What does LINQ stand for?
a. Language Integrated Query
b. Language Interchange Query
c. Language Intelligent Query
d. Language Indexed Query
Answer: a. Language Integrated Query
Which LINQ method is used to filter data?
a. Where()
b. Select()
c. OrderBy()
d. GroupBy()
Answer: a. Where()
What is the purpose of the Select() method in LINQ?
a. To project each element of a sequence into a new form
b. To filter elements based on a condition
c. To sort elements in ascending order
d. To group elements based on a key
Answer: a. To project each element of a sequence into a new form
Which LINQ method is used to sort data in ascending order?
a. OrderBy()
b. SortBy()
c. Arrange()
d. Order()
Answer: a. OrderBy()
What is the function of GroupBy() in LINQ?
a. To group elements that share a common attribute
b. To sort elements based on a key
c. To filter elements based on a condition
d. To project each element into a new form
Answer: a. To group elements that share a common attribute
Which method is used to combine multiple sequences into a single sequence in LINQ?
a. Concat()
b. Join()
c. Merge()
d. Combine()
Answer: a. Concat()
What does the Any() method in LINQ determine?
a. Whether any elements in a sequence satisfy a condition
b. The count of elements in a sequence
c. The first element in a sequence
d. Whether all elements in a sequence satisfy a condition
Answer: a. Whether any elements in a sequence satisfy a condition
Which LINQ method returns a single, specific element from a sequence?
a. Single()
b. First()
c. Last()
d. ElementAt()
Answer: a. Single()
What does the Count() method in LINQ return?
a. The number of elements in a sequence
b. The first element of a sequence
c. The last element of a sequence
d. The sum of elements in a sequence
Answer: a. The number of elements in a sequence
How can you retrieve the first element of a sequence in LINQ?
a. First()
b. Top()
c. Initial()
d. Start()
Answer: a. First()
What is the purpose of Distinct() method in LINQ?
a. To remove duplicate elements from a sequence
b. To sort elements in descending order
c. To group elements based on a key
d. To combine multiple sequences into one
Answer: a. To remove duplicate elements from a sequence
Which LINQ method is used to project each element into a new form while maintaining the original sequence?
a. Select()
b. Project()
c. Transform()
d. Map()
Answer: a. Select()
How do you perform a join operation between two sequences in LINQ?
a. Join()
b. Combine()
c. Merge()
d. Connect()
Answer: a. Join()
What is the result of Skip(n) in LINQ?
a. Skips the first n elements of a sequence
b. Takes the first n elements of a sequence
c. Skips the last n elements of a sequence
d. Takes the last n elements of a sequence
Answer: a. Skips the first n elements of a sequence
What does Take(n) do in LINQ?
a. Takes the first n elements of a sequence
b. Skips the first n elements of a sequence
c. Takes the last n elements of a sequence
d. Skips the last n elements of a sequence
Answer: a. Takes the first n elements of a sequence
Which method is used to execute a LINQ query and convert the result to a list?
a. ToList()
b. ConvertToList()
c. AsList()
d. GetList()
Answer: a. ToList()
What is the purpose of Aggregate() method in LINQ?
a. To apply an accumulator function over a sequence
b. To group elements based on a key
c. To sort elements in a sequence
d. To filter elements based on a condition
Answer: a. To apply an accumulator function over a sequence
Which LINQ method is used to return a default value if no elements are found?
a. DefaultIfEmpty()
b. Fallback()
c. ReturnDefault()
d. EmptyDefault()
Answer: a. DefaultIfEmpty()
What does All() method in LINQ check?
a. Whether all elements in a sequence satisfy a condition
b. Whether any element in a sequence satisfies a condition
c. The total number of elements in a sequence
d. The first element in a sequence
Answer: a. Whether all elements in a sequence satisfy a condition
How do you perform a projection that returns an anonymous type in LINQ?
a. By using Select()
b. By using Project()
c. By using Transform()
d. By using Map()
Answer: a. By using Select()
Which LINQ method is used to combine elements from two sequences based on a matching key?
a. Join()
b. Combine()
c. Merge()
d. Intersect()
Answer: a. Join()
What does Reverse() do in LINQ?
a. Reverses the order of elements in a sequence
b. Removes duplicate elements from a sequence
c. Groups elements based on a key
d. Projects each element into a new form
Answer: a. Reverses the order of elements in a sequence
Which method in LINQ can be used to sort elements in descending order?
a. OrderByDescending()
b. SortDescending()
c. ArrangeDescending()
d. OrderDescending()
Answer: a. OrderByDescending()
What is the purpose of Zip() method in LINQ?
a. To combine two sequences into one by matching elements at the same index
b. To filter elements based on a condition
c. To sort elements in ascending order
d. To project each element into a new form
Answer: a. To combine two sequences into one by matching elements at the same index
What does TakeWhile() do in LINQ?
a. Takes elements from a sequence while a specified condition is true
b. Skips elements from a sequence while a specified condition is true
c. Takes elements from a sequence until a specified condition is true
d. Skips elements from a sequence until a specified condition is true
Answer: a. Takes elements from a sequence while a specified condition is true
What is the result of FirstOrDefault() in LINQ?
