🚀 Indian Space Research Organisation (ISRO) – ICRB
ISRO Syllabus 2026 – Scientist/Engineer SC Exam Pattern, Branch-wise Topics & PDF Download
✅ Updated 2026
320+ Vacancies
📚 All Branches Covered
📥 PDF Available
🌐 isro.gov.in
📢 ISRO Syllabus 2026 has been officially released on isro.gov.in. ISRO Centralized Recruitment Board (ICRB) has announced 320+ vacancies for Scientist/Engineer posts across Mechanical, Electronics, Computer Science and other branches. This page covers the complete branch-wise syllabus, exam pattern, eligibility, salary, and preparation tips for ISRO Scientist/Engineer SC exam 2026.
The Indian Space Research Organisation (ISRO), established in 1969, is one of the most prestigious space agencies in the world — home to missions like Chandrayaan, Mangalyaan, and Gaganyaan. Every year, ISRO ICRB (Centralized Recruitment Board) conducts the Scientist/Engineer SC recruitment exam to bring talented engineers on board. Cracking this exam is a dream for millions of engineering graduates across India.
The ISRO Scientist/Engineer exam 2026 consists of two parts — a discipline-specific core engineering paper and a general aptitude paper, followed by a personal interview. The syllabus is based on B.E./B.Tech undergraduate engineering curriculum and varies by branch. Below, we have provided the complete, updated, branch-wise syllabus with exam pattern, marking scheme, and section-by-section topic breakdown.
📋 Table of Contents
- Exam Overview
- Eligibility Criteria
- Exam Pattern & Marking Scheme
- Mechanical Engineering Syllabus
- Electronics & Communication Syllabus
- Computer Science Syllabus
- Civil Engineering Syllabus
- Electrical Engineering Syllabus
- General Aptitude Syllabus (All Branches)
- Selection Process
- Salary & Pay Scale
- Preparation Tips & Books
- Frequently Asked Questions
1. ISRO Scientist/Engineer 2026 – Exam Overview
Organisation
Indian Space Research Organisation (ISRO)
Conducting Body
ISRO Centralized Recruitment Board (ICRB)
Post Name
Scientist / Engineer – SC & SD
Total Vacancies (2026)
320+ Posts (various disciplines)
Exam Mode
Computer Based Test (CBT) / Written Test
Total Questions
95 Questions (80 Tech + 15 Aptitude)
Total Marks
100 Marks
Exam Duration
120 Minutes (2 Hours)
Negative Marking
1/3 mark (Part A only)
Official Website
isro.gov.in / icrb.res.in
🏛️ Branches Covered
⚙️
Mechanical
📡
Electronics & Communication
💻
Computer Science
🏗️
Civil
⚡
Electrical
❄️
Refrigeration & AC
2. ISRO Scientist/Engineer 2026 – Eligibility Criteria
| Criteria | Details |
|---|---|
| Educational Qualification | B.E. / B.Tech in relevant engineering discipline from a recognized University / Institute |
| Minimum Marks | 65% aggregate marks or 6.84 CGPA on a 10-point scale |
| Final Year Students | Eligible to apply — must complete degree before document verification / joining |
| Lateral Entry | Eligible with First Class degree + 65% marks or 6.84 CGPA |
| Age Limit (General) | Maximum 28 years as on the last date of application |
| Age Relaxation – SC/ST | 5 years relaxation (max 33 years) |
| Age Relaxation – OBC | 3 years relaxation (max 31 years) |
| Age Relaxation – PwBD | 10 years relaxation for General (13 for OBC, 15 for SC/ST) |
| Nationality | Indian Citizen |
✅ Eligible Candidates
- B.E./B.Tech with ≥65% or 6.84 CGPA
- Final year students (pending degree)
- Lateral entry degree holders (First Class)
- Age ≤ 28 years (General)
❌ Not Eligible
- B.E./B.Tech with < 65% marks
- Diploma holders (without degree)
- Candidates above age limit
- Non-relevant branch candidates
3. ISRO Exam Pattern & Marking Scheme 2026
| Part | Section | Questions | Marks | Negative Marking |
|---|---|---|---|---|
| Part A | Core Engineering (Discipline-specific) | 80 | 80 | Yes – 1/3 per wrong answer |
| Part B | General Aptitude & Reasoning | 15 | 20 | No negative marking |
| Total | 95 | 100 | ||
⚙️ Part A – Core Engineering
Questions80
Marks80 (1 mark each)
Negative Marking-1/3 per wrong
Weightage80%
ContentBranch-specific topics
🧠 Part B – General Aptitude
Questions15
Marks20
Negative MarkingNone ✅
Weightage20%
ContentReasoning + Aptitude
📊 Minimum Qualifying Marks
| Category | Minimum Qualifying Marks (Written) |
|---|---|
| General / EWS | 60 out of 100 marks |
| OBC (Non-Creamy Layer) | 55 out of 100 marks |
| SC / ST / PwBD | 50 out of 100 marks |
⚠️ Important: Duration of exam is 120 minutes (2 hours). Only candidates qualifying the written test are shortlisted for interview in a 1:5 ratio based on merit.
