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  • Question
  • Which of the following can be declared as a virtual in a class?

    1. Methods
    2. Properties
    3. Events
    4. Fields
    5. Static fields


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

  • Correct Answer
  • 1, 2, 3 


  • Polymorphism problems


    Search Results


    • 1. Which of the following are necessary for Run-time Polymorphism?

      1. The overridden base method must be virtual, abstract or override.
      2. Both the override method and the virtual method must have the same access level modifier.
      3. An override declaration can change the accessibility of the virtual method.
      4. An abstract inherited property cannot be overridden in a derived class.
      5. An abstract method is implicitly a virtual method.

    • Options
    • A. 1, 3
    • B. 1, 2, 5
    • C. 2, 3, 4
    • D. 4 only
    • Discuss
    • 2. Which of the following keyword is used to overload user-defined types by defining static member functions?

    • Options
    • A. op
    • B. opoverload
    • C. operator
    • D. operatoroverload
    • E. udoperator
    • Discuss
    • 3. Which of the followings is the correct way to overload + operator?

    • Options
    • A.
      public sample operator + ( sample a, sample b )
    • B.
      public abstract operator + ( sample a, sample b)
    • C.
      public abstract sample operator + (sample a, sample b )
    • D.
      public static sample operator + ( sample a, sample b )
    • E. All of the above
    • Discuss
    • 4. Which of the following statements is correct?

    • Options
    • A. The conditional logical operators cannot be overloaded.
    • B. When a binary operator is overloaded the corresponding assignment operator, if any, must be explicitly overloaded.
    • C. We can use the default equality operator in an overloaded implementation of the equality operator.
    • D. A public or nested public reference type does not overload the equality operator.
    • E. The array indexing operator can be overloaded.
    • Discuss
    • 5. Which of the following statements is correct?

    • Options
    • A. Only one object can be created from an abstract class.
    • B. By default methods are virtual.
    • C. If a derived class does not provide its own version of virtual method then the one in the base class is used.
    • D. If the method in the derived class is not preceded by override keywords, the compiler will issue a warning and the method will behave as if the override keyword were present.
    • E. Each derived class does not have its own version of a virtual method.
    • Discuss
    • 6. Which of the following statements are correct about a HashTable collection?

      1. It is a keyed collection.
      2. It is a ordered collection.
      3. It is an indexed collection.
      4. It implements a IDictionaryEnumerator interface in its inner class.
      5. The key - value pairs present in a HashTable can be accessed using the Keys and Values properties of the inner class that implements the IDictionaryEnumerator interface.

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

      Stack st = new Stack();
      st.Push("hello");
      st.Push(8.2);
      st.Push(5);
      st.Push('b');
      st.Push(true);

    • Options
    • A. Dissimilar elements like "hello", 8.2, 5 cannot be stored in the same Stack collection.
    • B. Boolean values can never be stored in Stack collection.
    • C. In the fourth call to Push(), we should write "b" in place of 'b'.
    • D. To store dissimilar elements in a Stack collection, a method PushAnyType() should be used in place of Push().
    • E. This is a perfectly workable code.
    • Discuss
    • 8. Which of the following is the correct way to find out the number of elements currently present in an ArrayList Collection called arr?

    • Options
    • A. arr.Count
    • B. arr.GrowSize
    • C. arr.MaxIndex
    • D. arr.Capacity
    • E. arr.UpperBound
    • Discuss
    • 9. In which of the following collections is the Input/Output based on a key?

      1. Map
      2. Stack
      3. BitArray
      4. HashTable
      5. SortedList

    • Options
    • A. 1 and 2 only
    • B. 2 and 3 only
    • C. 1, 2 and 3 only
    • D. 4 and 5 only
    • E. All of the above
    • Discuss
    • 10. Which of the following statements are correct about the Stack collection?

      1. It can be used for evaluation of expressions.
      2. All elements in the Stack collection can be accessed using an enumerator.
      3. It is used to maintain a FIFO list.
      4. All elements stored in a Stack collection must be of similar type.
      5. Top-most element of the Stack collection can be accessed using the Peek() method.

    • Options
    • A. 1 and 2 only
    • B. 3 and 4 only
    • C. 1, 2 and 5 only
    • D. All of the above
    • E. None of the above
    • Discuss


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