a. Returns the first element of a sequence or a default value if the sequence is empty
b. Returns the last element of a sequence or a default value if the sequence is empty
c. Returns the first element of a sequence or null if the sequence is empty
d. Returns a default value if the sequence is empty
Answer: a. Returns the first element of a sequence or a default value if the sequence is empty
How do you perform a cross join of two sequences in LINQ?
a. By using SelectMany()
b. By using Join()
c. By using Concat()
d. By using CrossJoin()
Answer: a. By using SelectMany()
Which LINQ method is used to return elements that appear in both sequences?
a. Intersect()
b. Join()
c. Union()
d. Except()
Answer: a. Intersect()
What is the purpose of Except() method in LINQ?
a. To return elements that are in the first sequence but not in the second sequence
b. To combine elements from two sequences
c. To return elements that appear in both sequences
d. To sort elements in ascending order
Answer: a. To return elements that are in the first sequence but not in the second sequence
How do you perform a projection with multiple fields in LINQ?
a. By using Select() with an anonymous type
b. By using Project() with multiple fields
c. By using Transform() with multiple fields
d. By using Map() with multiple fields
Answer: a. By using Select() with an anonymous type
Which LINQ method can be used to perform a query on a specific field in a collection?
a. Select()
b. Filter()
c. Query()
d. Project()
Answer: a. Select()
What does ToArray() do in LINQ?
a. Converts the result of a query into an array
b. Converts the result of a query into a list
c. Converts the result of a query into a dictionary
d. Converts the result of a query into a collection
Answer: a. Converts the result of a query into an array
Which method in LINQ is used to apply a function to each element of a sequence?
a. ForEach()
b. Select()
c. Apply()
d. Process()
Answer: b. Select()
What is the result of LastOrDefault() in LINQ?
a. Returns the last element of a sequence or a default value if the sequence is empty
b. Returns the first element of a sequence or a default value if the sequence is empty
c. Returns the last element of a sequence or null if the sequence is empty
d. Returns a default value if the sequence is empty
Answer: a. Returns the last element of a sequence or a default value if the sequence is empty
How do you ensure that the results of a LINQ query are distinct?
a. By using Distinct()
b. By using Unique()
c. By using Separate()
d. By using RemoveDuplicates()
Answer: a. By using Distinct()
What does TakeLast(n) do in LINQ?
a. Takes the last n elements of a sequence
b. Skips the last n elements of a sequence
c. Takes the first n elements of a sequence
d. Skips the first n elements of a sequence
Answer: a. Takes the last n elements of a sequence
Which LINQ method is used to return a subset of elements from a sequence based on a condition?
a. Where()
b. Filter()
c. Subset()
d. Select()
Answer: a. Where()
How can you use LINQ to perform a left outer join?
a. By using GroupJoin()
b. By using LeftJoin()
c. By using Join()
d. By using OuterJoin()
Answer: a. By using GroupJoin()
What is OrderByDescending() used for in LINQ?
a. To sort elements in descending order
b. To group elements in descending order
c. To filter elements in descending order
d. To project elements in descending order
Answer: a. To sort elements in descending order
Which method in LINQ can be used to perform a union of two sequences, removing duplicates?
a. Union()
b. Combine()
c. Merge()
d. Concat()
Answer: a. Union()
What is the purpose of SelectMany() method in LINQ?
a. To flatten a sequence of sequences into a single sequence
b. To group elements into multiple sequences
c. To join two sequences into a single sequence
d. To combine elements from multiple sequences
Answer: a. To flatten a sequence of sequences into a single sequence
What does the ToDictionary() method do in LINQ?
a. Converts a sequence into a dictionary
b. Converts a sequence into a list
c. Converts a sequence into an array
d. Converts a sequence into a set
Answer: a. Converts a sequence into a dictionary
Which method can be used to project a sequence into a dictionary with a key selector?
a. ToDictionary()
b. ToKeyDictionary()
c. ToIndexedDictionary()
d. ProjectToDictionary()
Answer: a. ToDictionary()
What does ElementAt() method in LINQ do?
a. Returns the element at a specified index in a sequence
b. Returns the first element in a sequence
c. Returns the last element in a sequence
d. Returns a default value if the index is out of range
Answer: a. Returns the element at a specified index in a sequence
Which LINQ method is used to group elements by a key and then project the results?
a. GroupBy()
b. Group()
c. Aggregate()
d. OrderBy()
Answer: a. GroupBy()
How do you use LINQ to filter elements based on multiple conditions?
a. By chaining multiple Where() methods
b. By using Filter() method with multiple conditions
c. By using Select() with multiple conditions
d. By using AndWhere()
Answer: a. By chaining multiple Where() methods
What is the purpose of TakeWhile() in LINQ?
a. To take elements from a sequence while a condition is true
b. To skip elements from a sequence while a condition is true
c. To take elements from a sequence until a condition is true
d. To skip elements from a sequence until a condition is true
Answer: a. To take elements from a sequence while a condition is true
Which method is used to execute a LINQ query against a database context in Entity Framework?
a. ToList()
b. ToArray()
c. AsEnumerable()
d. AsQueryable()
Answer: d. AsQueryable()
What does the AsQueryable() method do in LINQ?
a. Converts a collection to an IQueryable<T>
b. Converts a collection to an IEnumerable<T>
c. Executes a LINQ query immediately
d. Converts a collection to a list
Answer: a. Converts a collection to an IQueryable<T>