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  • Question
  • Which of the following statements is incorrect about a delegate?


  • Options
  • A. A single delegate can invoke more than one method.
  • B. Delegates can be shared.
  • C. Delegate is a value type.
  • D. Delegates are type-safe wrappers for function pointers.
  • E. The signature of a delegate must match the signature of the method that is to be called using it.

  • Correct Answer
  • Delegate is a value type. 


  • Delegates problems


    Search Results


    • 1. Suppose a Generic class called SortObjects is to be made capable of sorting objects of any type (Integer, Single, Byte etc.). Which of the following programming constructs should be used to implement the comparision function?

    • Options
    • A. Namespace
    • B. Interface
    • C. Encapsulation
    • D. Delegate
    • E. Attribute
    • Discuss
    • 2. Which of the following statements are correct about delegates?

    • Options
    • A. Delegates cannot be used to call a static method of a class.
    • B. Delegates cannot be used to call procedures that receive variable number of arguments.
    • C. If signatures of two methods are same they can be called through the same delegate object.
    • D. Delegates cannot be used to call an instance function. Delegates cannot be used to call an instance subroutine.
    • Discuss
    • 3. Suppose on pushing a button an object is to be notified, but it is not known until runtime which object should be notified. Which of the following programming constructs should be used to implement this idea?

    • Options
    • A. Attribute
    • B. Delegate
    • C. Namespace
    • D. Interface
    • E. Encapsulation
    • Discuss
    • 4. Which of the following statements are correct about delegates?

      1. Delegates are not type-safe.
      2. Delegate is a user-defined type.
      3. Only one method can be bound with one delegate object.
      4. Delegates can be used to implement callback notification.
      5. Delegates permit execution of a method on a secondary thread in an asynchronous manner.

    • Options
    • A. 1 and 2 only
    • B. 1, 2 and 3 only
    • C. 2, 4 and 5 only
    • D. 4 and 5 only
    • E. All of the above
    • Discuss
    • 5. Which of the following is the correct way to call the function MyFun() of the Sample class given below?

      class Sample
      {
          public int MyFun(int i)
          {
              Console.WriteLine("Welcome to CuriousTab.com !" );
              return 0;
          }
      }

    • Options
    • A.
      delegate void del(int i);
      Sample s = new Sample();
      deld = new del(ref s.MyFun);
      d(10);
    • B.
      delegate int del(int i);
      Sample s = new Sample(.);
      del = new delegate(ref MyFun);
      del(10);
    • C.
      Sample s = new Sample();
      delegate void del = new delegate(ref MyFun);
      del(10);
    • D.
      delegate int del(int i);
      del d;
      Sample s = new Sample();
      d = new del(ref s.MyFun);
      d(10);
    • Discuss
    • 6. Which one of the following classes are present System.Collections.Generic namespace?

      1. Stack
      2. Tree
      3. SortedDictionary
      4. SortedArray

    • Options
    • A. 1 and 2 only
    • B. 2 and 4 only
    • C. 1 and 3 only
    • D. All of the above
    • E. None of the above
    • Discuss
    • 7. For the code snippet shown below, which of the following statements are valid?

      public class TestCuriousTab
      {
          public void TestSub<M> (M arg)
          {
              Console.Write(arg);
          }
      }
      class MyProgram
      {
          static void Main(string[] args)
          {
              TestCuriousTab tab = new TestCuriousTab();
              tab.TestSub("CuriousTab ");
              tab.TestSub(4.2f);
          }
      }

    • Options
    • A. Program will compile and on execution will print: CuriousTab 4.2
    • B. A non generic class Hello cannot have generic subroutine.
    • C. Compiler will generate an error.
    • D. Program will generate a run-time exception.
    • E. None of the above.
    • Discuss
    • 8. For the code snippet shown below, which of the following statements are valid?

      public class Generic<T>
      {
          public T Field; 
          public void TestSub()
          {
              T i = Field + 1;
          }
      }
      class MyProgram
      {
          static void Main(string[] args)
          {
              Generic<int> gen = new Generic<int>();
              gen.TestSub();
          }
      }

    • Options
    • A. Addition will produce result 1.
    • B. Result of addition is system-dependent.
    • C. Program will generate run-time exception.
    • D. Compiler will report an error: Operator '+' is not defined for types T and int.
    • E. None of the above.
    • Discuss
    • 9. Which of the following statements is valid about generic procedures in C#.NET?

    • Options
    • A. All procedures in a Generic class are generic.
    • B. Only those procedures labeled as Generic are generic.
    • C. Generic procedures can take at the most one generic parameter.
    • D. Generic procedures must take at least one type parameter.
    • E. None of the above.
    • Discuss
    • 10. Which of the following statements is valid about advantages of generics?

    • Options
    • A. Generics shift the burden of type safety to the programmer rather than compiler.
    • B. Generics require use of explicit type casting.
    • C. Generics provide type safety without the overhead of multiple implementations.
    • D. Generics eliminate the possibility of run-time errors.
    • E. None of the above.
    • Discuss


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