Collection Classes - General Questions (2)

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?

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.

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);

In a HashTable Key cannot be null, but Value can be.

In which of the following collections is the Input/Output based on a key?

1 Map

2 Stack

3 BitArray

4 HashTable

5 SortedList

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

1 Stack

2 Queue

3 BitArray

4 ArrayList

5 HashTable

How many enumerators will exist if four threads are simultaneously working on an ArrayList object?

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.