IAT (IISER) Chapter Wise PYQs

Practise IAT (IISER) previous year questions organised chapter-wise across Biology, Chemistry, Mathematics, and Physics, covering 10 papers from 2017 to 2026. Each chapter shows a year-on-year question count so you can see which topics carry more weightage and where the syllabus has changed. Pick a chapter to start practising questions from that topic alone, pulled from every paper it has appeared in.

Biology

Chemistry

Mathematics

Physics

Frequently Asked Questions

1.What does the year-wise question count (e.g., "2026: 9 Qs | 2025: 15 Qs") mean?

It shows how many questions were asked from that chapter in each year's papers, so you can quickly spot chapters with consistently high weightage as well as ones where the number of questions has changed over time.

2.Are chapters the same across Biology, Chemistry, Mathematics, and Physics?

No, each subject has its own distinct set of chapters, listed under its own heading. Use the Biology, Chemistry, Mathematics, and Physics tabs at the top to jump to a subject.

3.Can I see chapter-wise trends going further back than 2025–26?

Yes, the PYQs span 2017 to 2026; the year-wise numbers shown alongside each chapter reflect the two most recent years, while the full historical range is available once you open the chapter.

4.What is the IAT (IISER) Biology chapter-wise difficulty breakdown?

Across the 33 chapters with analysis data, IAT (IISER) Biology has 150 questions in the previous year papers analysed: 43% easy, 54% moderate and 3% tough.

5.Which Biology chapters carry the most weightage in IAT (IISER)?

Based on the previous year papers analysed, these Biology chapters have been asked the most:

  • Principles of Inheritance and Variation - 14 questions (9%)
  • Biotechnology - Principles and Processes - 11 questions (7%)
  • Molecular Basis of Inheritance - 11 questions (7%)
  • Biotechnology - Principles and Processes has produced the most tough questions (2).
6.What is the IAT (IISER) Chemistry chapter-wise difficulty breakdown?

Across the 27 chapters with analysis data, IAT (IISER) Chemistry has 149 questions in the previous year papers analysed: 22% easy, 72% moderate and 6% tough.

7.Which Chemistry chapters carry the most weightage in IAT (IISER)?

Based on the previous year papers analysed, these Chemistry chapters have been asked the most:

  • Coordination Compounds - 17 questions (11%)
  • Chemical Bonding and Molecular Structure - 15 questions (10%)
  • Aldehydes and Ketones - 10 questions (7%)
  • Coordination Compounds has produced the most tough questions (2).
8.What is the IAT (IISER) Mathematics chapter-wise difficulty breakdown?

Across the 27 chapters with analysis data, IAT (IISER) Mathematics has 148 questions in the previous year papers analysed: 10% easy, 74% moderate and 16% tough.

9.Which Mathematics chapters carry the most weightage in IAT (IISER)?

Based on the previous year papers analysed, these Mathematics chapters have been asked the most:

  • Definite Integration - 15 questions (10%)
  • Matrices - 11 questions (7%)
  • Functions - 10 questions (7%)
  • Complex Number has produced the most tough questions (3).
10.What is the IAT (IISER) Physics chapter-wise difficulty breakdown?

Across the 28 chapters with analysis data, IAT (IISER) Physics has 150 questions in the previous year papers analysed: 8% easy, 74% moderate and 18% tough.

11.Which Physics chapters carry the most weightage in IAT (IISER)?

Based on the previous year papers analysed, these Physics chapters have been asked the most:

  • Electrostatics - 15 questions (10%)
  • Oscillations - 9 questions (6%)
  • Current Electricity - 8 questions (5%)
  • Laws of Motion has produced the most tough questions (5).