LINQ (Language-Integrated Query) in C Sharp MCQ question and answer with solution

31

What is the purpose of the OfType operator in LINQ?

A) Filters the elements of a sequence based on their type B) Returns the number of elements in a sequence C) Converts a sequence to a List D) Converts a sequence to an Array

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Answer & Solution

Answer: Option A

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32

Which LINQ operator is used to return elements from the first sequence that are also present in the second sequence?

A) Union B) Concat C) Except D) Intersect

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Answer: Option D

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33

In LINQ, what does the DistinctBy operator do?

A) Sorts the elements of a sequence in ascending order based on a key B) Filters a sequence based on a predicate C) Returns distinct elements from a sequence based on a specified key selector D) Projects each element of a sequence

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Answer: Option C

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34

What is the purpose of the DefaultIfEmpty operator in LINQ?

A) Returns the number of elements in a sequence B) Returns a default value if a sequence is empty C) Returns a specific element from a sequence D) None of the above

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Answer & Solution

Answer: Option B

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35

Which LINQ operator is used to return elements from a sequence until a specified condition becomes true?

A) Take B) Skip C) TakeWhile D) SkipWhile

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Answer & Solution

Answer: Option C

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36

In LINQ, what does the SingleOrDefault operator do?

A) Returns the first element of a sequence that satisfies a condition B) Returns the last element of a sequence that satisfies a condition C) Returns the number of elements in a sequence D) Returns the only element of a sequence that satisfies a condition, or a default value if no such element is found

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Answer & Solution

Answer: Option D

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37

What is the purpose of the AsQueryable operator in LINQ?

A) Converts a sequence to an IQueryable B) Converts a sequence to an IEnumerable C) Converts a sequence to a List D) Converts a sequence to an Array

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Answer & Solution

Answer: Option A

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38

Which LINQ operator is used to return elements from a sequence after a specified condition becomes true?

A) Take B) Skip C) TakeWhile D) SkipWhile

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Answer & Solution

Answer: Option D

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39

In LINQ, what does the LastOrDefault operator do?

A) Returns the first element of a sequence that satisfies a condition B) Returns the only element of a sequence that satisfies a condition, or a default value if no such element is found C) Returns the last element of a sequence that satisfies a condition, or a default value if no such element is found D) Returns the number of elements in a sequence

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Answer: Option C

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40

What is the purpose of the Except operator in LINQ?

A) Returns the intersection of two sequences B) Returns elements from the first sequence that are not present in the second sequence C) Returns the union of two sequences D) None of the above

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Answer: Option B

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LINQ (Language-Integrated Query) in C Sharp MCQ question and answer with solution | C# Program MCQs