ISRO ISTRAC Previous Year Question Papers 2026: Technician-B and Technical Assistant & Other Posts

Candidates preparing for the ISRO ISTRAC Recruitment 2026 (Advertisement No. ISTRAC:02:2026) are actively searching for ISRO ISTRAC previous year question papers, ISRO Technician-B previous year question paper PDFs, and ISRO Technical Assistant previous year papers with solutions to enhance their exam preparation. Although ISRO ISTRAC is conducting the recruitment, the written examination follows a similar pattern used by other ISRO centres for the same posts. Therefore, previous year question papers from ISRO recruitments for Technician-B, Technical Assistant, Scientific Assistant, and other equivalent posts are highly useful for practice.

In this article, you’ll find ISRO ISTRAC previous year question papers, learn how to use them effectively, and understand what to expect in the ISRO ISTRAC 2026 Written Test/Computer-Based Test (CBT).

ISRO ISTRAC Recruitment 2026 Overview – Details Here!

Important Dates for ISRO ISTRAC Recruitment 2026

ISRO ISTRAC Technician-B Previous Year Question Paper: What to Expect

For the Technician-B posts notified under ISTRAC 2026 (ITI Electronics Mechanic and ITI Carpenter), previous year Technician-B papers conducted by other ISRO centres for the same trades are the best available practice resource. Based on the consistent exam pattern followed across ISRO centres, here is what the paper structure typically looks like:

• Total Questions: 80 MCQs
• Duration: 1.5 hours
• Marking Scheme: +1 for correct answer, -0.33 for wrong answer
• Question Distribution (based on pattern followed in past Technician-B exams across ISRO centres): trade-specific technical questions forming the bulk of the paper, along with a smaller portion covering general awareness, basic arithmetic/reasoning, and general engineering concepts relevant to the trade.

For ITI Electronics Mechanic candidates, old Technician-B papers (conducted by centres like VSSC, SAC, and LPSC for Electronics Mechanic and related electronics trades) have focused heavily on basic electronics components, semiconductor devices, analog and digital circuit fundamentals, electronic measuring instruments, and consumer electronics repair concepts, consistent with the NCVT trade curriculum.

For ITI Carpenter candidates, previous ISRO Technician-B carpenter-trade papers (where available from other centres) have focused on woodworking tools, joinery techniques, timber properties, and trade safety practices.

How to Use ISRO ISTRAC 2026 Technician-B Previous Papers Effectively

• Solve full-length previous year papers within the 1.5-hour exam duration to improve speed and time management.
• Review your mistakes after each paper, especially incorrect answers caused by guesswork, as the CBT includes negative marking.
• Verify answers using your NCVT or prescribed trade curriculum textbooks instead of relying solely on unofficial answer keys.
• Give extra attention to topics that appear repeatedly across previous year papers, as ISRO frequently tests core trade concepts.

ISRO ISTRAC Technical Assistant Previous Year Question Paper: What to Expect

For the Technical Assistant posts under ISRO ISTRAC :2026 (Electronics and Mechanical streams), previous year Technical Assistant papers conducted by other ISRO centres (such as SAC, LPSC, URSC, and VSSC) for the same streams are the closest available reference material, since the diploma-level qualification requirement and exam pattern are identical.

• Total Questions: 80 MCQs
• Duration: 1.5 hours
• Marking Scheme: +1 for correct answer, -0.33 for wrong answer
• Skill Test: Conducted separately for 100 marks (qualifying nature)

For Technical Assistant (Electronics), previous papers across ISRO centres have typically emphasized diploma-level topics such as basic electrical and electronics engineering, analog and digital electronics, communication engineering fundamentals, electronic instrumentation, microcontrollers, and control systems, reflecting the First Class Diploma in Electronics requirement.

For Technical Assistant (Mechanical), previous papers have generally covered engineering mechanics, strength of materials, thermodynamics, fluid mechanics, manufacturing processes, and machine design fundamentals, in line with the Diploma in Mechanical Engineering curriculum.

How to Use ISRO ISTRAC Technical Assistant 2026 Previous Papers Effectively

• Practice previous year papers according to your discipline, such as Electronics or Mechanical, instead of mixing different trades, as ISRO conducts separate examinations for each stream.
• Focus on numerical and calculation-based questions, especially for Technical Assistant posts, as they frequently appear in the written examination. Solve these questions under timed conditions to improve speed and accuracy.
• Use previous papers to strengthen your fundamentals, as a solid understanding of core concepts will also help you perform well in the qualifying Skill Test.
• Analyze your mistakes after each practice session to identify weak areas and improve your performance in subsequent mock tests and previous papers.
• Attempt full-length papers within the actual exam duration to develop effective time management skills and build confidence before the CBT.