01
ISRO Part B (Aptitude) Syllabus — Common for ALL Branches
Numerical Reasoning | Logical Reasoning | Abstract Reasoning | Diagrammatic Reasoning. 15 questions x 1 mark = 15 marks. The same pattern applies for ECE, EEE, ME, and CS.
ISRO Scientist/Engineer
ISRO Scientist/Engineer Syllabus 2025-2026 — Branch-wise Guide
The complete branch-wise ISRO Scientist/Engineer syllabus for 2025-2026 — Part A (technical) for ECE, EEE, Mechanical, and CS, plus the common Part B aptitude section.
Exam-focused Syllabus
Part A technical + Part B aptitude coverage
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Overview
The ISRO Scientist/Engineer written test has two parts for all disciplines. Part A is technical — 80 questions covering your engineering specialisation. Part B is Aptitude and Ability — 15 questions covering numerical, logical, abstract, and diagrammatic reasoning. Here is the complete branch-wise syllabus breakdown.
Part A Syllabus — ECE (Electronics and Communication Engineering)
| Subject | Topics |
|---|---|
| Networks, Signals & Systems | Circuit theorems, AC analysis, Laplace/Fourier/Z transforms, LTI systems, sampling |
| Electronic Devices & Circuits | PN junction, BJT, MOSFET, amplifier biasing, small-signal models, feedback |
| Analog Circuits | Op-amp, filters, oscillators, ADC/DAC, signal generators |
| Digital Electronics | Boolean algebra, combinational and sequential circuits, PLDs, counters |
| Control Systems | Transfer functions, stability (Routh, Nyquist, Bode), root locus, PID |
| Communications | AM/FM/PM, noise, digital modulation (ASK/FSK/PSK/QAM), Shannon capacity |
| Electromagnetics | Maxwell's equations, wave propagation, transmission lines, waveguides, antennas |
| Microprocessors | 8085/8086 architecture, assembly, interfacing, I/O |
Part A Syllabus — EEE (Electrical and Electronics Engineering)
| Subject | Topics |
|---|---|
| Circuits & Networks | KVL/KCL, Thevenin/Norton, AC circuits, transients, two-port networks |
| Electrical Machines | DC machines, transformers, induction motors, synchronous machines |
| Power Electronics | Thyristors, converters, choppers, inverters, PWM |
| Control Systems | Transfer functions, stability, Bode/Nyquist/root locus, PID, state space |
| Power Systems | Load flow, fault analysis, protection, transmission lines, stability |
| Signals & Systems | Laplace/Fourier/Z transforms, LTI systems, convolution |
| Measurements & Instruments | Bridges, transducers, CRO, error analysis, digital meters |
| Basic Electronics | PN junction, BJT, op-amps, digital circuits |
Part A Syllabus — Mechanical Engineering
| Subject | Topics |
|---|---|
| Engineering Mechanics | Static equilibrium, dynamics, kinematics, friction |
| Thermodynamics | Laws, entropy, gas cycles, steam cycles, refrigeration |
| Fluid Mechanics | Bernoulli, pipe flow, turbines, pumps, compressors |
| Heat & Mass Transfer | Conduction, convection, radiation, heat exchangers |
| Theory of Machines | Kinematics, cams, gears, vibration, balancing, governors |
| Machine Design | Failure theories, shafts, bearings, springs, fatigue |
| Manufacturing | Casting, welding, machining, CNC, metrology |
| Engineering Materials | Crystal structure, heat treatment, alloys, composites |
Part A Syllabus — CS (Computer Science and Engineering)
| Subject | Topics |
|---|---|
| Data Structures & Algorithms | Trees, graphs, sorting, hashing, DP, greedy, complexity |
| Theory of Computation | Automata, regular languages, CFG, PDA, Turing machines, decidability |
| Operating Systems | Process scheduling, memory management, file systems, deadlocks |
| Database Systems | ER model, SQL, normalisation, B+ trees, transactions, concurrency |
| Computer Networks | OSI/TCP-IP, routing, IP addressing, transport protocols, security |
| Computer Organisation | ISA, pipelining, cache, memory hierarchy, I/O |
| Digital Logic | Boolean algebra, combinational and sequential circuits |
| Compiler Design | Lexing, parsing, semantic analysis, intermediate code, code generation |
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FAQ
Frequently Asked Questions
Quick answers to questions ISRO aspirants most often ask.
Q01
What is the ISRO syllabus for 2025-2026?
The ISRO Scientist/Engineer syllabus has Part A (technical, 80 marks) covering your engineering discipline, and Part B (aptitude, 15 marks) covering numerical, logical, abstract, and diagrammatic reasoning. Syllabus details are the same as GATE for your branch, with minor variations.
Q02
Is the ISRO syllabus the same as GATE?
For most branches, ISRO and GATE share 75-85% syllabus overlap. ISRO sometimes includes topics like Microprocessors (ECE), Measurements (EEE), or Manufacturing (ME) at higher weightage than GATE.
Q03
Where can I download the official ISRO syllabus?
The official ISRO syllabus is published in the recruitment notification PDF on isro.gov.in. BTechTutor also provides simplified syllabus PDFs and topic weightage analysis — available free using the download links above.
Q04
What is the Part B aptitude syllabus for ISRO?
Part B has 15 questions covering Numerical Reasoning, Logical Reasoning, Abstract Reasoning, and Diagrammatic Reasoning — 15 marks in total. It is the same aptitude pattern for every discipline (ECE, EEE, ME, CS), regardless of your engineering branch.
Q05
How has the ISRO syllabus changed in 2025-2026?
The core ISRO syllabus remains largely consistent year to year. Changes in individual notifications are minor topic additions or rewordings. Always verify against the specific recruitment notification for your discipline.