The Defence Research and Development Organisation recruits through two entirely different mechanisms, and candidates routinely conflate them.
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Scientist ‘B’ is a permanent Group A Gazetted post at Level 10, basic ₹56,100, with total emoluments of approximately ₹1,00,000 per month at joining. The 2026 cycle — Advertisement No. 156 — carried 152 vacancies.
Junior and Senior Research Fellowships are contractual research engagements at ₹37,000 and ₹42,000 per month plus HRA, for a fixed term, with no guarantee of permanent absorption.
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Both are open to postgraduates. They are not the same opportunity, and the routes into them are opposite.
There is also a provision in the Scientist ‘B’ recruitment that postgraduates in Science should know before anything else: the tabulation route admits M.Sc and M.Tech candidates in specialised disciplines by direct interview, without a written test.
Overview
| Scientist ‘B’ | JRF / SRF | |
|---|---|---|
| Nature | Permanent, Group A Gazetted | Contractual fellowship |
| Pay | Level 10, ₹56,100 basic; gross approximately ₹1,00,000 | ₹37,000 (JRF) → ₹42,000 (SRF) + HRA |
| Recruiter | RAC — Recruitment & Assessment Centre | Individual labs, and RAC |
| Route | GATE score or CoT; tabulation route for specialised PG | GATE/NET + walk-in interview |
| Cycle | Periodic — 200–300 posts in recent cycles | Continuous, year-round |
| Absorption | It is the permanent post | No guarantee |
| Portal | rac.gov.in | drdo.gov.in and lab notifications |
1. Scientist ‘B’ — The Postgraduate Route
RAC’s own advertisement states the position precisely: it “invites online applications from graduate engineers and post graduates in Science” for recruitment to Scientist ‘B’ in DRDO, the Aeronautical Development Agency (ADA), and encadred posts in WESEE Delhi, CME Pune, AFMC Pune and the Selection Centres under Army, Navy and Air Headquarters.
Postgraduates in Science are explicitly invited — not accommodated as an afterthought.
The Two Routes, and the One That Matters for PG Candidates
| Route | Who | Selection |
|---|---|---|
| Engineering disciplines | B.E./B.Tech first class — 60% or CGPA 6.75/10 in Electronics, Mechanical, Computer Science, Aeronautical, Civil, Electrical, Metallurgy or Chemical | Valid GATE score or the Centralised Online Test (CoT) |
| Tabulation route | M.Sc/M.Tech postgraduates in materials science, aerospace, life sciences and other specialised areas | Direct interview — no written test |
Read the second row again. For advertised specialised vacancies, M.Sc and M.Tech postgraduates are selected by tabulation and direct interview, without a written examination.
This is a materially different proposition from the engineering route, which requires a valid GATE score and puts the candidate into a 1:10 shortlist against the national field.
Note also: GATE-route applicants are merged into the same merit list as CoT applicants for interview shortlisting. The two engineering routes converge; the tabulation route does not pass through either.
The 2026 Advertisement — Advt No. 156
| Aspect | Detail |
|---|---|
| Total vacancies | 152 |
| DRDO | 127 |
| ADA | 09 |
| Encadred MoD posts | 16 — WESEE Delhi, CME Pune, AFMC Pune, Selection Centre North (Jalandhar), Central (Bhopal), South (Bangalore) |
| Pay | Level-10, basic ₹56,100 |
| Total emoluments at joining | Approximately ₹1,00,000 per month |
| Application | Online mandatory, via rac.gov.in |
| Closing date | 21 days from the date of publication in Employment News |
| Fee | ₹100 for UR, EWS and OBC male candidates — non-transferable, non-refundable, online only. No fee for SC/ST/Divyangjan and women |
Note the closing date mechanism. It is 21 days from publication in Employment News — not a fixed calendar date. Candidates must track the publication date, and the window is three weeks.
Final-Year Candidates — DRDO Permits What ISRO Does Not
RAC invites applications “including students who have appeared in their final semester examinations.”
Such candidates may apply on the condition that they submit the degree or provisional degree certificate on or before a specified date.
This is a significant contrast with ISRO, where candidates whose results are awaited on the cut-off date are not eligible at all. DRDO permits provisional application; ISRO does not.
