C# Collection Classes Questions with Answers | Programming Practice | Page 4

C# Collection Classes questions with answers are highly useful for mastering data storage and manipulation techniques in programming. Topics like Lists, Dictionaries, Queues, and HashSets are frequently tested in programming interviews and coding assessments. Practicing programming questions and answers with explanations helps students improve their understanding of C# data structures and performance optimization. Such programming MCQs and problem-based aptitude questions are commonly asked in technical interviews and placement tests conducted by companies like Microsoft, TCS, and Infosys. Strengthen your skills through C# programming test practice and learn to use collections efficiently.

Questions on data collections in C language. Broaden skills with arrays and pointers

Showing 10 of 39 questions

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Q31

Which collection class is thread-safe by default

A List
B ArrayList
C Explanation: Hashtable is thread-safe by default.
D Dictionary

Answer: Option C

Explanation: Hashtable is thread-safe by default.

Q32

Which property returns the number of elements in a collection

A Length
B Size
C Explanation: Count property gives the total number of elements.
D Total

Answer: Option C

Explanation: Count property gives the total number of elements.

Q33

Which collection is best suited for frequent insertions and deletions

A Array
B List
C Explanation: LinkedList is efficient for frequent insert and delete operations.
D Stack

Answer: Option C

Explanation: LinkedList is efficient for frequent insert and delete operations.

Q34

Which method removes all elements from a collection

A RemoveAll()
B Delete()
C Explanation: Clear() removes all elements from the collection.
D Reset()

Answer: Option C

Explanation: Clear() removes all elements from the collection.

Q35

Which collection stores data in unordered key-value pairs

A SortedList
B Explanation: Dictionary does not maintain sorted order by default.
C Stack
D Queue

Answer: Option B

Explanation: Dictionary does not maintain sorted order by default.

Q36

Which collection can store different data types together

A List<T>
B Dictionary<T,K>
C Explanation: ArrayList can store different data types as objects.
D LinkedList<T>

Answer: Option C

Explanation: ArrayList can store different data types as objects.

Q37

Which method checks whether a key exists in Dictionary

A Exists()
B HasKey()
C Explanation: ContainsKey() checks for the existence of a key.
D FindKey()

Answer: Option C

Explanation: ContainsKey() checks for the existence of a key.

Q38

Which collection is recommended over ArrayList for better performance

A Queue
B Stack
C Explanation: List<T> avoids boxing and unboxing, improving performance.
D Hashtable

Answer: Option C

Explanation: List<T> avoids boxing and unboxing, improving performance.

Q39

Which collection is used to represent a fixed-size collection

A List
B Explanation: Array has a fixed size once created.
C Dictionary
D LinkedList

Answer: Option B

Explanation: Array has a fixed size once created.

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