4. ISRO Mechanical Engineering Syllabus 2026
⚙️ Engineering Mechanics
- Free-body diagrams & equilibrium
- Friction – rolling, belt-pulley, brakes
- Trusses and frames
- Virtual work
- Kinematics of rigid bodies
- Impulse & momentum
- Lagrange's equation
🔩 Strength of Materials
- Stress-strain diagrams
- Elastic constants, Poisson's ratio
- Mohr's circle for stress/strain
- Bending moment & shear force
- Thin & thick cylinders
- Euler's column theory
- Deflection of beams
🌡️ Thermodynamics
- Laws of Thermodynamics
- Thermodynamic cycles – Carnot, Rankine, Brayton
- Properties of pure substances
- Refrigeration & heat pump cycles
- Air standard cycles
- Psychrometry
🔄 Theory of Machines
- Displacement, velocity, acceleration analysis
- Cams, gears, gear trains
- Flywheels and governors
- Balancing of reciprocating masses
- Gyroscope
- Vibrations – free & forced
🏭 Manufacturing Engineering
- Casting, forming, joining processes
- Metal cutting – tool geometry, forces
- Machining processes – turning, drilling, milling
- Metrology & inspection
- Powder metallurgy
- CNC machining basics
🌊 Fluid Mechanics
- Properties of fluids
- Fluid statics
- Bernoulli's equation & applications
- Laminar & turbulent flow
- Boundary layer theory
- Flow through pipes
- Compressible flow
5. ISRO Electronics & Communication Engineering Syllabus 2026
📡 Analog Circuits
- Small signal equivalent circuits
- Biasing of BJT & FET
- Amplifiers – single & multi-stage
- Feedback amplifiers
- Power amplifiers
- Oscillators – RC, LC, Crystal
- Op-Amp applications
🔢 Digital Circuits
- Boolean algebra & minimization
- Logic gates – TTL, CMOS
- Combinational circuits
- Sequential circuits – FF, counters, registers
- ADC & DAC converters
- Memory – RAM, ROM, Flash
- Microprocessors – 8085/8086
📶 Signals & Systems
- LTI systems – convolution
- Fourier series & Transform
- Laplace & Z-transforms
- Sampling theorem
- Discrete time signal processing
- DFT and FFT
📻 Communication Systems
- Amplitude, Frequency, Phase modulation
- Demodulation techniques
- Noise in communication
- Digital modulation – ASK, FSK, PSK, QAM
- Multiplexing – TDM, FDM, CDM
- Satellite & mobile communication basics
📐 Electromagnetic Theory
- Maxwell's equations
- Plane wave propagation
- Transmission lines
- Waveguides
- Antenna basics – dipole, arrays
- Radar fundamentals
🎛️ Control Systems
- Transfer functions & block diagrams
- Signal flow graphs – Mason's rule
- Time domain analysis
- Frequency domain – Bode, Nyquist
- Stability – Routh-Hurwitz
- PID controllers
- State space analysis
6. ISRO Computer Science Engineering Syllabus 2026
🗃️ Data Structures & Algorithms
- Arrays, Linked Lists, Stacks, Queues
- Trees – BST, AVL, Heap, B-tree
- Graphs – BFS, DFS, shortest path
- Sorting – Quick, Merge, Heap, Radix
- Hashing & collision resolution
- Dynamic programming
- Complexity analysis – Big-O
🖥️ Operating Systems
- Process management & scheduling
- Threads & concurrency
- Memory management – paging, segmentation
- Virtual memory & page replacement
- File systems
- Deadlock – detection, prevention
- I/O management
🗄️ Database Management Systems
- ER model & relational model
- SQL – DDL, DML, DCL, TCL
- Normalization – 1NF to BCNF
