BARC Syllabus & Exam Pattern 2026: Scientific Officer, Technical Officer, Cat-I & Cat-II Marking Scheme PDF

Bhabha Atomic Research Centre (BARC), functioning under the Department of Atomic Energy (DAE), conducts annual nationwide competitive recruitments to induct high-calibre scientists, engineers, and technical personnel into India’s premier nuclear research establishment. Whether you are aiming for prestigious Scientific Officer (Group-A) roles through the OCES/DGFS programs, supervisory roles as Category-I Stipendiary Trainees, or specialized workshop crafts under Category-II Stipendiary Trainees, mastering the official examination pattern, section-wise mark distribution, and syllabus is paramount. For live vacancy notifications, eligibility criteria, and direct online application links, visit the official BARC Recruitment 2026 Hub.

BARC Recruitment Architecture & Selection Stages 2026

The recruitment process at BARC is divided into distinct evaluation tiers according to cadre hierarchy and technical responsibilities:

BARC Scientific Officer (OCES/DGFS) Online CBT Exam Pattern

For engineering and science candidates electing to qualify via the BARC Online Examination, the computer-based test is held across multiple testing centres across India. The exam strictly evaluates core subject matter with zero questions on general knowledge or English grammar.

Discipline-Wise Detailed Syllabus for BARC OCES/DGFS Exam

The syllabus for the BARC Online Examination broadly mirrors the graduate GATE engineering curriculum, with high emphasis placed on conceptual mechanics, fundamental governing laws, and practical engineering derivations:

1. Mechanical Engineering (Discipline Code: 21)

• Thermodynamics & Thermal Engineering: First and Second Laws, Entropy, Exergy analysis, Pure substances, Steam tables & Mollier charts, Rankine cycle, Otto/Diesel/Dual cycles, Gas turbines, Heat exchangers (NTU and LMTD methods).
• Fluid Mechanics & Hydraulics: Fluid statics, Bernoulli’s equation, Navier-Stokes fundamentals, boundary layer theory, turbulent flow in pipes, compressible flow, centrifugal pumps and Pelton turbines.
• Heat & Mass Transfer: Conduction (steady and transient state), extended surfaces/fins, forced and natural convection correlations, radiation laws (Planck, Stefan-Boltzmann, radiation shape factors), boiling and condensation.
• Solid Mechanics & Machine Design: Stress-strain tensors, Mohr's circle, thin and thick cylinders, shear force & bending moment diagrams, deflection of beams, torsion of shafts, theories of failure, fatigue design (S-N curve, Soderberg/Goodman relations), design of shafts, springs, gears, and rolling contact bearings.
• Manufacturing & Industrial Engineering: Metal cutting mechanics, Merchant circle, tool life equations (Taylor’s formula), CNC machining, welding metallurgy, casting solidification, non-destructive testing (radiography, ultrasonic, dye penetrant), inventory control and linear programming.

2. Electrical Engineering (Discipline Code: 24)

• Electric Circuits & Electromagnetic Fields: Network theorems (Thevenin, Norton, Superposition, Maximum Power Transfer), transient analysis of RLC circuits, sinusoidal steady-state analysis, balanced three-phase circuits, Maxwell’s equations, wave propagation.
• Electrical Machines: Single-phase and three-phase transformers (equivalent circuit, testing, parallel operation, autotransformers), DC machines (armature reaction, speed control), 3-phase induction motors (torque-slip characteristics, starting methods), synchronous machines (voltage regulation, saliency, parallel operation).
• Power Systems & Protection: Transmission line modeling, ABCD parameters, power flow analysis (Gauss-Seidel, Newton-Raphson), symmetrical and unsymmetrical fault analysis, economic load dispatch, circuit breakers, protective relays (distance, differential, overcurrent).
• Control Systems: Transfer functions, block diagram algebra, signal flow graphs, transient response specifications, Routh-Hurwitz stability criterion, root locus technique, Nyquist and Bode plots, state-space representations.

