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IISER 2025 Question Paper with Solutions - The IAT exam finally got over yesterday. Our experts have given all the required information on this page, as the exam is over now. The IISER exam 2025 question paper with detailed solutions is an important resource for aspiring candidates preparing for the Indian Institutes of Science Education and Research (IISER) Aptitude Test. By reviewing the official question paper provided below, students can evaluate their performance. Not only that, but students who have their exam next year can practice and get a clear idea about the exam pattern and refine their preparation strategy for future attempts. The official question paper is out. The download link is provided below in this article.
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The IISER IAT 2026 registration has started on 5 March 2026, and the application window will remain open till 13 April. The IISER 2026 Exam is scheduled to take place on 7 June 2026.
Click the link below to download the IISER eBook for free.
The IISER aptitude test question paper is now updated in this section. You can also download the Official question paper from the link given below.
The exam was comparatively tougher than last year. Chemistry and Biology was easy to moderate, Maths was moderate whereas Physics was moderate to difficult. All in all 18% of the paper was easy, 64% was moderate and the other 18% was tough.
Some questions are:
1. What is the time period of revolution of an electron in the fourth Bohr orbit of He+?
[Bohr radius =52.9 picometers, mass of an electron =9.11×10−31 kg, Planck's constant =6.626×10−34Js ]
(a) 2.4 femtoseconds
(b) 4.8 femtoseconds
(c) 24 femtoseconds
(d) 0.24 femtoseconds
2. Let f:R→R be the function given by f(x)=cos(tan−1x). Which one of the following statements is TRUE?
(a) f is decreasing for x>0
(b) f is decreasing for x<0
(c) f is decreasing on R
(d) f is decreasing on the interval (−1,1)
3. Which one of the following is the solution of the differential equation
x2dydx+9xy=x4 for x>0
given that y=0 when x=1 ?
(a) 12y=x3−1x9
(b) 12y=x9−1x3
(c) 9y=x21−1x3
(d) 9y=x3−1x21
Related links:
Students must also practice the IISER IAT mock test, available on the official website, after completing the IISER syllabus to test their preparation.
Particulars | Details |
Model IISER paper 1 | |
Model IISER paper 2 | |
Model IISER paper 2 (Hindi) |
In this section we will dive into a detailed question paper of each year.
Year | Download IISER papers |
2024 | |
2023 | |
2022 | |
2021 | |
2019 | |
2018 | |
2017 |
Frequently Asked Questions (FAQs)
The exam consists of 60 questions in total, with 15 questions each from Physics, Chemistry, Mathematics, and Biology.
Each correct answer awards 3 marks, while 1 mark is deducted for every incorrect response.
Official IISER sample papers and mock tests are available on the IISER admission website at iiseradmission.in, which is also linked on this page.
The IISER IAT 2026 exam will be conducted on 7 June 2026.
On Question asked by student community
Hi! To prepare for the IISER Aptitude Test, you need to understand the syllabus, exam pattern, and follow a proper preparation strategy. Click on the links below to learn more.
You can find IISER Aptitude Test (IAT) previous year question papers and answer keys on educational websites like Careers 360. They provide with the official question papers as well as the answer key.
Read more at
https://engineering.careers360.com/articles/iiser-2025-question-paper-solutions
Hello,
If you have uploaded the old EWS certificate (2024–2025) instead of the new one (2025–2026), there is a chance that it may not be accepted, as the IISER notification clearly asks for the valid and updated EWS certificate for the year 2025–2026.
Right now, if the correction window is
Hello,
If you have selected OBC-NCL category and uploaded a Central OBC-NCL certificate , then there is no issue .
IISER accepts Central OBC-NCL certificate , as long as it is valid and issued by a competent authority. Just make sure the certificate is:
Issued within one year from the
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