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    IISER 2025 Question Paper with Solutions - Download PDF & Answer Key

    IISER 2025 Question Paper with Solutions - Download PDF & Answer Key

    Shivani PooniaUpdated on 06 Mar 2026, 11:43 AM IST

    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.

    This Story also Contains

    1. Download IISER Question Paper with Solutions eBook
    2. IISER Aptitude Test Question Paper 2025
    3. IISER IAT Sample Paper
    4. IISER Previous Year Paper
    IISER 2025 Question Paper with Solutions - Download PDF & Answer Key
    IISER 2025 Question Paper with Solutions

    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.

    Download IISER Question Paper with Solutions eBook

    Click the link below to download the IISER eBook for free.


    IISER Aptitude Test Question Paper 2025

    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−1⁡x). 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

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    IISER IAT Sample Paper

    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

    IISER Biology Sample Paper 1

    Model IISER paper 2

    IISER Biology Sampler Paper 2

    Model IISER paper 2 (Hindi)

    IISER Biology Hindi Sampler Paper 2

    IISER Previous Year Paper

    In this section we will dive into a detailed question paper of each year.

    Frequently Asked Questions (FAQs)

    Q: How many questions are there in the IISER Aptitude Test (IAT) 2026?
    A:

    The exam consists of 60 questions in total, with 15 questions each from Physics, Chemistry, Mathematics, and Biology.

    Q: What is the marking scheme for the IISER 2026 exam?
    A:

    Each correct answer awards 3 marks, while 1 mark is deducted for every incorrect response.

    Q: Where can I find official IISER sample papers and mock tests?
    A:

    Official IISER sample papers and mock tests are available on the IISER admission website at iiseradmission.in, which is also linked on this page.

    Q: What is the date for IAT 2026 exam?
    A:

    The IISER IAT 2026 exam will be conducted on 7 June 2026.

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    Questions related to IISER Aptitude Test

    On Question asked by student community

    Have a question related to IISER Aptitude Test ?

    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.

    Link: IISER Syllabus and Pattern
    IISER Preparation Tips

    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

    Hello aspirant,

    Applicants must take either the JEE Main or JEE Advanced exam in order to be considered for admission to the best engineering institutes in India. JEE Advanced and Main are administered by separate bodies. Because the JEE Advanced exam is more difficult than the JEE Main exam, candidates