Foreign degrees require an equivalence certificate from the Association of Indian Universities, Delhi.
2. Selection for Scientist ‘B’ — The 80:20 Rule and Its Trap
| Stage | Detail |
|---|---|
| Shortlisting | On GATE score, in a ratio of 1:10, discipline-wise and category-wise |
| Confirmation | Shortlisted candidates confirm willingness and select a tentative interview date online |
| Personal Interview | At Delhi or another place decided by RAC/DRDO |
| Final merit | 80% weightage GATE score + 20% weightage Personal Interview, discipline-wise category-wise |
The Interview Minimum
This is the provision that eliminates candidates who have already been shortlisted.
Only candidates securing minimum qualifying marks in the Personal Interview are considered for the final merit list:
| Category | Minimum in interview |
|---|---|
| UR | 70% |
| EWS / OBC / SC / ST / Divyangjan | 60% |
A candidate with an outstanding GATE score who scores 68% in the interview as a UR candidate is not placed on the merit list at all — the 80% weightage becomes irrelevant. The interview is a gate, not merely a weighting.
Compare the structures across this series: ISRO is 50:50 written to interview. DRDO is 80:20 — but with a 70% interview floor. Neither permits the interview to be treated as a formality.
After Selection
Appointment is subject to:
- Qualifying the Medical Examination prescribed for Group ‘A’ Technical posts of the Government of India — with Field Service liability
- Verification of Character and Antecedents
“Field Service liability” is not a formality. It is a condition of the post.
The GATE Score Warning
RAC states this in unusually direct terms:
- “A wrongly filled GATE score may automatically result in a candidate not getting shortlisted for scrutiny.”
- “On verification, if it is found that the candidate’s GATE score is false, RAC reserves the right to initiate appropriate proceedings, including proceedings under the Bharatiya Nyaya Sanhita, 2023.”
Candidates must keep GATE login credentials ready — enrolment number, registration ID and GATE login password — to display GATE results on-screen at verification. A GATE scorecard and a screenshot of the GATE Results webpage displaying the score are both required.
Valid GATE years: 2023, 2024 or 2025 for the 2026 cycle — a three-year validity window.
On payment: RAC states that it “does not request any payment at any stage of the recruitment process except the application fee,” and that any such demand should be reported to the Chairman, RAC.
3. Scientist ‘B’ — Pay and Postings
| Component | Detail |
|---|---|
| Pay Level | Level 10, 7th CPC |
| Basic | ₹56,100 |
| Gross in-hand | Approximately ₹90,000 – ₹1,00,000 per month in metro postings |
| DA, HRA (24% X-class), Transport Allowance | As applicable |
| Project Allowance | Typically 25% of basic on operational projects — DRDO-specific |
The Project Allowance is worth noting. At approximately 25% of basic, it is a component no comparable post in this series carries, and it applies on operational projects.
The Labs
DRDO has 50+ laboratories across India:
| Location | Labs |
|---|---|
| Hyderabad | DRDL, ASL |
| Bengaluru | ADE, CABS, GTRE |
| Pune | ARDE, HEMRL, R&DE |
| Dehradun | DEAL, IRDE |
| Delhi | DIPAS |
| Kanpur | CFEES |
Posting depends on lab vacancy, discipline match and the candidate’s preference indicated during the application. Inter-lab transfer is possible after 3 years of service.
DRDO or ISRO?
| Feature | DRDO | ISRO |
|---|---|---|
| Entry pay | Level 10 | Level 10 |
| Discipline coverage | Broader — 50+ labs across Aeronautical, Naval, Missiles, Electronics Warfare, Life Sciences | Aerospace systems focus |
| Written test | Accepts GATE score | Conducts its own test |
| Vacancies per cycle | 200–300 | 60–110 |
| Final-year candidates | Permitted provisionally | Not eligible |
| Merit | 80% GATE + 20% Interview | 50% Written + 50% Interview |
Engineers often apply to both. For a postgraduate, DRDO’s tabulation route and broader life-sciences and materials coverage make it the wider door.
