The Indian National Olympiad 2026 was the stage of India’s Science Olympiad program. This program is really important for science students in India. The Homi Bhabha Centre for Science Education, which is part of TIFR, organised the Indian National Olympiad 2026 for science subjects. These subjects included Astronomy, Chemistry, Physics, Biology and Junior Science. The INO 2026 took place on January 31 and February 1, 2026.
After the exams of the Indian National Olympiad, the Homi Bhabha Centre for Science Education releases the official answers a few days later, at the start of February, after the test dates. The Indian National Olympiad gives us a chance to look at the answers and send in our comments before they make the answers final and announce the results.
INO 2026 Answer Keys (All Subjects)
The INO question papers and answers for Astronomy and other science subjects like Chemistry, Physics, Biology and Junior Science were put on the HBCSE website after the exams. These answers help the students who took the Indian National Olympiad check their answers and guess what score they will get before the results are out, for the Indian National Olympiad.
You can get to these things by:
- Visiting the official HBCSE Olympiad portal.
- Navigating to the “Science Olympiad / INO 2026” section.
- Downloading the question papers and provisional solutions PDFs.
- These study materials are official. They were released by HBCSE.
Note: The real answer keys from HBCSE are carefully controlled. This means that any other versions you see outside of the HBCSE site are not valid. You should only trust the answer keys that are on the official HBCSE site.
Tentative Dates for INO Solutions, Comments, Results
The Indian National Olympiad exam has a lot of steps. Here are the typical timelines that the Homi Bhabha Centre for Science Education follows for the Indian National Olympiad exam cycle
| Event | Tentative Date |
| INO Registration Start | 6 January, 2026 |
| INO Registration Last Date | 17 January, 2026 |
| Admit Card Release | 23 January, 2026 |
| INAO Exam | 31 January, 2026 (9 AM to 12 PM) |
| INChO Exam | 31 January, 2026 (1:30 PM to 4:30 PM) |
| INJSO Exam | 1 February, 2026 (9 AM to 12 PM) |
| INPhO Exam | 1 February, 2026 (9 AM to 12 PM) |
| INBO Exam | 1 February, 2026 (1:30 PM to 3:30 PM) |
| Answer Key Release | 3 to 8 February, 2026 |
| Final Result Declaration | 6 March, 2026 |
How to Use the INO Answer Key
- Compare your responses against the official answers provided by HBCSE.
- Try to figure out what score you might get before they tell you the result. You can estimate your score to get an idea of how you did. Estimate your score before the official result is announced.
- You have to look carefully for any mistakes. The thing is, HBCSE allows students to submit comments on answers when the comment window is open. This means students can tell HBCSE what they think about the answers during this time.
Subject-wise INO Answer Keys
Physics (INPhO) Answer Key 2026
Students who appeared for the Indian National Physics Olympiad can download both the English and Hindi question papers along with comprehensive solutions. The INPhO examination was held on Sunday, February 1, 2026, from 9:00 AM to 12:00 noon.
Chemistry (INChO) Answer Key 2026
The Indian National Chemistry Olympiad answer key is now live on the official HBCSE portal. The exam was conducted on Saturday, January 31, 2026, in the afternoon session from 1:30 PM to 4:30 PM.
Biology (INBO) Answer Key 2026
Biology olympiad participants can access their answer key and proposed solutions. The INBO examination took place on Sunday, February 1, 2026, from 1:30 PM to 3:30 PM.
Astronomy (INAO) Answer Key 2026
The Indian National Astronomy Olympiad answer key has been published with detailed solutions. This exam was held on Saturday, January 31, 2026, from 9:00 AM to 12:00 noon.
Why Official HBCSE Keys Matter
Official answer keys from HBCSE are important because:
- Students can figure out their scores before the results are out. The students have an idea of what their scores will be before they get the results. Students are able to estimate their scores before they find out the results.
- Students have a chance to say something is not right or to make a comment if a solution does not seem correct. They can raise comments or objections about the solution if it appears incorrect.
- These keys are really important because they decide who gets to go to the stage, which is the Orientation-cum-Selection Camps or OCSCs for short.
FAQs
Q1. Has the official INO 2026 answer key been released?
Yes. The official INO 2026 answer keys and solutions have been released by HBCSE (TIFR) for all subjects after the completion of the exams.
Q2. Which subjects in INO 2026 answer keys are available?
The official INO 2026 answer keys are available for all Science Olympiad subjects, including INAO (Astronomy), INChO (Chemistry), INPhO (Physics), INBO (Biology), and INJSO (Junior Science).
Q3. Where can I download the official INO 2026 answer key PDFs?
Students can download the official INO 2026 answer key PDFs only from the HBCSE Olympiad official website, where subject-wise question papers and solutions are published.
