Which of the following statements about List<T> in C# is true?

List<T> allows null values for reference types

List<T> cannot contain duplicate elements

List<T> is always sorted by default

List<T> has a fixed capacity and cannot grow

What is the main difference between List<T> and ArrayList in C#?

List<T> is generic while ArrayList is non-generic

ArrayList allows duplicates while List<T> does not

List<T> is always sorted while ArrayList is not

ArrayList has fixed size while List<T> is dynamic

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C#: Collections - Lists and Dictionaries Quiz

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Question 1

Which of the following statements about List<T> in C# is true?

List<T> cannot contain duplicate elements
List<T> is always sorted by default
List<T> allows null values for reference types
List<T> has a fixed capacity and cannot grow

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Question 2

What is the default initial capacity of an ArrayList in C#?

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Question 3

What is the main difference between List<T> and ArrayList in C#?

ArrayList allows duplicates while List<T> does not
List<T> is generic while ArrayList is non-generic
List<T> is always sorted while ArrayList is not
ArrayList has fixed size while List<T> is dynamic

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Question 4

Which methods are used to check the existence of keys and values in a C# Dictionary?

ContainsKey() and ContainsValue()
HasKey() and HasValue()
ExistsKey() and ExistsValue()
CheckKey() and CheckValue()

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Question 5

Which method is used to copy all elements of a Collection<T> to an array?

Clone()
Copy()
CopyTo()
Export()

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Question 6

Which property of Collection<T> is used to access an element by index?

Items
ElementAt
Item[Int32]
GetAt(Int32)

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Question 7

Which statement is correct about collection initializers in C#?

They replace the Add() method internally
They cannot contain null values
They only work with arrays
They require at least one constructor argument

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Question 8

Which constructor creates a list with a specified initial capacity?

List<T>()
List<T>(IEnumerable<T>)
List<T>(Int32)
List<T>(Capacity<T>)

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Question 9

What is the main advantage of using an object initializer in C#?

It replaces constructors completely
It initializes object properties directly at creation
It automatically sorts object properties
It prevents null values in objects

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Question 10

Which property of the Collection<T> class is used to retrieve the number of elements contained in the collection?

Items
Count
Length
Capacity

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