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ISRO VSSC TECHNICAL ASSISTANT COMPUTER SCIENCE SYLLABUS

📘 ISRO VSSC Technical Assistant (Computer Science) – Complete Syllabus 2025

Based on Official Previous Year Question Papers

The Indian Space Research Organisation (ISRO), through the Vikram Sarabhai Space Centre (VSSC), conducts recruitment for the post of Technical Assistant (Computer Science). Candidates preparing for this exam often face one major challenge — lack of a clear, officially published syllabus.

To bridge that gap, we have carefully analyzed two official VSSC question papers (Advt. No. 335 and Post No. 1546) to give you a complete, detailed, and exam-accurate syllabus.

🧠 Overview of the Exam Pattern

🔍 Subject-Wise Detailed Syllabus

1. Programming (C, C++, Java, Python)

This is one of the most heavily covered subjects. Expect both concept-based and code-based questions.

Topics Covered:

  • C, C++, and Java Syntax
  • Input/Output Functions (e.g., cout, printf)
  • Function types: Inline, Virtual, Recursive
  • Memory allocation, Arrays & Pointers
  • Object-Oriented Programming: Constructors, Polymorphism
  • Code output analysis
  • Operator Overloading (including limitations)
  • String manipulation and logic

2. Data Structures

Questions are frequently code-driven or based on memory/time complexity.

Topics Covered:

  • Arrays, Stacks, Queues (circular, priority)
  • Linked Lists (Singly/Doubly)
  • Trees: Binary Tree, BST, AVL Tree (rotations, traversals)
  • Graph Representations (Adjacency List/Matrix)
  • Heaps: Min/Max Heap, Heapify operations
  • Hash Tables: Hash functions, Linear Probing

3. Algorithms

A crucial subject where both logic and implementation are tested.

Topics Covered:

  • Sorting Algorithms: Bubble, Quick, Merge, Heap
  • Searching: Linear, Binary
  • Greedy Algorithms
  • Divide and Conquer Techniques
  • Time and Space Complexity Analysis
  • Dynamic Programming Concepts

4. Operating Systems

Expect conceptual, process-based, and scenario-based questions.

Topics Covered:

  • Process Scheduling: FCFS, SJF, Round Robin, Priority
  • Process Synchronization: Mutex, Semaphore
  • Deadlock Prevention, Avoidance
  • Paging and Page Replacement
  • Memory Management: Fragmentation, Segmentation
  • File Systems and Disk Scheduling
  • Thread pools and thread behavior

5. Database Management Systems (DBMS)

Most questions are SQL-based or related to transaction behavior.

Topics Covered:

  • SQL Queries: SELECT, JOIN (INNER, OUTER), GROUP BY
  • Integrity Constraints: Primary, Foreign Keys
  • B+ Trees and Indexing (clustered/unclustered)
  • Transactions: ACID Properties
  • Normal Forms (1NF to 3NF, BCNF)
  • Referential Integrity
  • Relational Algebra (basics)

6. Computer Networks

Both theoretical and applied networking knowledge is tested.

Topics Covered:

  • OSI & TCP/IP Models
  • IP Addressing: Classes, Subnetting
  • Protocols: TCP, UDP, FTP, DNS, DHCP
  • SSL Handshake & Secure Communication
  • Routing: Static, Dynamic, Interface Matching
  • Throughput & Bandwidth Calculations

7. Digital Logic & Computer Architecture

A strong focus on logical reasoning and bit-level calculations.

Topics Covered:

  • Number Systems: Binary, Octal, Decimal, Hexadecimal
  • Logic Gates: AND, OR, NOT, XOR, NAND
  • Boolean Algebra and Karnaugh Maps
  • Combinational Circuits: MUX, DEMUX
  • Sequential Circuits: Flip-Flops, Counters
  • Cache Memory: Direct, Set Associative, LRU
  • Instruction Formats and CPU Cycle Estimation

8. Software Engineering

Few but important questions from this area.

Topics Covered:

  • SDLC Models: Waterfall, Agile, Prototype
  • Testing Types: Alpha, Beta, Regression, White-box
  • Cyclomatic Complexity
  • Requirement Engineering
  • Module Coupling & Cohesion

9. Compiler Design & Automata Theory

Typically 2–3 logic-based questions.

Topics Covered:

  • FSMs: DFA, NFA, Mealy, Moore
  • Lexical Analysis & Tokens
  • Syntax Analysis and Regular Expressions
  • Backtracking and Parsing

10. Discrete Mathematics & Applied Mathematics

Expect numerical and logical reasoning types.

Topics Covered:

  • Sets, Relations, Functions
  • Matrices & Linear Algebra
  • Permutations and Combinations
  • Probability Theory
  • Graph Theory Basics (trees, spanning trees)

11. Cybersecurity

Some conceptual and scenario-based questions.

Topics Covered:

  • Symmetric & Asymmetric Encryption (RSA, Blowfish)
  • SSL/TLS Handshake
  • Firewalls & Secure Communication
  • Phishing and Network Threats
  • Hamming Code and CRC

12. Web Technologies & Miscellaneous

Usually 1–2 marks only.

Topics Covered:

  • HTTP Status Codes (403, 404, 500)
  • URL & FTP Operations
  • SMTP, TCP Connections
  • Real-life applications like ChatGPT, Bhashini

📊 Subject-Wise Approximate Weightage

Subject

Weightage (Approx. out of 80 Qs)

Programming

20–25 Qs

Data Structures & Algorithms

20–22 Qs

Operating Systems

10–12 Qs

DBMS

10–12 Qs

Networks

8–10 Qs

Architecture & Logic

8–10 Qs

Software Engg. & Compiler

4–6 Qs

Cybersecurity

3–5 Qs

Discrete Maths

3–4 Qs

📌 Final Tips for Aspirants

  • Focus on concept clarity + code output based questions.
  • Practice previous year questions to understand the framing.
  • Learn shortcuts for calculations in logic and matrix problems.
  • Revise SQL and core OS topics thoroughly — they’re high scoring.
  • Use standard textbooks like:
    • Let Us C by Yashwant Kanetkar
    • Data Structures by Narasimha Karumanchi
    • Operating System Concepts by Galvin
    • Database Systems by Elmasri & Navathe

🧾 Conclusion

The ISRO VSSC Technical Assistant (Computer Science) exam tests depth of understanding, logical application, and real coding knowledge. With this detailed syllabus built from actual questions, you can now streamline your preparation with full confidence.

Prepare well, stay consistent, and reach for the stars — literally!

 


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