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Research OrganizationDefence Research, Missiles, Radars & Strategic TechnologiesGATE / CBT Dual

Defence Research and Development Organisation (DRDO)

Recruitment Blueprint • Engineering Trainee & Scientific Officer Preparation

Official Careers Portal

DRDO is India's premier military research agency under the Ministry of Defence. Scientist 'B' posts are recruited through the Recruitment and Assessment Centre (RAC) primarily based on valid GATE scores followed by a rigorous personal interview, or through a dedicated RAC Written Test for specific non-GATE disciplines.

Notice Verification: Verified September 2026
GATE Requirement: Yes (Mandatory)
Recruited Engineering Branches:
ECEMechanicalCSE/ITEEChemicalCivilInstrumentation

Eligibility Criteria & Standards

Qualifying Degree

At least First Class Bachelor's Degree in Engineering or Technology in relevant subject

Minimum Aggregate Marks

First Class (typically 60% or 6.75 CGPA as prescribed by University)

Age Requirements

Maximum 28 years for Unreserved category (as per RAC Scientist B norms)

GATE Paper / Nationality

GATE Papers: EC, ME, CS, EE, CH, CE, IN • Citizen of India

Notice: Eligibility criteria and category relaxations are periodically updated. Always verify against the organization's definitive official recruitment notification at https://rac.gov.in before submitting an application.

Recruitment Stages & Evaluation Weightage

1

GATE Score Screening (Category I)

80% Shortlist Weightage (or 100% for interview shortlisting)

Shortlisting of candidates in a 1:5 ratio strictly based on GATE score merit in the corresponding paper.

2

Rigorous Technical Personal Interview (RAC)

80% Final Weightage (GATE 20% + Interview 80% or as per latest RAC scheme)

Comprehensive blackboard/whiteboard interview by a committee of 6 to 8 eminent defence scientists evaluating first-principles conceptual depth.

Exam & CBT Test Pattern Architecture

Testing ParameterPattern Specification
Total Questions100 Questions
Exam Duration180 Minutes (3 Hours)
Technical Discipline Weight100 Marks / Questions
General Aptitude & Reasoning0 Marks / Questions
Negative Marking SchemeSubjective / Objective pattern as per RAC notification
Discipline-Specific Blueprints

Technical Syllabus by Engineering Branch

Commonly tested core topics based on documented public examinations and national GATE blueprints.

Electronics & Communication (ECE)

  • Electromagnetics & Waveguides
  • Radar Signal Processing & Antennas
  • Digital Signal Processing (DSP) & Filters
  • Embedded Systems & Real-time OS
  • Electronic Devices & VLSI Design

Mechanical Engineering

  • Fluid Dynamics & Computational Fluid Dynamics (CFD)
  • Aerodynamics & Missile Trajectories
  • Advanced Solid Mechanics & Fracture Mechanics
  • Heat Transfer in Hypersonic Flow
  • Propulsion & Rocket Motor Design

Computer Science (CSE/IT)

  • Cryptographic Algorithms & Network Security
  • Parallel Computing & High-Performance Computing (HPC)
  • Data Structures, Graph Theory & Algorithms
  • Operating Systems Internals & Device Drivers
  • Artificial Intelligence & Computer Vision

Interview Evaluation & Viva Architecture

Interview Format: Deep Technical Blackboard Interview before a committee of Senior Defence Scientists

Panel Composition: 6-8 Senior Scientists / Lab Directors

Primary Evaluation Focus Areas:
  • First-principles derivations on the blackboard without relying on formula memorization
  • Deep interrogation of undergraduate engineering project and design choices
  • Ability to think logically when confronted with novel, unencountered defence engineering problems

Strategic Preparation Roadmap

  • 1DRDO interviews are legendary for theoretical depth: the panel will ask you to stand at a blackboard and derive equations from scratch (Navier-Stokes, Maxwell's equations, Nyquist stability, algorithm proofs).
  • 2Never try to guess or bluff in a DRDO interview; scientists will probe deeper into false claims. If you do not know a specific concept, politely state so.
  • 3Prepare 2 or 3 core technical subjects of your choice to an advanced postgraduate level.
Interactive Assessment Simulation

Practice & Diagnostic Test Papers

Unofficial original practice questions inspired by commonly tested skills. Not official previous examination papers.

Common Engineering Aptitude & CS/IT⏱ 25 Mins

DRDO RAC Scientist 'B' Technical Foundations Drill

📋 15 Questions • Negative Marking: 0.25
Launch Diagnostic Test
Official Source & Independence Disclaimer:InterviewJobs.in is an independent educational portal and is not affiliated with Defence Research and Development Organisation (DRDO), government recruitment boards, or official examination authorities. All organizational names and logos are used strictly as factual identifiers. Always check the official website (https://rac.gov.in) for definitive dates, notifications, and rules.