- Transactions – ACID properties
- Concurrency control
- Indexing & B+ trees
- NoSQL basics
🌐 Computer Networks
- OSI & TCP/IP model
- Data link protocols
- IP addressing & subnetting
- Routing protocols – OSPF, BGP, RIP
- TCP, UDP protocols
- HTTP, FTP, DNS, SMTP
- Network security basics
🔌 Computer Organization & Architecture
- Number systems & Boolean algebra
- CPU design – ALU, control unit
- Instruction set architecture
- Pipeline & hazards
- Memory hierarchy – cache, RAM
- I/O interfacing
- RISC vs CISC
🔧 Programming & Software Engineering
- C, C++, Java programming
- Object-oriented programming concepts
- Compiler design – parsing, lexing
- Software development lifecycle
- Software testing & debugging
- Version control – Git basics
- Web technologies – HTML, CSS, JS basics
7. ISRO Civil Engineering Syllabus 2026
🏗️ Structural Engineering
- Stress, strain, elastic constants
- Bending moment & shear force diagrams
- Analysis of trusses & frames
- RCC design – beams, columns, slabs
- Steel structure design
- Pre-stressed concrete basics
🌱 Geotechnical Engineering
- Soil classification & properties
- Effective stress & consolidation
- Permeability & seepage
- Shear strength of soils
- Foundation design
- Earth retaining structures
💧 Fluid Mechanics & Hydraulics
- Properties of fluids
- Flow through pipes
- Open channel flow
- Hydraulic machines – pumps & turbines
- Groundwater hydrology
- Irrigation engineering basics
🛣️ Transportation Engineering
- Highway design & alignment
- Pavement design – flexible & rigid
- Traffic engineering
- Railway engineering basics
- Airport planning basics
- Highway materials testing
8. ISRO Electrical Engineering Syllabus 2026
⚡ Electric Circuits
- Network theorems – Thevenin, Norton, Superposition
- KVL & KCL
- AC circuit analysis
- Resonance in circuits
- Two-port networks
- Transient analysis
🔋 Electrical Machines
- Transformers – single & three phase
- DC machines – generators & motors
- Induction motors
- Synchronous machines
- Special machines – stepper, BLDC
- Drives & control of motors
🔌 Power Systems
- Power generation – thermal, hydro, nuclear
- Transmission & distribution
- Load flow analysis
- Fault analysis – symmetrical
- Circuit breakers & protection
- Power factor correction
📊 Measurements & Instrumentation
- Measuring instruments – moving coil, iron
- Bridges – Wheatstone, Maxwell
- CRO & signal generators
- Transducers & sensors
- Data acquisition basics
- Error analysis
9. General Aptitude Syllabus – Part B (All Branches)
Part B is common for all engineering branches. It carries 15 questions (20 marks) with no negative marking — so attempt all questions!
🔢 Quantitative Aptitude
- Number system & HCF/LCM
- Percentage, Profit & Loss
- Ratio & Proportion
- Simple & Compound Interest
- Time, Speed & Distance
- Time & Work
- Mensuration – Area & Volume
- Data Interpretation
🧠 Logical Reasoning
- Analogy & Classification
- Number & Alphabet series
- Coding-Decoding
- Blood Relations
- Direction Sense
- Syllogism
- Seating Arrangements
- Venn diagrams
💡 Pro Tip: Since Part B has no negative marking, always attempt all 15 aptitude questions. Even guessing gives a 25% chance of scoring — never leave Part B blank!
