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  • Question
  • In which of the following collections is the Input/Output index-based?

    1. Stack
    2. Queue
    3. BitArray
    4. ArrayList
    5. HashTable


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

  • Correct Answer
  • 3 and 4 only 


  • Collection Classes problems


    Search Results


    • 1. Which of the following is NOT an interface declared in System.Collections namespace?

    • Options
    • A. IComparer
    • B. IEnumerable
    • C. IEnumerator
    • D. IDictionaryComparer
    • E. IDictionaryEnumerator
    • Discuss
    • 2. Suppose value of the Capacity property of ArrayList Collection is set to 4. What will be the capacity of the Collection on adding fifth element to it?

    • Options
    • A. 4
    • B. 8
    • C. 16
    • D. 32
    • Discuss
    • 3. Which of the following statements are correct about the Collection Classes available in Framework Class Library?

    • Options
    • A. Elements of a collection cannot be transmitted over a network.
    • B. Elements stored in a collection can be retrieved but cannot be modified.
    • C. It is not easy to adopt the existing Collection classes for newtype of objects.
    • D. Elements stored in a collection can be modified only if allelements are of similar types.
    • E. They use efficient algorithms to manage the collection, thereby improving the performance of the program.
    • Discuss
    • 4. Which of the following statements are correct about an ArrayList collection that implements the IEnumerable interface?

      1. The ArrayList class contains an inner class that implements the IEnumerator interface.
      2. An ArrayList Collection cannot be accessed simultaneously by different threads.
      3. The inner class of ArrayList can access ArrayList class's members.
      4. To access members of ArrayList from the inner class, it is necessary to pass ArrayList class's reference to it.
      5. Enumerator's of ArrayList Collection can manipulate the array.

    • Options
    • A. 1 and 2 only
    • B. 1 and 3 and 4 only
    • C. 2 and 5 only
    • D. All of the above
    • E. None of the above
    • Discuss
    • 5. 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
    • 6. Which of the following is an ordered collection class?

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

    • Options
    • A. 1 only
    • B. 2 and 3 only
    • C. 4 and 5 only
    • D. All of the above
    • E. None of the above
    • Discuss
    • 7. A HashTable t maintains a collection of names of states and capital city of each state. Which of the following is the correct way to find out whether "Kerala" state is present in this collection or not?

    • Options
    • A. t.ContainsKey("Kerala");
    • B. t.HasValue("Kerala");
    • C. t.HasKey("Kerala");
    • D. t.ContainsState("Kerala");
    • E. t.ContainsValue("Kerala");
    • Discuss
    • 8. Which of the following is the correct way to access all elements of the Queue collection created using the C#.NET code snippet given below?

      Queue q = new Queue(); 
      q.Enqueue("Sachin"); 
      q.Enqueue('A'); 
      q.Enqueue(false); 
      q.Enqueue(38); 
      q.Enqueue(5.4);

    • Options
    • A.
      IEnumerator e;
      e = q.GetEnumerator(); 
      while (e.MoveNext())
      Console.WriteLine(e.Current);
    • B.
      IEnumerable e;
      e = q.GetEnumerator(); 
      while (e.MoveNext()) 
      Console.WriteLine(e.Current);
    • C.
      IEnumerator e;
      e = q.GetEnumerable(); 
      while (e.MoveNext()) 
      Console.WriteLine(e.Current);
    • D.
      IEnumerator e;
      e = Queue.GetEnumerator(); 
      while (e.MoveNext()) 
      Console.WriteLine(e.Current);
    • Discuss
    • 9. Which of the following is the correct way to access all elements of the Stack collection created using the C#.NET code snippet given below?

      Stack st = new Stack();
      st.Push(11);
      st.Push(22);
      st.Push(-53);
      st.Push(33);
      st.Push(66);

    • Options
    • A.
      IEnumerable e;
      e = st.GetEnumerator(); 
      while (e.MoveNext())
      Console.WriteLine(e.Current);
    • B.
      IEnumerator e;
      e = st.GetEnumerable(); 
      while (e.MoveNext())
      Console.WriteLine(e.Current);
    • C.
      IEnumerator e;
      e = st.GetEnumerator(); 
      while (e.MoveNext()) 
      Console.WriteLine(e.Current);
    • D.
      IEnumerator e;
      e = Stack.GetEnumerator(); 
      while (e.MoveNext()) 
      Console.WriteLine(e.Current);
    • Discuss
    • 10. In a HashTable Key cannot be null, but Value can be.

    • Options
    • A. True
    • B. False
    • Discuss


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