the above.
    • Discuss
    • 3. Which of the following statements is correct about an interface used in C#.NET?

    • Options
    • A. One class can implement only one interface.
    • B. In a program if one class implements an interface then no other class in the same program can implement this interface.
    • C. From two base interfaces a new interface cannot be inherited.
    • D. Properties can be declared inside an interface.
    • E. Interfaces cannot be inherited.
    • Discuss
    • 4. 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
    • 5. 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
    • 6. Which of the following statements is incorrect about delegate?

    • Options
    • A. Delegates are reference types.
    • B. Delegates are object oriented.
    • C. Delegates are type-safe.
    • D. Delegates serve the same purpose as function pointers in C and pointers to member function operators in C++.
    • E. Only one method can be called using a delegate.
    • Discuss
    • 7. Which of the following is the necessary condition for implementing delegates?

    • Options
    • A. Class declaration
    • B. Inheritance
    • C. Run-time Polymorphism
    • D. Exceptions
    • E. Compile-time Polymorphism
    • Discuss
    • 8. Which of the following is the correct way to call subroutine MyFun() of the Sample class given below?

      class Sample
      {
          public void MyFun(int i, Single j)
          {
              Console.WriteLine("Welcome to CuriousTab !");
          }
      }

    • Options
    • A.
      delegate void del(int i);
      Sample s = new Sample();
      del d = new del(ref s.MyFun);
      d(10, 1.1f);
    • B.
      delegate void del(int i, Single j);
      del d;
      Sample s = new Sample();
      d = new del(ref s.MyFun);
      d(10, 1.1f);
    • C.
      Sample s = new Sample();
      delegate void d = new del(ref MyFun);
      d(10, 1.1f);
    • D.
      delegate void del(int i, Single]);
      Sample s = new Sample();
      del = new delegate(ref MyFun);
      del(10, 1.1f);
    • Discuss
    • 9. Which of the following statements are correct about a delegate?

      1. Inheritance is a prerequisite for using delegates.
      2. Delegates are type-safe.
      3. Delegates provide wrappers for function pointers.
      4. The declaration of a delegate must match the signature of the method that we intend to call using it.
      5. Functions called using delegates are always late-bound.

    • Options
    • A. 1 and 2 only
    • B. 1, 2 and 3 only
    • C. 2, 3 and 4 only
    • D. All of the above
    • E. None of the above
    • Discuss
    • 10. With which of the following can the ref keyword be used?

      1. Static data
      2. Instance data
      3. Static function/subroutine
      4. Instance function/subroutine

    • Options
    • A. 1, 2
    • B. 3, 4
    • C. 1, 3
    • D. 2, 4
    • E. All of the above
    • Discuss


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