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About the test:

The Embedded C Test uses scenario-based MCQ questions to evaluate a candidate's ability to develop C/Embedded C drivers/ libraries and coding questions to evaluate hands-on C programming skills. The code-tracing MCQ questions evaluate Embedded C fundamentals (data types, variables, pointers), I/O Hardware Addressing, fixed-point arithmetic operations, accessing address spaces, Preprocessor directives and efficient application of object-oriented programming principles to firmware development.

Covered skills:

  • C basics (variables; data types; declarations; functions)
  • Pointers (with Arrays; Structures; Unions)
  • I/O in C and correlations in embedded systems
  • Internals of assembler and compiler
  • Compiler optimization
  • Header protection
  • Embedded C basics (registers; directives; drivers)
  • Bit Operations (Packaging data; unpacking data; bit manipulations)
  • Object-Oriented principles (Polymorphism; Inheritance; Encapsulation)
  • Debugging and error handling
  • Cross-compiling toolchains
  • Booting sequence

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9 reasons why
9 reasons why

Adaface Embedded C Test is the most accurate way to shortlist Embedded Software Engineers



Reason #1

Tests for on-the-job skills

The Embedded C 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 write well-structured and efficient C code
  • Familiarity with embedded systems and the use of registers, directives, and drivers
  • Proficiency in working with pointers in various scenarios including arrays, structures, and unions
  • Capability in performing bit operations such as packaging and unpacking data, as well as bit manipulations
  • Understanding of I/O in C and its correlation with embedded systems
  • Knowledge of object-oriented principles like polymorphism, inheritance, and encapsulation
  • Awareness of internals of assemblers and compilers
  • Proficiency in debugging and error handling
  • Ability to optimize code with the help of a compiler
  • Experience with cross-compiling toolchains
  • Understanding of header protection
  • Knowledge of the booting sequence in embedded systems
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
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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 Embedded C Test will be non-googleable.

🧐 Question

Easy

Logic Black Box
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Consider the following logic box. There are three inputs A, B, C and three outputs not A, not B and not C (not A = !A, not B = !B, not C = !C).

Is it possible to achieve the expected outputs from the inputs using:

- Only AND and OR gates
- Just two (2) NOT gates
- No NAND, NOR, XOR, or XNOR gates
 image

Medium

Memory Map
Memory Architecture
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Review the following Embedded Systems code and memory map of 16-bit microcontroller:
 image
 image
Here are the specifications of the microcontroller:

- The stack grows from area D, whereas the program and static variables are stored in area C
- ‘int’ in the system is a 16-bit number
- There is no operating system and no memory protection
- The program is compiled and loaded into area C
Pick the correct statements:

A: first_var, second_var and input will be in area D
B: first_var and second_var will be in area C, input will be in area D
C: If the contents of 0x0010 at the start of the program is 7, the program will print 0 and exit
D: If the contents of 0x0010 at the start of the program is 42, the program will print 0 and exit
E: If the contents of 0x0010 at the start of the program is 42, the program will overflow the stack overwriting the program and static variables region
F: If the program overflows and overwrites the program and static variables region, arbitrary data is executed as if it is the program, causing unpredictable results

Medium

Multi-tasking
Multi-tasking
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Review the following Embedded Systems code:
 image
Here’s the specification for the program:
- first_var and second_var are global variables shared among several threads
- first_lock and second_lock are mutex locks that protect access to first_var and second_var
- Reads and writes to variables first_var and second_var are not guaranteed to be atomic
- No locks must be acquired unnecessarily
- Acquire second_var lock first before acquiring first_var lock by any thread that is going to use both first_var and second_var
Assume that if a thread attempts to acquire a lock it already holds, then it is immediately granted the lock. Pick the correct statements:

A: The provided code does not meet the specification completely since second_lock is not acquired before acquiring first_lock for procedure 'foo'

B: Replacing foo with logic of foo1 makes sure locks are not acquired unnecessarily and  second_lock is acquired before acquiring first_lock

C: Replacing foo with logic of foo1 makes sure second_lock is acquired before acquiring first_lock but there are cases when second_lock is acquired unnecessarily (when first_var < input)

D: Replacing foo with logic of foo2 makes sure locks are not acquired unnecessarily

E: Replacing foo with logic of foo2 is optimized version of foo1 but there are cases when second_lock is still acquired unnecessarily (when first_var value changes from the time ‘res’ value is computed and by the first_lock is acquired again.

Medium

Memory Allocation
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Check the following three C functions:
 image
Which among these will likely cause issues with pointers?

Medium

Pointers and Structs
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What is the output of the following C code?
 image

Medium

Strings
Strings
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What is the output of the following C code?
 image

Easy

Registration Queue
Logic
Queues
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

Visitors Count
Strings
Logic
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

Easy

Logic Black Box

3 mins

Embedded Systems
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Medium

Memory Map
Memory Architecture

3 mins

Embedded Systems
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Medium

Multi-tasking
Multi-tasking

2 mins

Embedded Systems
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Medium

Memory Allocation

2 mins

C
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Medium

Pointers and Structs

2 mins

C
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Medium

Strings
Strings

2 mins

C
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Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Logic Black Box
Embedded Systems
Easy3 mins
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Memory Map
Memory Architecture
Embedded Systems
Medium3 mins
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Multi-tasking
Multi-tasking
Embedded Systems
Medium2 mins
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Memory Allocation
C
Medium2 mins
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Pointers and Structs
C
Medium2 mins
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Strings
Strings
C
Medium2 mins
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Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve
Reason #4

1200+ customers in 75 countries

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

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Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment Embedded C 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 Embedded C 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
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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 Embedded C Assessment Test

Why you should use Pre-employment Embedded C Online Test?