4. JRF and SRF — The Fellowship Route
Entirely different in character from Scientist ‘B’.
| Aspect | Detail |
|---|---|
| JRF stipend | ₹37,000 per month + HRA |
| SRF stipend | ₹42,000 per month + HRA |
| Upgrade | After two years as JRF, on satisfactory performance and assessment |
| Initial tenure | Two years, extendable |
| Eligibility | B.E./B.Tech with GATE, or M.Sc/M.Tech, with GATE or NET typically mandatory |
| Selection | Walk-in interview — no written exam in most cases |
| Fee | Nominal — ₹10 to ₹20 via RAC; usually no fee for direct walk-ins |
| Absorption | No guarantee. Purely contractual |
The model is decentralised and continuous. Individual DRDO laboratories release their own notifications based on project requirements, year-round. Labs actively recruiting in 2026 include CABS Bengaluru, DYSL, DEAL, ADRDE, INMAS, IRDE Dehradun, SAG Delhi, CAIR Bengaluru, DMSRDE Kanpur, Defence Laboratory Jodhpur and CFEES Delhi.
Research Associate (RA) posts are advertised alongside JRF at several labs, and are intended for candidates with higher research experience such as PhD holders.
The Walk-In — Practical Rules
- Report to the venue — usually the DRDO lab — between 08:00 AM and 09:30 AM. Latecomers are generally rejected.
- A written screening test — objective questions from the relevant GATE syllabus — is conducted only if the number of applicants is high. Only qualifiers face the panel.
- The panel typically consists of 3 to 5 senior scientists.
- Questions cover: core B.Tech/M.Sc project work, fundamental subject concepts, and application questions — for example, how you would design an antenna for a given frequency.
- No TA/DA is paid for attending the interview or for joining if selected.
- Original certificates are mandatory at the interview.
“The GATE score is often just an entry ticket; the final selection depends entirely on the walk-in interview.”
Note one divergence from Scientist ‘B’: several JRF notifications state that the qualifying degree must be completed and the certificate obtained by the closing date — final-year candidates are not eligible. This is lab-specific. Check the notification.
What the Fellowship Actually Leads To
Stated honestly by DRDO’s own notifications: the fellowship “does not confer any right for absorption in any DRDO laboratory.”
What it does provide:
- Hands-on research experience in advanced defence technologies
- Access to state-of-the-art infrastructure and mentorship under senior DRDO scientists
- PhD registration with associate universities including IITs and IISc
- A certificate of completion
- A recognised pathway: many former JRFs join DRDO as Scientist ‘B’ through the competitive examinations conducted by RAC
The honest framing: JRF is a two-year research engagement at ₹37,000 that builds the profile — and the GATE preparation — for the permanent Scientist ‘B’ route. It is a launchpad, not a destination.
5. Documents Checklist
For Scientist ‘B’:
- ☐ B.E./B.Tech first class — 60% or CGPA 6.75/10 — or M.Sc/M.Tech in the specialised discipline
- ☐ Valid GATE scorecard — 2023, 2024 or 2025
- ☐ Screenshot of the GATE Results webpage displaying the score
- ☐ GATE login credentials — enrolment number, registration ID, password
- ☐ Degree or provisional degree certificate by the specified date, for final-semester applicants
- ☐ AIU equivalence certificate, for foreign degrees
- ☐ Caste / EWS / Ex-serviceman / Disability documents
- ☐ Affidavit, where any name mismatch exists across documents
- ☐ Attachments sized 100 KB to 500 KB, legible on printout
For JRF/SRF:
- ☐ Qualifying degree and mark sheets
- ☐ GATE or NET scorecard, valid as on the closing date
- ☐ Self-attested copies of mark sheets and certificates
- ☐ Originals — mandatory at the interview
6. Assessment
Scientist ‘B’ — in favour:
- Permanent Group A Gazetted at entry
- Level 10, gross approximately ₹1,00,000, plus a Project Allowance at 25% of basic
- RAC explicitly invites postgraduates in Science
- The tabulation route selects M.Sc/M.Tech candidates by direct interview — no written test
- 200–300 posts per cycle — three to five times ISRO’s volume
- Final-year candidates may apply provisionally
- 50+ labs, broad discipline coverage, inter-lab transfer after 3 years
- Fee ₹100, and nil for women and reserved categories
Scientist ‘B’ — against:
- 70% minimum in the Personal Interview for UR candidates — a hard floor that voids a strong GATE score
- Field Service liability in the medical standard
- Closing date is 21 days from Employment News publication — easily missed
- GATE score errors carry consequences up to proceedings under the Bharatiya Nyaya Sanhita
JRF/SRF — in favour:
- ₹37,000 rising to ₹42,000 — comparable to entry-level salaries
- No written exam in most cases
- Continuous, year-round across 50+ labs
- PhD registration with IITs and IISc
- A recognised pathway to Scientist ‘B’
JRF/SRF — against:
- Purely contractual. No absorption right. After two years you seek other opportunities
- No TA/DA for the interview
- Decentralised — you must track individual lab notifications
Recommendations:
If you hold an M.Sc or M.Tech in a specialised discipline — materials science, aerospace, life sciences — check the tabulation route first. Direct interview, no written test, and a far narrower field than the GATE-route national pool.
