1.
Which of the following statements are correct about an ArrayList collection that implements the IEnumerable interface?
The ArrayList class contains an inner class that implements the IEnumerator interface.
An ArrayList Collection cannot be accessed simultaneously by different threads.
The inner class of ArrayList can access ArrayList class’s members.
To access members of ArrayList from the inner class, it is necessary to pass ArrayList class’s reference to it.
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 & Explanation
Answer: Option B
Explanation:
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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 & Explanation
Answer: Option D
Explanation:
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3.
In which of the following collections is the Input/Output index-based?
Stack
Queue
BitArray
ArrayList
HashTable
A. 1 and 2 only
B. 3 and 4 only
C. 5 only
D. 1, 2 and 5 only
E. All of the above
Answer & Explanation
Answer: Option B
Explanation:
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4.
In which of the following collections is the Input/Output based on a key?
Map
Stack
BitArray
HashTable
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 & Explanation
Answer: Option D
Explanation:
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5.
In a HashTable Key cannot be null, but Value can be.
A. True B. False
Answer & Explanation
Answer: Option A
Explanation:
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