The Embedded C 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:

  • Expertise in C basics including variables, data types, declarations, and functions
  • Strong understanding of Embedded C basics including registers, directives, and drivers
  • Proficiency in working with Pointers, including Arrays, Structures, and Unions
  • In-depth knowledge of Bit Operations, including packaging data, unpacking data, and bit manipulations
  • Experience in I/O operations in C and its correlations in embedded systems
  • Familiarity with Object-Oriented principles such as Polymorphism, Inheritance, and Encapsulation
  • Understanding of internals of assembler and compiler
  • Ability to effectively debug code and handle errors
  • Knowledge of compiler optimization techniques
  • Experience with cross-compiling toolchains

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 Embedded C Online Test?

  • C basics:

    Understanding variables, data types, declarations, and functions in C is essential for embedded C programming as it forms the foundation for writing efficient and optimized code.

  • Embedded C basics:

    Mastering registers, directives, and drivers in embedded C is crucial for controlling and interacting with hardware components such as microcontrollers and peripherals.

  • Pointers:

    Pointers are a powerful feature in C that enable manipulation and access to memory addresses. Knowledge of pointers with arrays, structures, and unions is important for memory management and efficient data handling.

  • Bit Operations:

    Bit operations involve packaging and unpacking data at the bit level, as well as performing various bit manipulations such as setting, clearing, or toggling specific bits. This skill is significant in embedded systems where memory and computational resources are limited.

  • I/O in C and correlations in embedded systems:

    Understanding input/output operations in C and how they relate to embedded systems is crucial for developing real-time applications and efficient communication between hardware and software components.

  • Object-Oriented principles:

    Knowledge of object-oriented principles like polymorphism, inheritance, and encapsulation allows for the development of reusable and modular code, enhancing code organization and maintainability.

  • Internals of assembler and compiler:

    Understanding the internals of the assembler and compiler provides insights into the compilation process and enables optimization of code for better performance and efficiency.

  • Debugging and error handling:

    Proficiency in debugging techniques and error handling is crucial for troubleshooting and identifying and resolving issues in embedded C programs, ensuring reliable and robust applications.

  • Compiler optimization:

    Knowing how to optimize code using compiler-specific features and options enables the generation of faster and more efficient binaries, leading to improved performance in embedded systems.

  • Cross-compiling toolchains:

    Knowledge of cross-compiling toolchains is essential for developing software on one platform and generating executables for another platform, which is common in the embedded systems domain.

  • Header protection:

    Understanding header protection techniques helps prevent issues like multiple inclusion and conflicts between header files, ensuring cleaner and more manageable code in embedded C projects.

  • Booting sequence:

    Familiarity with the booting sequence of embedded systems is important for understanding the system startup process, initializing hardware components, and executing the main application code.

  • 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 Embedded C Test to be based on.

    Variables
    Data Types
    Declarations
    Functions
    Registers
    Directives
    Drivers
    Pointers
    Arrays
    Structures
    Unions
    Bit Operations
    Packaging Data
    Unpacking Data
    Bit Manipulations
    I/O in C
    Correlations in Embedded Systems
    Object-Oriented Principles
    Polymorphism
    Inheritance
    Encapsulation
    Assembler
    Compiler
    Debugging
    Error Handling
    Compiler Optimization
    Cross-Compiling Toolchains
    Header Protection
    Booting Sequence
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What roles can I use the Embedded C Online Test for?

  • Embedded Software Engineer
  • Firmware Engineer
  • Embedded Systems Developer
  • Microcontroller Engineer
  • Embedded Systems Consultant
  • Electronic & Electrical Engineers

How is the Embedded C 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

  • Expertise in header protection in C
  • Understanding of the booting sequence in embedded systems
  • Proficiency in handling interrupts and timers in embedded systems
  • Experience in working with various communication protocols (SPI, I2C, UART)
  • Understanding of software-hardware interactions in embedded systems
  • Knowledge of Real-Time Operating Systems (RTOS) and their implementation
  • Familiarity with low-level device drivers and peripheral programming
  • Proficiency in firmware development and debugging
  • Experience in low-power optimization techniques for embedded systems
  • Ability to perform system-level testing and verification
  • Expertise in designing and implementing efficient algorithms for embedded systems
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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.


85%
reduction in screening time

Embedded C Hiring Test FAQs

Can I evaluate C coding skills and Embedded C skills in the same test?

Yes. You can review our standard C online test to get a sense of what kind of questions will be used to evaluate C. The final test will have MCQ questions to evaluate C, Embedded C and coding questions to evaluate C coding skills.

Can I evaluate C++ and Embedded C in the same test?

Yes. You can review our standard C++ online test to get a sense of what kind of questions will be used to evaluate C++. The final test will have MCQ questions to evaluate C++, Embedded C and coding questions to evaluate C/C++ coding skills.

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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