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About the test:

The BI Developer Test is preferred by recruiters to assess on-the-job skills of candidates before an interview. It reduces technical screening time by 80% by enabling employers to identify qualified candidates.

Covered skills:

  • Power Pivot
  • Power Map
  • Power Query
  • Data source connectors
See all covered skills

9 reasons why
9 reasons why

Adaface BI Developer Test is the most accurate way to shortlist candidates



Reason #1

Tests for on-the-job skills

The BI Developer 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.

Non-googleable questions & proctoring features enable you to be comfortable with conducting assessments online. The BI Developer Test is ideal for helping recruiters identify which candidates have the skills to do well on the job.

Reason #2

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.

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.

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

🧐 Question

Medium

Default summarization
Data Visualisation
Solve
Review the following table in Power BI:
 image
Here’s the visualisation generated when Book and ReadingChallenges columns are added to a table visualisation:
 image
Why do we see only 4 rows?

Medium

Many-to-one error
Data Modeling
Solve
Consider the following two tables in Power BI:
 image
We received the following error when we tried to set many-to-one cardinality between devices to users tables: “The cardinality you selected isn’t valid for this relationship”. What should we do before creating the many-to-one relationship?

Medium

Power Query Functions
Power Query
Solve
Review the following Microsoft SQL Server table:
 image
Complete the following Power Query formula used to create a custom column to replace the numbers present in last 11 characters of ISBN with 11 ‘*’. Example ‘978-0-365-51051-4’ is converted to ‘978-0-***-*****-*’
 image
A: Text.Insert
B: Text.Replace
C: Text.Start
D: Text.End

Easy

DAX
Solve
We want to create a DAX formula in Power BI that automatically calculates the previous month number. If month is May, the formula would return 4. We have already created the DAX formula: 
Today Month = MONTH (Sales[Todays Date])
Which of the DAX formulas below would be the right choice next?
A: Previous Month = Sales[Today Month]-1
B: Previous Month = PREVIOUSMONTH(Sales[Today Month])
C: Previous Month = STARTOFMONTH(Sales[Today Month])-1
D: Previous Month = IF (Sales[Today Month] =1, 12,Sales[Today Month]-1) (correct)

Medium

Sample data in Power BI
Power Query
Solve
Consider the following Microsoft SQL Server tables:
 image
Which of the following will enable us to import sample data from Sales table in Power BI Desktop?

A: Query Editor → Filter table by Sale Date
B: Power BI Model → Create a calculated table
C: Query Editor → Create a custom column using sample function
D: Query Editor → Add SELECT statement with WHERE clause on Date

Medium

Calculated Properties
Data Analysis
Solve
Here’s sample data imported into Tableau:
 image
Assume only three rows of data is present in the source. Once the data is imported, we added to new calculated fields:

Measure 1 with the formula: SUM([Profit])/SUM([Sales])
Measure 2 with the formula: SUM([Profit]/[Sales])

If we dragged Profit, Sales, Measure 1 and Measure 2 in the viewer as shown here:
 image
Pick the correct statements regarding columns Measure 1, Measure 2 and the row Grand total:
A: Values of Measure 1 would be 0.08, 0.075 and 0.1
B: Values of Measure 2 would be 0.08, 0.075 and 0.1
C: Values of Measure 1 would be 0.08, 0.769 and 0.08
D: Values of Measure 2 would be 0.08, 0.769 and 0.08
E: Values of Measure 1 would be 0.08, 0.155 and 0.255
F: Values of Measure 2 would be 0.08, 0.155 and 0.255
G: Grand total of Measure 1 would be 0.08
H: Grand total of Measure 2 would be 0.08
I: Grand total of Measure 1 would be 0.255
J: Grand total of Measure 2 would be 0.255

Easy

Change display icon
Solve
What steps would you take to change the following view so that Office Supplies is represented by a different symbol?
 image
A: Click on shapes in the marks area. Then select Office Supplies and the icon of choice and click okay.
B: Right-click on product category, select default properties, and select shape. Then select Office Supplies and the icon of choice and click okay.
C: Right click on the square and select "change shape" from the popup menu. Select the icon of choice and click okay.
D: A, B or C
E: None of these would work

Easy

Pie Chart
Data Analysis
Charts
Solve
We have the following dataset in Tableau:
 image
Which of the following Marks settings will result in following Pie chart?
 image
A: Drag Name to Color
B: Drag Share to Color
C: Drag Name to Label
D: Drag Share to Label
E: Drag Name to Angle
F: Drag Share to Angle
G: Drag Name to Detail

Easy

CSV load data
Solve
Consider the following file:
 image
The file might have incomplete data stored with ! or ?. Which of the following R snippets will load the file completely?
 image

Medium

Dataframe Transform
Solve
Review the following Dataframe 'bazinga':
 image
Which of the following commands would turn it into the Dataframe shown below:
 image
 image

