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About the test:

The LINQ (Language-Integrated Query) Online Test uses scenario-based MCQs to evaluate candidates on their proficiency in LINQ, a powerful query language that enables developers to manipulate data in C# and other .NET languages. The test assesses candidates' ability to write LINQ queries to extract, transform, and filter data, their understanding of LINQ operators, expressions, object-oriented programming, data structures, database programming, debugging, and error handling.

Covered skills:

  • Query Expressions
  • Standard Query Operators
  • Join Operations
  • Grouping
  • Filtering
  • Lambda Expressions
  • Deferred Execution
  • Aggregation
  • Sorting
  • Data Transformation

9 reasons why
9 reasons why

Adaface LINQ Test is the most accurate way to shortlist LINQ Designers

Reason #1

Tests for on-the-job skills

The LINQ Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Ability to use Query Expressions effectively
  • Ability to utilize Lambda Expressions
  • Ability to apply Standard Query Operators
  • Understanding of Deferred Execution
  • Ability to perform Join Operations
  • Understanding of Aggregation
  • Ability to work with Grouping
  • Understanding of Sorting
  • Ability to apply Filtering
  • Ability to perform Data Transformation
Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface
Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 10,000+ questions. The actual questions on this LINQ Online Test will be non-googleable.

🧐 Question


base code and queries
Check the following base LINQ code and two LINQ queries that follow:
Which of the following statements are true about the output of CODE ONE with base code and CODE TWO with base code?


What does the following LINQ code output?
🧐 Question🔧 Skill


base code and queries

4 mins




2 mins

🧐 Question🔧 Skill💪 Difficulty⌛ Time
base code and queries
Medium4 mins
Easy2 mins
Reason #4

1200+ customers in 75 countries

customers in 75 countries

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

Brandon Lee, Head of People, Love, Bonito

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment LINQ Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the LINQ Online Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

View sample scorecard
Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring

Learn more

About the LINQ Assessment Test

Why you should use Pre-employment LINQ Online Test?

The LINQ Online Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

  • Understanding and implementing Query Expressions
  • Applying Lambda Expressions for efficient data manipulation
  • Utilizing Standard Query Operators for filtering and sorting
  • Understanding Deferred Execution and its impact on performance
  • Performing Join Operations for integrating multiple data sources
  • Applying Aggregation functions for summarizing data
  • Implementing Grouping for organizing data based on specific criteria
  • Sorting data using multiple criteria
  • Filtering data based on specific conditions
  • Performing Data Transformation to convert data into desired formats

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the LINQ Online Test?

  • Query Expressions

    Query expressions in LINQ provide a convenient way to write queries by using a SQL-like syntax. They allow developers to retrieve and manipulate data from various data sources effortlessly.

  • Lambda Expressions

    Lambda expressions are concise and powerful ways to write inline functions. These allow developers to create and use small, anonymous functions that can be used in LINQ queries for filtering, sorting, or transforming data more efficiently.

  • Standard Query Operators

    Standard Query Operators are predefined methods that provide a set of commonly used query operations in LINQ. These operators facilitate tasks such as filtering, projecting, sorting, aggregating, and joining data in a more structured and readable manner.

  • Deferred Execution

    Deferred execution is a feature of LINQ that postpones the actual execution of a query until the data is actually requested. This allows optimization and laziness in the execution of the query, resulting in better performance and memory management.

  • Join Operations

    Join operations in LINQ allow developers to combine data from multiple sources based on specified conditions. This skill is important to measure as it enables the assessment of a candidate's ability to write complex queries involving multiple tables or data sources.

  • Aggregation

    Aggregation in LINQ involves calculating a single value from a collection of values. This skill is important to measure as it demonstrates a candidate's understanding of performing calculations and summarizing data efficiently.

  • Grouping

    Grouping in LINQ allows developers to categorize data based on common attributes or values. This skill is important to measure as it reflects a candidate's ability to organize and analyze data in a structured and meaningful way.

