General Questions

Question 1 :

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.


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
Answer : Option B

Question 2 :

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


A). 1
B). 3
C). 2
D). 4
E). Depends upon the Project Setting made in Visual Studio.NET.
Answer : Option D

Explanation :

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

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


Question 3 :

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

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


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
Answer : Option D

Question 4 :

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


A). True
B). False
Answer : Option A

Question 5 :

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);


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.
Answer : Option E