Hard

Session
File Handling
Dictionary
Solve
 image
The function high_sess should compute the highest number of events per session of each user in the database by reading a comma-separated value input file of session data. The result should be returned from the function as a dictionary. The first column of each line in the input file is expected to contain the user’s name represented as a string. The second column is expected to contain an integer representing the events in a session. Here is an example input file:
Tony,10
Stark,12
Black,25
Your program should ignore a non-conforming line like this one.
Stark,3
Widow,6
Widow,14
The resulting return value for this file should be the following dictionary: { 'Stark':12, 'Black':25, 'Tony':10, 'Widow':14 }
What should replace the CODE TO FILL line to complete the function?
 image

Medium

ZeroDivisionError and IndexError
Exceptions
Solve
What will the following Python code output?
 image

Easy

Max Code
Arrays
Solve
Below are code lines to create a Python function. Ignoring indentation, what lines should be used and in what order for the following function to be complete:
 image

Medium

Multi Select
Solve
Consider the following SQL table:
 image
How many rows does the following SQL query return?
 image

Easy

Select & IN
Solve
Consider the following SQL table:
 image
Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
 image

Medium

With, AVG & SUM
Solve
Consider the following SQL table:
 image
How many tuples does the following query return?
 image

Easy

Registration Queue
Logic
Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount.
For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition.
⚠️⚠️⚠️ Note:
- The first line of the input is the length of the array. The second line contains all the elements of the array.
- The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function.
- You need to "print" the final result (not return it) to pass the test cases.

For the example discussed above, the input will be:
5
20 70 -40 30 -10

Your code needs to print the following to the standard output:
20 70 30 -40 -10

Medium

Longest Road
logic
hashmaps
Solve
A startup company E-Motors is building driverless automated cars. The car contains a sensor that checks the road quality for the next N meters to decide the optimal speed at which the cars should move. We are given recorded data by the sensor in the form of an array, where each element of the array is the rating given to 1 meter of the road in sequence. 

The rating given by the sensor is from 1 to 100, where 100 represents the road with the best condition, and any rating above 60 is optimal. Find the longest stretch of road in meters that is categorized as optimal by the sensor.

The input is an array of "strings" which needs to be converted from string to integer/number inside the function.

Medium

Visitors Count
Strings
Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. 
Example:

Input:
WWMMWWCCC

Expected Output: 
4W3C2M

Explanation: 
‘W’ has the highest count, then ‘C’, then ‘M’. 
⚠️⚠️⚠️ Note:
- The input is already parsed and passed to a function.
- You need to "print" the final result (not return it) to pass the test cases.
- If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’.
- If any of them have the same count, the output should follow this order - M, W, C.
🧐 Question🔧 Skill

Medium

Default summarization
Data Visualisation
2 mins
Power BI
Solve

Medium

Many-to-one error
Data Modeling
2 mins
Power BI
Solve

Medium

Power Query Functions
Power Query
2 mins
Power BI
Solve

Easy

DAX
3 mins
Power BI
Solve

Medium

Sample data in Power BI
Power Query
2 mins
Power BI
Solve

Medium

Calculated Properties
Data Analysis
3 mins
Tableau
Solve

Easy

Change display icon
2 mins
Tableau
Solve

Easy

Pie Chart
Data Analysis
Charts
3 mins
Tableau
Solve

Easy

CSV load data
2 mins
R
Solve

Medium

Dataframe Transform
3 mins
R
Solve

Hard

Session
File Handling
Dictionary
2 mins
Python
Solve

Medium

ZeroDivisionError and IndexError
Exceptions
2 mins
Python
Solve

Easy

Max Code
Arrays
2 mins
Python
Solve

Medium

Multi Select
2 mins
SQL
Solve

Easy

Select & IN
3 mins
SQL
Solve

Medium

With, AVG & SUM
2 mins
SQL
Solve

Easy

Registration Queue
Logic
30 mins
Coding
Solve

Medium

Longest Road
logic
hashmaps
25 mins
Coding
Solve

Medium

Visitors Count
Strings
30 mins
Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Default summarization
Data Visualisation
Power BI
Medium2 mins
Solve
Many-to-one error
Data Modeling
Power BI
Medium2 mins
Solve
Power Query Functions
Power Query
Power BI
Medium2 mins
Solve
DAX
Power BI
Easy3 mins
Solve
Sample data in Power BI
Power Query
Power BI
Medium2 mins
Solve
Calculated Properties
Data Analysis
Tableau
Medium3 mins
Solve
Change display icon
Tableau
Easy2 mins
Solve
Pie Chart
Data Analysis
Charts
Tableau
Easy3 mins
Solve
CSV load data
R
Easy2 mins
Solve
Dataframe Transform
R
Medium3 mins
Solve
Session
File Handling
Dictionary
Python
Hard2 mins
Solve
ZeroDivisionError and IndexError
Exceptions
Python
Medium2 mins
Solve
Max Code
Arrays
Python
Easy2 mins
Solve
Multi Select
SQL
Medium2 mins
Solve
Select & IN
SQL
Easy3 mins
Solve
With, AVG & SUM
SQL
Medium2 mins
Solve
Registration Queue
Logic
Coding
Easy30 minsSolve
Longest Road
logic
hashmaps
Coding
Medium25 minsSolve
Visitors Count
Strings
Coding
Medium30 minsSolve
Reason #4

1200+ customers in 75 countries

Brandon

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 BI Developer 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.