  • Sorting

    Sorting in LINQ involves arranging data in a specific order based on one or more criteria. This skill is important to measure as it indicates a candidate's ability to retrieve and present data in a desired sequence, which is often crucial in data analysis and reporting.

  • Filtering

    Filtering in LINQ refers to the process of selecting specific elements from a collection based on specified conditions. This skill is important to measure as it demonstrates a candidate's ability to extract and retrieve relevant data, which is fundamental in data manipulation and analysis.

  • Data Transformation

    Data transformation in LINQ involves converting data from one form to another, often by applying various operations or functions. This skill is important to measure as it reflects a candidate's ability to manipulate and modify data in different ways to meet specific requirements and goals.

  • Full list of covered topics

    The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for LINQ Online Test to be based on.

    Basic LINQ Syntax
    Query Syntax vs Method Syntax
    Filtering Data with LINQ
    Sorting Data with LINQ
    Grouping Data with LINQ
    Aggregating Data with LINQ
    Joining Data with LINQ
    Lambda Expressions
    Deferred Execution and Immediate Execution
    Standard Query Operators - Where
    Standard Query Operators - Select
    Standard Query Operators - OrderBy
    Standard Query Operators - GroupBy
    Standard Query Operators - Join
    Standard Query Operators - Aggregate
    Standard Query Operators - Distinct
    Standard Query Operators - Any, All, Contains
    Standard Query Operators - Skip, Take
    Standard Query Operators - Union, Intersect, Except
    Standard Query Operators - Concat, Zip
    Data Transformation - Select, SelectMany
    Data Transformation - GroupBy, ToLookup
    Data Transformation - Into
    Data Transformation - Cast, OfType, AsQueryable
    Data Transformation - Where + Select
    Data Transformation - OrderBy + ThenBy
    Data Transformation - Join + GroupJoin
    Data Transformation - Skip + Take
    Deferred Execution - Lazy Loading
    Deferred Execution - Eager Loading
    Deferred Execution - ToList, ToArray, ToDictionary
    Deferred Execution - Count, Average, Min, Max, Sum
    Deferred Execution - First, FirstOrDefault, Last, LastOrDefault
    Deferred Execution - Any, All
    Deferred Execution - Contains
    Dot Notation vs Query Syntax
    Method Syntax Chaining
    Anonymous Types in LINQ
    Nullable Types in LINQ
    Using LINQ with Collections
    Using LINQ with SQL Queries
    Combining LINQ with Other Techniques
    Performance Optimization of LINQ Queries
    Tips and Best Practices for LINQ
    LINQ Error Handling and Exception Handling
    LINQ Query Optimization
    Performance Comparison of Different LINQ Operators
    Working with Complex Data Structures
    LINQ Integration with Entity Framework
    LINQ Integration with WPF and WinForms
    LINQ Integration with ASP.NET MVC
    LINQ Integration with ASP.NET Web API
    LINQ Integration with Xamarin
    LINQ Integration with Unity
    LINQ Integration with Microsoft Azure
    LINQ Integration with MongoDB
    LINQ Integration with SQL Server
    LINQ Integration with Oracle Database
    LINQ Integration with MySQL
    LINQ Integration with PostgreSQL
    LINQ Integration with SQLite

What roles can I use the LINQ Online Test for?

  • LINQ Designer
  • C# .NET Developer
  • .NET Architect

How is the LINQ Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

  • Utilizing LINQ functions for querying databases
  • Optimizing LINQ queries for improved performance
  • Understanding and implementing advanced LINQ features
  • Applying LINQ to XML for querying and manipulating XML documents
  • Using LINQ to Objects for querying in-memory collections
  • Utilizing LINQ to SQL for database querying and mapping
  • Implementing LINQ to Entities for querying and working with entity data models
  • Applying LINQ to DataSet for querying and manipulating relational data
  • Understanding LINQ expressions and query syntax
  • Applying LINQ for data analysis and reporting
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The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.

reduction in screening time

LINQ Hiring Test FAQs

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Screen proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser
  • Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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Ready to use the Adaface LINQ Online Test?
40 min tests.
No trick questions.
Accurate shortlisting.
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