3. Electronics & Communication / Instrumentation (Discipline Codes: 25 & 27)

• Electronic Devices & Analog Circuits: Energy bands in semiconductors, PN junction diodes, Zener diodes, BJT, MOSFET characteristics, biasing and small-signal low-frequency models, operational amplifiers (inverting/non-inverting, filters, Schmitt trigger, multivibrators).
• Digital Electronics & Microprocessors: Boolean algebra, logic gates, combinational circuit design (multiplexers, decoders), sequential circuits (flip-flops, counters, shift registers), semiconductor memories, 8085/8086 microprocessors and microcontroller architecture.
• Signals & Systems: Continuous-time and discrete-time signals, Fourier transform, Laplace transform, Z-transform, DTFT, FFT, linear time-invariant (LTI) systems.
• Sensors & Industrial Instrumentation: Transducers for measurement of temperature (RTD, thermocouples, thermistors), pressure (piezoelectric, capacitive), flow (orifice, electromagnetic, ultrasonic), and radiation monitoring instrumentation (Geiger-Muller counters, scintillation detectors).

4. Chemical Engineering (Discipline Code: 22)

• Process Calculations & Thermodynamics: Material and energy balances, degrees of freedom analysis, PVT behaviour of pure fluids, thermodynamic properties of fluids, phase equilibria (VLE, Raoult’s law), chemical reaction equilibria.
• Fluid Mechanics & Mechanical Operations: Fluid statics, laminar and turbulent flow, boundary layers, flow meters, pumps, particle size reduction, filtration, sedimentation, and fluidization.
• Heat Transfer: Conduction, convection, radiation, heat exchangers (shell and tube, plate), evaporators, reboilers, and condensation heat transfer.
• Mass Transfer Operations: Fick’s law, molecular diffusion, interphase mass transfer, distillation (McCabe-Thiele method), gas absorption, liquid-liquid extraction, adsorption, and drying.
• Chemical Reaction Engineering (CRE): Kinetics of homogeneous reactions, design of ideal reactors (batch, CSTR, PFR), residence time distribution (RTD), catalysts, and gas-solid catalytic reactions.

5. Computer Science & Information Technology (Discipline Code: 26)

• Algorithms & Data Structures: Asymptotic analysis (Big-O), divide and conquer, greedy algorithms, dynamic programming, sorting and searching, arrays, linked lists, stacks, queues, trees, binary search trees, binary heaps, graphs (BFS, DFS, Dijkstra, Prim/Kruskal).
• Theory of Computation & Compiler Design: Regular expressions, finite automata, context-free grammars, pushdown automata, Turing machines, decidability, lexical analysis, parsing (LL, LR), code generation and optimization.
• Operating Systems & Computer Networks: Processes, threads, CPU scheduling, synchronization, deadlocks, virtual memory, paging, file systems; OSI and TCP/IP stack, routing protocols, flow and error control, socket programming.
• Database Management Systems (DBMS): ER-model, relational algebra, SQL, normalization (1NF, 2NF, 3NF, BCNF), indexing, transaction processing, ACID properties, concurrency control.

Stipendiary Trainee Category-II (Artisan/Technician) Exam Pattern

Category-II selections for ITI trades and HSC Plant Operators are conducted in three structured stages:

The BARC Technical Interview: The Decisive 100% Merit Gate

Unlike UPSC or standard PSU recruitments where written marks and interview marks are blended, BARC bases 100% of final OCES/DGFS appointment offers solely on the candidate's performance in the Technical Personal Interview. Both the GATE score and Online CBT score serve exclusively as screening cutoff filters.

The interview is conducted in Mumbai by an expert board of 5 to 7 senior nuclear research scientists. Key dimensions evaluated include:

• First Principles Mastery: Candidates are asked to derive governing differential equations from absolute fundamentals without memorized formula shortcuts.
• Blackboard Problem Solving: Candidates work through real engineering boundary value problems on a physical blackboard in front of the board.
• Choice of Preferred Subjects: Candidates are invited to present 4 to 5 core subjects of their preference, followed by deep questioning testing the boundaries of theoretical and practical understanding.