LINQ Test

Question 2: LINQ supports ________ syntax.

• C# and F#
• VB and F#
• C# and VB
• All of the above

Question 3: Which of the following supports LINQ queries?

• Object collection
• XML Document
• Entity Framework
• All of the above

Question 4: A class must implement ____________ interface in order to provide querying facility using LINQ.

• IEnumerator or IQueryable
• IEnumerable or IQueryable
• Enumerable or Queryable
• None of the above

Question 5: Which of the following statement is TRUE?

• LINQ API is a bunch of extension methods included in System.Linq.Enumerable and System.Linq.Queryable class.
• LINQ API is a bunch of abstract methods included in Enumerable and Queryable classes.
• LINQ API is bunch of queries written in C# and VB.
• None of the above

Question 6: LINQ supports which of the following syntaxes?

• Query syntax
• Method syntax
• A & B both
• Only A

Question 7: The following query is an example of ________ syntax.

var teenAgerStudent = from s in studentList
where s.Age > 12 && s.Age < 20
select s;

• Method syntax
• Query syntax
• C#
• VB

Question 8: The following query is an example of _______ syntax.

var std = students.Where(s => s.Age > 12).ToList<Student>();

• Query syntax
• Method syntax
• SQL
• All of the above

Question 9: Which of the following statement is TRUE?

• The lambda expression is nothing but extension method.
• The lambda expression is a shorter way of representing anonymous methods.
• The lambda expression is a style of representing dynamic types.
• The lambda expression is nothing but static delegate method.

Question 10: s => s.Age > 12 && s.Age < 20; is an example of _______.

• Expression tree
• LINQ query
• C# condition
• Lambda expression

Question 11: Lambda expression can be invoked like a delegate.

• True
• False

Question 12: OrderByDescending is NOT supported in _______.

• Query syntax
• Method syntax
• Lambda expression
• VB Method syntax.

Question 13: Which of the following standard query operator returns the differences between the two collections?

• Distinct
• Except
• Intersect
• Union

Question 14: Which of the following standard query operator returns the unique elements from two collections?

• Distinct
• Except
• Intersect
• Union

Question 15: Which of the following standard query operator returns the common elements from two collections?

• Distinct
• Except
• Intersect
• Union

Question 16: Which of the following is TRUE?

• An Expression compiles into executable code.
• An Expression compiles into expression tree.
• An expression compiles into native code.
• An Expression compiles into machine code.

Question 17: Expression tree is _________.

• Tree of expression in C# or VB.
• Executable tree structure.
• In-memory representation of lambda expression.
• Binary tree like data structure for better LINQ support.

Question 18: Which of the following operators executes LINQ query immediately and gets the result?

• 'To' operators
• Casting operators
• Grouping operators
• Joining operators

Question 19: What is the difference between First and FirstOrDefault?

• First throws an exception whereas FirstOrDefault returns default value, if no elements found for specified criteria.
• First returns NULL whereas FirstOrDefault returns default value, if no elements found for specified criteria.
• First throws an exception whereas FirstOrDefault returns NULL, if no elements found for specified criteria.
• First returns void whereas FirstOrDefault returns NULL value, if no elements found for specified criteria.

Question 20: Third party data providers must implement ________ interface, in order to support LINQ.

• IEnumerable
• IQueryable
• ICollection
• IEnumerator