10. ISRO Scientist/Engineer – Selection Process 2026
1
Online Application
isro.gov.in / icrb.res.in
2
Written Test (CBT)
Part A + Part B, 120 min
3
Shortlisting
1:5 ratio based on merit
4
Personal Interview
100 marks – Technical + HR
5
Document Verification
Original certificate check
6
Medical Fitness
Health checkup
7
Final Merit List
50% Written + 50% Interview
🎯 Interview Evaluation Criteria
| Component | Marks | Details |
|---|---|---|
| Technical Knowledge | 40 | Core engineering concepts, problem-solving ability |
| Communication Skills | 20 | Clarity, confidence, presentation |
| Aptitude & Awareness | 20 | Space awareness, current affairs in science & technology |
| Academic Achievements | 20 | CGPA, institute ranking (IIT/NIT/IISc bonus), publications |
| Total Interview | 100 | 50% weightage in final merit |
11. ISRO Scientist/Engineer – Salary & Benefits 2026
Pay Level (7th CPC)
Level 10
Rs.56,100 – Rs.1,77,500
Basic Pay (Starting)
₹56,100
per month
Gross Salary (with DA+HRA)
₹70,000–80,000
approximate per month
In-hand Take-home
~₹60,000+
after deductions
| Benefit / Allowance | Details |
|---|---|
| Dearness Allowance (DA) | As per Government of India rates (revised quarterly) |
| House Rent Allowance (HRA) | 16–24% of basic pay depending on city classification |
| Transport Allowance (TA) | As per 7th CPC norms |
| Medical Facilities | CGHS / ISRO medical scheme for self and family |
| Provident Fund (PF) | 10% of basic pay (employer contribution) |
| Leave Travel Concession | Once in 2 years for self & family |
| Quarters / Accommodation | ISRO township housing (subject to availability) |
| Education Allowance | For children's education (as per rules) |
| Career Growth | Regular promotions – Scientist SC → SD → SE → SF → SG → Outstanding Scientist → Distinguished Scientist |
12. Preparation Tips & Recommended Books
- Start with GATE Syllabus: ISRO Part A closely mirrors the GATE syllabus for your branch. If you've prepared for GATE, you're 70% ready for ISRO. Use GATE previous papers as primary practice material.
- Focus on High-Weightage Topics: For Mechanical — Thermodynamics + TOM + Strength of Materials carry 50%+ weight. For CS — Data Structures + OS + DBMS + CN are the core. Identify and master your branch's top 5 subjects.
- Solve Last 10 Years' ISRO Papers: ISRO repeats concepts (not questions) across years. Previous papers reveal the difficulty level, topic distribution, and frequently tested subtopics. Download from isro.gov.in.
- Part B = Free Marks: No negative marking in aptitude. Spend 20 minutes on it, score 15–18 marks. Attempt all 15 questions — even random guesses have 25% hit rate.
- Time Management in Exam: 95 questions in 120 minutes = 75 seconds per question. Skip tough Part A questions on first pass, complete Part B fully, then return to skipped questions.
- Prepare for Interview Separately: Interview carries 50% weight — many candidates lose the final selection here. Read about ISRO missions (Chandrayaan, Mangalyaan, Gaganyaan, Aditya-L1), space technology news, and your core branch concepts thoroughly.
- Mock Tests Are Essential: Take at least 20 full-length mock tests before the exam. Platforms like Testbook, Made Easy Prime, and Adda247 offer ISRO-specific test series.
