C# Collection Classes Questions with Answers | Programming Practice | Page 3

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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Q21

Which collection does not allow duplicate keys

A List
B ArrayList
C Explanation: Dictionary requires unique keys.
D Queue

Answer: Option C

Explanation: Dictionary requires unique keys.

Q22

Which collection is non-generic and stores data as object

A List<T>
B Dictionary<T,K>
C Explanation: ArrayList stores all elements as object type.
D LinkedList<T>

Answer: Option C

Explanation: ArrayList stores all elements as object type.

Q23

Which collection provides fast lookup using keys

A Stack
B Queue
C Explanation: Dictionary provides fast key-based access.
D List

Answer: Option C

Explanation: Dictionary provides fast key-based access.

Q24

Which class represents a collection of objects sorted by key

A Hashtable
B Explanation: SortedList stores key-value pairs in sorted order.
C Stack
D Queue

Answer: Option B

Explanation: SortedList stores key-value pairs in sorted order.

Q25

Which collection allows duplicate values but unique keys

A List
B Explanation: Dictionary allows duplicate values but keys must be unique.
C Queue
D Stack

Answer: Option B

Explanation: Dictionary allows duplicate values but keys must be unique.

Q26

Which method is used to add an element to List<T>

A Insert()
B Explanation: Add() is used to insert elements into List<T>.
C Push()
D Enqueue()

Answer: Option B

Explanation: Add() is used to insert elements into List<T>.

Q27

Which method removes the top element of a Stack

A Remove()
B Delete()
C Explanation: Pop() removes and returns the top element.
D Clear()

Answer: Option C

Explanation: Pop() removes and returns the top element.

Q28

Which method adds an element to a Queue

A Push()
B Add()
C Explanation: Enqueue() adds an element to a Queue.
D Insert()

Answer: Option C

Explanation: Enqueue() adds an element to a Queue.

Q29

Which collection allows indexed access

A Queue
B Stack
C Explanation: List allows access using index positions.
D Dictionary

Answer: Option C

Explanation: List allows access using index positions.

Q30

Which collection stores elements as nodes with links

A ArrayList
B List
C Explanation: LinkedList stores elements as linked nodes.
D Dictionary

Answer: Option C

Explanation: LinkedList stores elements as linked nodes.

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