Preparing for an ISRO VSSC recruitment exam requires clarity on the exam pattern, marking scheme, and detailed syllabus. In this guide, we’ll walk you through everything you need to know—post by post—so you can structure your preparation strategically.
The Vikram Sarabhai Space Centre (VSSC), one of ISRO’s premier centres, has released multiple notifications (Advt. No. VSSC-334 & 335) for various technical and scientific posts. Across most technical roles, the selection process comprises:
Written Test
80 Multiple Choice Questions
Duration: 90 minutes
Marks: +1 for correct, –0.33 for wrong
Pass Criteria:
UR & EWS: ≥32/80
Other categories: ≥24/80
Skill/Trade Test (for Technician-B & Technical Assistant)
Ratio: 1:5 (minimum 10 candidates)
| Post | Written Test | Skill/Trade Test | Pass Marks |
|---|---|---|---|
| Scientist/Engineer-SC | 80 Qs, 90 mins, +1/–0.33 | N/A | 32/80 (UR/EWS) |
| Technical Assistant | 80 Qs, 90 mins, +1/–0.33 | Trade Test | 32/80 (UR/EWS) |
| Technician-B (ITI Welder) | 80 Qs, 90 mins, +1/–0.33 | Practical Test | 32/80 (UR/EWS) |
Streams Covered: Mechanical, Electrical, Electronics, Computer Science, Civil, etc.
| Stream | Key Topics |
|---|---|
| Mechanical Engineering | Statics & Dynamics, Strength of Materials, Thermodynamics & Heat Engines, Fluid Mechanics, Theory of Machines, Manufacturing Processes |
| Electrical Engineering | Circuit Theory, Control Systems, Electrical Machines, Power Systems, Measurements & Instrumentation |
| Electronics & Comm. Engg. | Analog & Digital Electronics, Signals & Systems, Microprocessors & Microcontrollers, Communication Systems, Electronic Devices |
| Computer Science | Data Structures & Algorithms, OS, DBMS, Computer Networks, Theory of Computation, Software Engineering |
| Subject Area | Topics |
|---|---|
| Mechanical | Fluid Mechanics, Automobile Engineering, Manufacturing Technology, Industrial Engineering & Management, Strength of Materials, Thermodynamics, Hydraulics, Theory of Machines |
| Electronics & Communication | Electronic Devices, Analog & Digital Circuits, Signals & Systems, Communication Systems |
| Computer Science & IT | Computer Architecture, Operating Systems, DBMS, Computer Networks, Web Technologies |
| Trade | Core Topics |
|---|---|
| Welder | Safety & First Aid, Hand & Power Tools, Welding Processes (Arc, Gas), Heat Treatment, Metallurgy, Welding Symbols |
| Electrician | Safety Rules, Wiring & Earthing, Measuring Instruments, Transformers, Switchgear, Installation Practices |
| Fitter | Workshop Tools, Fits & Tolerances, Assembly Drawings, Machining Processes, Measurement Techniques |
(Subject areas as per syllabus compendium for Technician-B recruitment.) |
| Notification | Post | PDF Link |
|---|---|---|
| Advt. No. VSSC-334 | Scientist/Engineer-SC | Download PDF |
| Advt. No. VSSC-335 | Technical Assistant | Download PDF |
| Technician-B Syllabus | Welder/Electrician etc. | See Technician-B table above |
Curriculum‐Based Revision: Since the test is strictly curriculum-based, align your study plan with your academic syllabus.
Practice MCQs: Regularly solve previous year questions and mock tests to build speed and accuracy.
Focus on Fundamentals: Strong grasp of core principles (e.g., thermodynamics, circuit laws) boosts problem‐solving.
Time Management: Simulate exam conditions (80 Qs in 90 mins) to refine your pacing.
Skill Test Drills: For Technician-B and Technical Assistant, practice hands-on tasks under timed conditions.
Q1: Where can I download the official ISRO VSSC Syllabus 2025 PDF?
You can download it from the VSSC website under the “Recruitment” section or via the direct links above
Q2: Is there negative marking in the written test?
Yes, each wrong answer carries a penalty of –0.33 marks
Q3: How many questions are there, and what is the duration?
The paper has 80 questions to be completed in 90 minutes, with +1 for correct answers
Q4: What topics should I prioritize?
Focus first on subjects with higher weightage in your stream (e.g., engineering core subjects), then general aptitude and reasoning.
Arming yourself with the right syllabus and exam pattern is the first step toward cracking ISRO VSSC 2025. Plan your study schedule, practice consistently, and focus on both theory and application.
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