📚 Recommended Books
| Subject | Recommended Books |
|---|---|
| Mechanical Engineering | R.K. Bansal (Fluid Mechanics), VB Bhandari (Machine Design), PK Nag (Thermodynamics) |
| Electronics & Communication | Sedra & Smith (Analog), Morris Mano (Digital), Haykin (Communications), Hayt (EM) |
| Computer Science | Cormen (Algorithms), Tanenbaum (OS & Networks), Ramakrishnan (DBMS), Patterson (COA) |
| Electrical Engineering | Chapman (Electrical Machines), Nagrath & Kothari (Power Systems), Golding (Measurements) |
| Civil Engineering | R.K. Bansal (Hydraulics), Arora & Bindra (Soil Mechanics), Krishna Raju (RCC Design) |
| Quantitative Aptitude | R.S. Aggarwal (Quantitative Aptitude), R.S. Aggarwal (Verbal & Non-Verbal Reasoning) |
| ISRO-specific | ISRO Scientist/Engineer by Disha Experts (branch-wise), GKP publications |
13. Frequently Asked Questions (FAQs)
Q1. What is the exam pattern for ISRO Scientist/Engineer SC 2026?
The ISRO SC exam has 95 total questions: Part A – 80 Core Engineering questions (1 mark each, 1/3 negative marking) and Part B – 15 General Aptitude questions (no negative marking). Total marks: 100. Duration: 120 minutes. Final selection is 50% written + 50% interview.
Q2. Is there negative marking in ISRO exam 2026?
Yes, but only in Part A (Core Engineering). A penalty of 1/3 mark is deducted for each wrong answer. Part B (General Aptitude, 15 questions) has no negative marking — so always attempt all aptitude questions. Unattempted questions carry no penalty in either part.
Q3. What is the eligibility for ISRO Scientist/Engineer 2026?
Candidates must hold B.E./B.Tech in the relevant engineering discipline with minimum 65% aggregate marks or 6.84/10 CGPA from a recognized university. Maximum age is 28 years (General), 31 years (OBC), 33 years (SC/ST). Final year students can also apply.
Q4. What is the salary of ISRO Scientist/Engineer SC?
ISRO Scientist/Engineer SC receives a starting basic pay of Rs.56,100/month in Pay Level 10 (7th CPC). With DA, HRA, TA and other allowances, the gross salary is approximately Rs.70,000–80,000 per month. Take-home salary is around Rs.60,000+.
Q5. What subjects are in ISRO Computer Science exam syllabus?
ISRO CS syllabus includes: Data Structures & Algorithms, Operating Systems, Database Management Systems (SQL, normalization, transactions), Computer Networks (OSI model, TCP/IP, routing), Computer Organization & Architecture, Programming in C/C++/Java, Compiler Design, Software Engineering, and Web Technologies.
Q6. What is the selection process for ISRO Scientist/Engineer 2026?
Two-stage process: (1) Written CBT – Part A (Core Engineering, 80 marks) + Part B (General Aptitude, 20 marks), total 100 marks; (2) Personal Interview – 100 marks covering technical knowledge, communication, ISRO awareness, and academic achievements. Final merit = 50% written + 50% interview.
Q7. Is GATE score required for ISRO exam 2026?
No, GATE score is not mandatory for ISRO Scientist/Engineer SC recruitment. ISRO conducts its own written examination through ICRB. However, for certain higher-level or research positions (SD/SE posts), a valid GATE 2025/2026 score may be considered during shortlisting. Always check the specific notification.
Q8. How many vacancies are in ISRO Scientist/Engineer 2026?
ISRO announced 320 vacancies for Scientist/Engineer posts in 2026 across disciplines including Mechanical, Electronics, and Computer Science. Additionally, SAC ISRO announced 49 vacancies in January 2026. Total vacancies may vary — check isro.gov.in for latest notifications.
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⚠️ Disclaimer: All syllabus details are based on official ISRO ICRB notifications and isro.gov.in. Syllabus and exam pattern may be revised by ISRO — always verify from isro.gov.in before starting preparation. Rojgar Samachar Zone is not responsible for any discrepancies with the official notification.
⚠️ Disclaimer: All syllabus details are based on official ISRO ICRB notifications and isro.gov.in. Syllabus and exam pattern may be revised by ISRO — always verify from isro.gov.in before starting preparation. Rojgar Samachar Zone is not responsible for any discrepancies with the official notification.
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