If you are on the engineering route, treat the 70% interview minimum as the real bar, not the 80% GATE weighting. Shortlisting is 1:10 on GATE; selection requires clearing that floor.
If you are early-career and want research rather than a permanent post immediately, take the JRF — but take it understanding what DRDO states plainly: it confers no right of absorption. Use the two years for the PhD registration and the Scientist ‘B’ preparation.
And track both drdo.gov.in and rac.gov.in. The permanent posts come through RAC on a periodic cycle; the fellowships come from individual labs, continuously.
Frequently Asked Questions
Q1. Can a postgraduate apply for DRDO Scientist ‘B’? Yes. RAC’s advertisement “invites online applications from graduate engineers and post graduates in Science.” M.Sc/M.Tech postgraduates in materials science, aerospace, life sciences and other specialised areas can apply via the tabulation route — direct interview without a written test.
Q2. What is the DRDO Scientist ‘B’ salary? Level-10, basic ₹56,100, with total emoluments of approximately ₹1,00,000 per month at joining. Gross in-hand is approximately ₹90,000 – ₹1,00,000 in metro postings, including DA, HRA at 24% in X-class cities, Transport Allowance and a DRDO Project Allowance of typically 25% of basic on operational projects.
Q3. How is Scientist ‘B’ selection decided? Shortlisting is on GATE score at a 1:10 ratio, discipline-wise and category-wise. Final merit is 80% GATE score plus 20% Personal Interview. Only candidates securing 70% (UR) or 60% (EWS/OBC/SC/ST/Divyangjan) in the interview are considered for the final merit list.
Q4. Which GATE years are valid? 2023, 2024 or 2025 for the 2026 cycle — a three-year window. A wrongly filled GATE score may result in not being shortlisted, and a false score may attract proceedings under the Bharatiya Nyaya Sanhita, 2023.
Q5. Can final-year students apply? For Scientist ‘B’ — yes. RAC accepts applications from students who have appeared in their final semester examinations, subject to submitting the degree or provisional certificate by the specified date. For JRF — often no; several lab notifications require the degree to be completed by the closing date. Check the specific notification.
Q6. What is the DRDO JRF stipend? ₹37,000 per month plus HRA. After two years and a satisfactory assessment, the fellowship may be upgraded to Senior Research Fellow at ₹42,000 per month plus HRA.
Q7. Does a JRF lead to a permanent DRDO job? No. DRDO states that the fellowship confers no right of absorption. However, many former JRFs join DRDO as Scientist ‘B’ through the competitive examinations conducted by RAC, and the fellowship supports PhD registration with associate universities including IITs and IISc.
Q8. How does DRDO compare with ISRO? Both recruit at Level 10. DRDO has broader discipline coverage — 50+ labs across Aeronautical, Naval, Missiles, Electronics Warfare and Life Sciences — accepts GATE scores rather than conducting its own test, and offers 200–300 posts per cycle against ISRO’s 60–110. ISRO does not accept final-year candidates; DRDO does.
Disclaimer: This article is for general information only. Vacancy numbers, eligibility, routes, GATE validity years, selection weightage, interview qualifying marks, stipends, fees and closing dates are set by the official RAC advertisement or the individual laboratory’s notification and vary between cycles and labs. JRF and SRF are contractual fellowships and confer no right of absorption in DRDO. Candidates must read the official notification on rac.gov.in or drdo.gov.in before applying and treat it as the final authority.