Linq(Computer Science ) Questions and answers for exam Preparation

Question 1. Choose the namespace in which Expression trees are encapsulated:

System.Linq
System.Linq.Expressions
System.Text
System.Collections.Generic

Explanation:-

Answer: Option B. -> System.Linq.Expressions

Question 2. Select the namespace which should be included while making use of LINQ operations:

System.Text
System.Collections.Generic
System.Linq
none of the above

Explanation:-

Answer: Option C. -> System.Linq

Question 3. What can LINQ be used to access?

Databases and Data Sources
Only Collections
Only Databases
Value Types

Explanation:-

Answer: Option A. -> Databases and Data Sources

Question 4. Can we use linq to query against a DataTable?

Yes
No
Either Yes or No
None of the above

Explanation:-

Answer: Option B. -> No

Question 5. Choose the namespace in which the interface IEnumerable is declared?

System.Collections
System.Collections.Generic
Both a & b
none of the above

Explanation:-

Answer: Option B. -> System.Collections.Generic

Question 6. Choose the wrong statement about the LINQ?

The main concept behind the linq is query
linq makes use of foreach loop to execute the query
It is not required that linq should make use of IEnumerable interface
none of the above

Explanation:-

Answer: Option C. -> It is not required that linq should make use of IEnumerable interface

Question 7. Assume 2 columns named as Product and Category how can be both sorted out based on first by category and then by product name?

var sortedProds = _db.Products.Orderby(c => c.Category)
var sortedProds = _db.Products.Orderby(c => c.Category) + ThenBy(n => n.Name)
var sortedProds = _db.Products.Orderby(c => c.Category) . ThenBy(n => n.Name)
none of the above

Explanation:-

Answer: Option C. -> var sortedProds = _db.Products.Orderby(c => c.Category) . ThenBy(n => n.Name)

Question 8. Which of the following namespace contains the LINQ to XML?

System.Xml.Linq
System.Linq;
System.Xml;
None of these

Explanation:-

Answer: Option A. -> System.Xml.Linq

Question 9. What do you use to retrieve the data in a particular order?

GroupBy
OrderBy
ThenBy
Zomato

Explanation:-

Answer: Option B. -> OrderBy

Question 10. Whose presentation was the best?

Aweez
Aweez, of course
Bruh, don't even ask
All of above

Explanation:-

Answer: Option D. -> All of above