Interview experience
DRDO Interview Questions
Overview
Section titled “Overview”DRDO runs two structurally different hiring pipelines - a GATE-based route for Scientist ‘B’ graduate/postgraduate entries via RAC, and a separate own-exam route for non-gazetted technical posts (STA-B, Technician-A) via CEPTAM.
DRDO interview process at a glance
Section titled “DRDO interview process at a glance”| Round | Duration | What it tests |
|---|---|---|
| GATE score shortlisting (Scientist ‘B’ / RAC route) | - | Valid GATE score in the matching discipline |
| Written/descriptive test (most disciplines, RAC route) | Varies | Core subject depth beyond GATE screening |
| Personal Interview (RAC route) | 30-45 min | Technical depth, defence-tech awareness, project discussion |
| Computer-Based Test - CBT (CEPTAM route, non-gazetted posts) | Multi-tier | General awareness, reasoning, quantitative aptitude, trade/technical knowledge |
| Trade/Skill Test (CEPTAM route) | Varies | Hands-on trade proficiency |
| Document verification & medical | - | Eligibility documents, category certificates, physical fitness |
GATE score shortlisting (Scientist ‘B’)
Section titled “GATE score shortlisting (Scientist ‘B’)”DRDO’s Scientist ‘B’ recruitment via RAC starts with shortlisting purely on your GATE score in the relevant engineering or science discipline - there’s no separate DRDO screening test at this stage.
Common questions
- N/A - this stage is a pure score-based shortlist, not a test with questions
Written/descriptive test (Scientist ‘B’, most disciplines)
Section titled “Written/descriptive test (Scientist ‘B’, most disciplines)”For most engineering disciplines, GATE-shortlisted candidates sit a written or descriptive test before the interview, going deeper into core subject fundamentals than GATE’s objective format allows. A few disciplines skip this and go straight to interview.
Common questions
- Descriptive/analytical questions on core subjects from your GATE discipline (e.g. mechanics, electronics, materials, depending on branch)
- Problem-solving questions that require worked derivations, not just multiple-choice recall
Personal Interview (Scientist ‘B’)
Section titled “Personal Interview (Scientist ‘B’)”The closing stage for RAC-route candidates: a panel interview covering core technical depth, awareness of DRDO’s programmes and defence-technology areas, and a detailed walkthrough of your final-year project or thesis.
Common questions
- Core-subject numericals and concept questions from your discipline
- Awareness of DRDO projects relevant to your field (missile systems, radar, materials research, electronics, etc.)
- Detailed project/thesis discussion - methodology, results, and design choices
- Why DRDO, and why defence R&D over a corporate or private-sector role
Sample answer frameworks are on the DRDO HR interview questions page.
Computer-Based Test and Trade/Skill Test (CEPTAM route)
Section titled “Computer-Based Test and Trade/Skill Test (CEPTAM route)”For non-gazetted technical posts like Senior Technical Assistant-B and Technician-A, CEPTAM runs its own Computer-Based Test - typically across multiple tiers - covering general awareness, reasoning, quantitative aptitude, and trade or technical knowledge specific to the post. Candidates who clear the CBT move to a hands-on Trade/Skill Test.
Common questions
- General awareness and current-affairs MCQs
- Quantitative aptitude and reasoning questions
- Trade/technical-knowledge questions specific to the post (e.g. electronics, mechanical, or ITI trade syllabus)
- Practical trade or skill demonstration relevant to the post applied for
RAC vs CEPTAM: why the recruitment route matters
Section titled “RAC vs CEPTAM: why the recruitment route matters”DRDO isn’t one hiring pipeline - it’s two, run by different internal bodies. RAC handles gazetted Scientist posts (Scientist ‘B’ and above) through GATE-based shortlisting, a discipline-dependent written test, and an interview. CEPTAM handles non-gazetted technical and support posts (STA-B, Technician-A, and similar) through its own Computer-Based Test and Trade/Skill Test, with no GATE requirement. Applying to the wrong prep track - say, GATE-focused prep for a CEPTAM CBT, or trade-syllabus prep for a Scientist ‘B’ interview - wastes real time, so confirm which recruitment body your target post falls under before you start.
Frequently asked questions about DRDO interviews
Section titled “Frequently asked questions about DRDO interviews”What is the DRDO interview process for freshers?
DRDO runs two very different recruitment routes depending on the post. For Scientist ‘B’ (the main entry for engineering/science graduates and postgraduates, via the Recruitment & Assessment Centre/RAC): 1. Shortlisting on your GATE score in the matching discipline. 2. For most disciplines, a written/descriptive test after shortlisting; for some disciplines DRDO skips the written test and goes straight from GATE score to interview. 3. A Personal Interview. For non-gazetted technical/admin posts like Senior Technical Assistant-B or Technician-A (via CEPTAM): DRDO’s own Computer-Based Test (CBT, often in two tiers), followed by a Trade/Skill Test, document verification, and medical exam - no GATE requirement at all.
Does DRDO recruit only through GATE, or does it also have its own exam?
Both, for different posts. Scientist ‘B’ - the main graduate-entry technical role - is recruited primarily through GATE score shortlisting via RAC, sometimes with an added written test depending on discipline. Non-gazetted technical and support posts (Senior Technical Assistant-B, Technician-A, and similar CEPTAM-recruited roles) don’t use GATE at all - they’re filled through DRDO’s own multi-tier Computer-Based Test plus a Trade/Skill Test.
What questions are asked in DRDO interviews?
For Scientist ‘B’ interviews: core subject questions from your GATE-syllabus discipline, defence-technology and DRDO-programme awareness questions, and detailed cross-questioning on your final-year project or thesis. For CEPTAM technical-post selection, the CBT covers general awareness, reasoning, quantitative aptitude, and trade/technical knowledge, followed by a hands-on trade or skill test relevant to the post.
How many rounds are there in the DRDO interview process?
For Scientist ‘B’ via RAC: GATE-score shortlisting, then (for most disciplines) a written test, then a Personal Interview - so two or three real stages depending on discipline. For CEPTAM technical/support posts: a multi-tier Computer-Based Test, a Trade/Skill Test, document verification, and a medical exam - with no GATE or scientist-style interview involved.
How should I prepare for DRDO interviews?
If you’re targeting Scientist ‘B’, prioritise a strong GATE score in your discipline first, then revise core subject fundamentals at GATE depth for the written test and interview, and prepare a clear narrative on your final-year project since panels probe it closely. If you’re applying for a CEPTAM technical post (STA-B, Technician-A), focus on general aptitude, reasoning, and your specific trade syllabus for the CBT, and practice the hands-on skill test relevant to your trade.
What is RAC and CEPTAM in DRDO recruitment?
RAC (Recruitment & Assessment Centre) handles DRDO’s gazetted Scientist posts - Scientist ‘B’ and above - largely through GATE score shortlisting. CEPTAM (Centre for Personnel Talent Management) handles non-gazetted technical and administrative posts like Senior Technical Assistant-B and Technician-A through DRDO’s own Computer-Based Test and trade/skill tests. They’re separate recruitment bodies with completely different selection processes, so check which one your target post falls under before you prep.