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the BI Developer 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.

Reason #7

Detailed scorecards & comparative results

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.

Reason #9

Advanced Proctoring


What topics are covered in the BI Developer Test?

Power Pivot enables you to import millions of rows from heterogeneous sources of data into a single Excel sheet.

Power Pivot

Power Query helps in finding, editing and loading external data.

Power Query

Power Map is an Excel add-in that provides a powerful set of tools to help us visualize and gain insight into large sets of data that have a geo-coded component.

Power Map
Data source connectors
Import to Power BI
Loading data

To do basic calculation and data analysis on data in power pivot, we use Data Analysis Expression (DAX).

DAX
Power BI Conditional Column
Template files
Dashboard sharing
Direct Query
Visualising data

Slicers in Power BI are the simple forms of filters that play a key role in designing customized charts and reports on the Power BI Desktop.

Slicers
Bookmarks
Dates

Content packs for services are pre-built solutions for popular services.

Content packs
Data View
Data Integration
File Optimization

Power Desktop is an aggregated tool of Power Query, Power View, and Power Pivot.

Power BI Desktop
Data sources
Data connectors
Data types
Marks
Extracts
Sort & Filters
Actions
Drill
Aggregations
Tableau Desktop
Layouts
Formatting
Distribution & Publishing
Charts & graphs
Dashboards
Formatting
Custom fields and calculations
Tableau Server
Dimensions and measures
Calculations & LOD
Parameters and Legends
Analytics with R & tools
Introduction to Statistics
Data Manipulation using R
Machine Learning Techniques using R
Exploratory Data Analysis
Regression Analysis
Data Science Basics
String Manipulation
Vector
Matrix
Dataframe
CSV
Rmarkdown
linear regression

A confusion matrix can be used to evaluate the accuracy of the model built.

confusion matrix
Random Forest
Analytics with R & tools
package
R6 Class
shinyR

The apply function allows one to make entry-by-entry changes to data frames and matrices.

apply function
Clustering
kmeans clustering
hierarchical clustering

Rattle is a popular GUI for data mining using R.

rattle
White Noise model

Principal Component Analysis is a method for dimensionality reduction.

Principal Component Analysis

initialize() function is used to initialize the private data members while declaring the object.

initialize()
evaluate_model()
Predictive Mean Matching
preloaded datasets
next
custom function
by()
factor variable
Radix
R decision tree
Data import
Strings and Numbers
String Formatting
Lists, Dictionaries, Tuples, and Sets
Collections
Functions and lambdas
Decorators
Scope
args/kwargs and default parameter values
The concept of mutability
Built-in Functions
Debugging and Error Handling
Type hinting
Modules and installing libraries
Object-Oriented Programming
Functional Programming
Lambdas
Decorators
Generators
Composition and Inheritance
File I/O
Database interactions
Unit testing
Regex (Regular Expressions)
Web Scraping
Algorithms and Data Structures
Asynchronous programming
Closures
The Relational Model
SQL Basics
SQL Functions
Data Modification Language
Data Query Language
CRUD
SQL Filtering / WHERE Statement
Subqueries
Indexes
3 Valued Logic
SQL JOINS
Window Functions
Date Filtering and Timestamps
Aggregate Functions
Operator Precedence
ORDER BY
GROUP BY
Top-Down Design
Bottom-Up Design
Entity Relationship Diagram
Normalization
Database Types
Multi-Table SELECT
Permission Management
Backup Strategies
Transactions
Data Types
Views
Sharding
Replication
Backups
Vertical + Horizontal Scaling
Distributed vs Centralized Databases
Database Security
SQL Injections
Access Control
Computer fundamentals
Letter Coding
Number Coding
Substitution
Coding-Decoding Puzzles
Non-verbal Reasoning
SQL concepts
Business analysis
Coding-Decoding
Programming languages
Computer architecture
Basic DBMS concepts
SOLID principles
Automation systems
Decision making
Non-verbal Reasoning
Problem-solving approach
Singapore government logo

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.


85%
reduction in screening time

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.

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
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser

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.

Join 1200+ companies in 75+ countries.
Try the most candidate friendly skills assessment tool today.
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40 min tests.
No trick questions.
Accurate shortlisting.
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