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Embedded C Online Test

The Embedded C Test uses scenario-based MCQ questions to evaluate a candidate's ability to develop C/Emebdded 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.

Customized Based On:

  • Experience/ difficulty level
  • Multiple skills in 1 assessment
  • Job description/ role requirements

Covered Topics:

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

Human Resources Manager

Singapore Government

reduction in screening time

Sample Embedded C Online Test 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🔧 Skill💪 Difficulty⌛ Time
Memory Allocation
Check the following three C functions:
Which among these will likely cause issues with pointers?


  • A
  • B
  • C
  • A B
  • A C
  • B C
  • A B C
  • None of them
CMedium2 min
Pointers and Structs
What is the output of the following C code?


  • 1 2 3 4 1 2 4 5
  • 1 2 3 4 5 5 4 5
  • 1 2 3 4 3 4 5 5
  • 1 2 3 4 4 5 3 4
CMedium2 min
What is the output of the following C code?


  • pbls
  • pebles
  • pebbep
  • selbbep
  • selbbles
  • epbbels
  • ppeeblleess
CMedium2 min
Logic Black Box
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


  • Yes
  • No
  • Sometimes
Embedded CMedium3 min

How to use the Adaface Embedded C Online Test

Start screening candidates within minutes with the ready-to-go Embedded C Test

1. Choose the most appropriate test for your role

2. Start inviting candidates to complete the assessment

3. Receive real time notifications and shortlist the best candidates

OR Customize the Adaface Embedded C Test according to your job description

1. Get a custom assessment from our library of 500+ skills within 48 hours

2. Start inviting candidates to complete the assesment

3. Receive real time notifications and shortlist the best candidates

Adaface Embedded C Test is trusted by enterprises worldwide

Morgan Stanley
SG Government
Ernst and Young
Optimum Solutions
United Nations
Love Bonito

About the Adaface Embedded C Assessment Test

Evaluate embedded C technical and coding skills with Adaface skills assessment platform powered with an intelligent chatbot


Data types
Number Systems (Hex, Decimal and Binary)
Arrays (with pointers)
Structures (with pointers)
Const and volatile
MCU peripheral registers
Number Systems (Hex, Decimal and Binary)
Storage Classes
Header Files
Conditional Compilation
Linker and locator
Testing & Validation
I/O performance

Recommended Roles:

Embedded Electronics Engineers C
Embedded Software Engineers C
Embedded C Engineers
Firmware Engineers - Embedded C
Electronic & Electrical Engineers
Software Testing Specialists - Microcontrollers
Senior Embedded C Engineers

Why You Should Use This Embedded C Assessment Test

The Embedded C online assessment test reduces the administrative overhead of interviewing too many candidates and saves expensive engineering time by filtering out unqualified candidates.

The Adaface Embedded C test screen candidates for the typical skills recruiters look for in an Embedded software developer:

  • Expertise in writing Embedded C code for optimized I/O performance
  • Solid understanding of data structures, machine level language, assembly language, and electronic programmable device architecture
  • Familiarity with microcontrollers and embedded processors
  • C basics (Data types, variables definitions, storage class specifiers)
  • Bit manipulation techniques using bit-wise operators
  • Working with structures, bitfields, unions, bit extraction and memory-mapped peripheral registers
  • Pointers arithmetic and importance of pointer datatypes
  • Interpreting and using complex variable definitions involving a combination of const pointers, const data, volatile const, pointer and non-pointer variables
  • Creating registers from the address
  • Defining Peripheral address
  • Implicit and explicit casting
  • Importance of volatile during compiler optimization
  • Packing and unpacking of data for transmission and storage
  • Aligned and unaligned data access on structures
  • Use the debugger effectively to analyze and resolve bugs

Additionally the test has coding questions to evaluate hands-on C programming skills.

What questions are included for Senior Embedded C engineers?

The questions for Senior candidates are based on advanced Embedded C topics like:

  • Importance of structures in peripheral register access
  • Experience with Standard C and Embedded C libraries
  • Develop embedded drivers from scratch using information from the datasheet (GPIO drivers, TIMERS drivers, UART drivers)
  • Ability to work without third-party libraries or header files
  • Analyzing the chip documentation
  • De-coupling of I/O from real-time processing to avoid response time over-runs
  • Real-time system design concepts, decomposition of functions, and identification of key services
  • Structured interrupt handling

Additionally, the coding question will be of higher difficulty level compared to junior Embedded C tests.

Distribution Of Test Scores

The actual score distribution will vary based on your candidate pipeline quality, but you should typically expect ~20% of the candidates to do well on Adaface assessments.

The score distribution for our assessments follow the normal curve. This is a good sign- standardized tests like SAT and GRE follow the normal distribution (bell curve).

Status quo assessments typically have the exact opposite of the bell curve (too many candidates getting close to 0, too many candidates getting close to 100 and too few candidates in the middle). This is typically because they focus on theoretical questions or trick questions, which are very binary in nature- either you know the trick/ theory or you don’t.

How Adaface Is Different

Adaface conversational assessments are reflective of on-the-job skills and see an 86% completion rate as compared to ~50% for traditional assessment platforms.



Theoretical questions/ puzzles

Feels like a test

One-size-fits-all assessments




Questions for on-the-job skills




Embedded C Online 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.

What is a custom assessment?

Every role is different and requires a custom assessment to identify top candidates efficiently. Adaface subject matter experts understand your job description/ role requirements and pick the most relevant questions from our library of 10000+ questions to create a technical assessment that helps you find the qualified candidates in your candidate pipeline quickly. All custom assessments are set up based on the job description, role requirements, must-have skills, experience level and salary range within a maximum of 48 hours and you will get an email notification once it goes live.

Check out a sample assessment here (no credit card required).

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.

How is Adaface different from other assessment tools?

We believe that status quo tech assessment platforms are not a fair way for companies to evaluate engineers because they focus on trick questions/ puzzles/ niche algorithms. We started Adaface to help companies find great engineers by assessing on-the-job skills required for a role. Read more about why we started Adaface.

Here's what's different with Adaface:

  • High quality non-googleable questions that test for on-the-job skills as opposed to theoretical knowledge.
  • A friendly conversational assessment with a chatbot, instead of sending a "test" to a candidate. This translates to a higher completion rate. Adaface assessments (86% candidate completion rate), as opposed to traditional tests (40-50% candidate completion rate)
  • Customized assessments for 700+ skills at different experience levels.

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

We have the following anti-cheating features in place:

  • Web proctoring
  • Webcam proctoring
  • Plagairism detection
  • Non-googleable questions
  • 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?

The platform is completely self-serve, so here's one way to proceed:

  • You can sign up for free to get a feel for how it works.
  • The free trial includes one sample assessment (Java/ JavaScript) that you will find in your dashboard when you sign up. You can use it to review the quality of questions, and the candidate experience of a conversational test on Adaface.
  • To review the quality of questions, you can also review our public questions for 50+ skills here.
  • Once you're convinced that you want to try it out with real assessments and candidates, you can pick a plan according to your requirements.

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.

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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