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

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

Shivani PooniaUpdated on 25 Jul 2025, 10:29 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. Download link is given below. You can view the details from below:

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

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 $\mathrm{He}^{+}$?

[Bohr radius $=52.9$ picometers, mass of an electron $=9.11 \times 10^{-31} \mathrm{~kg}$, Planck's constant $=6.626 \times 10^{-34} \mathrm{Js}$ ]

(a) 2.4 femtoseconds

(b) 4.8 femtoseconds

(c) 24 femtoseconds

(d) 0.24 femtoseconds

2. Let $f: \mathbf{R} \rightarrow \mathbf{R}$ be the function given by $f(x)=\cos \left(\tan ^{-1} x\right)$. Which one of the following statements is TRUE?

(a) $\quad f$ is decreasing for $x>0$

(b) $\quad f$ is decreasing for $x<0$

(c) $\quad f$ is decreasing on $\mathbf{R}$

(d) $\quad f$ is decreasing on the interval $(-1,1)$

3. Which one of the following is the solution of the differential equation

$x^2 \frac{d y}{d x}+9 x y=x^4 \quad$ for $x>0$

given that $y=0$ when $x=1$ ?

(a) $12 y=x^3-\frac{1}{x^9}$

(b) $12 y=x^9-\frac{1}{x^3}$

(c) $9 y=x^{21}-\frac{1}{x^3}$

(d) $9 y=x^3-\frac{1}{x^{21}}$

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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: 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 marking scheme for the IISER 2025 exam?
A:

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

Q: How many questions are there in the IISER Aptitude Test (IAT) 2025?
A:

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

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Questions related to IISER Aptitude Test

On Question asked by student community

Have a question related to IISER Aptitude Test ?

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 closed, you won’t be able to change it. But don’t worry too much. Once the results are out and before the counselling starts (before 16 June), there is usually a document verification process. You may get a chance to upload the correct and updated certificate during that time.

Just make sure you get the 2025–2026 EWS certificate ready as soon as possible, so if they allow updates before counselling, you can upload the correct one.

Hope it helps !

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 application date.

  • Clearly mentions OBC-NCL and your caste is in the central list .

If these points are okay, then your form is fine.

Hope it helps !

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 who are prepared for it have an advantage.

To know the complete preparation strategies, you can visit our website by clicking on the link given below.

https://engineering.careers360.com/articles/how-should-preparation-strategies-differ-for-jee-main-and-jee-advanced

Thank you

Hope this information helps you.

Hello reader,

Last year that is 2023 around 9.5 lakh students attempted for jee mains round one, while 8.6 lakh students attempted for jee mains round two. Across both the sessions around 12 lakh students sat for the jee mains exam in year 2023.

Hey there,

Which exam are you talking about? Please provide the proper information in your question so that we can help you with your query.

Since I found your question in the Engineering section, I guess you are asking about the engineering exam (JEE Exam). Let me tell you about the JEE exam:

Through the JEE exam, you can access all the undergraduate courses in the engineering domain. You can get admission into engineering courses like B.Tech in Computer Science Engineering, B.Tech in Electronics and Communication, B.Tech in Electrical Engineering, B.Tech in Mechanical Engineering, B.Tech in Civil Engineering, and many more. This exam allows you to get admission into the top engineering colleges in India like IITs, NITs, GFTIs, etc.

I hope this information helps you. If you need more information about anything, please share your queries with us.