NSO Answer Key 2025-26 Out - Download SOF NSO Set A, B, C PDF for Class 1 to 12
The Science Olympiad Foundation (SOF) released the SOF NSO answer key for Set A, Set B and Set C on December 16, 2025, December 27, 2025 and January 2, 2026, respectively. The Science Olympiad Foundation conducted Sets A, B, and C exams on November 13, November 27, and December 11, 2025, respectively. The NSO answer key 2025-26 for all sets is released online on the official website, sofworld.org.
Students should know that NSO Set A, B, and C answer keys are released separately. Using the answer key of NSO, students can compute their estimated marks in the SOF NSO exam. Last year, SOF published the NSO answer key on December 4, 19, and 24, 2024, for Sets A, B and C, respectively. Read the article for more information and to download the SOF NSO 2025–26 answer key.
Also, know about the SOF Olympiad results date
NSO Answer Key 2025-26 PDF Download
We have provided the NSO 2025-26 answer key links below. The Set A, Set B and Set C answer keys are available below. Using NSO answer keys for Classes 1–12, students can calculate their probable marks and compare them with NSO Cutoff 2025-26 to know the chances of selection.
| Particulars | Answer Key Link |
|---|---|
| NSO Set A Answer Key | Download Here |
| NSO Set B Answer Key | Download Here |
| NSO Set C Answer Key | Download Here |
Important Dates of NSO Answer Key 2025-26
The National Science Olympiad (NSO) is an annual scholarship test designed to develop scientific reasoning and logical abilities in school students. It is conducted at two levels. Students must note NSO 2025-26 answer key dates to make sure they do not miss any essential events. Check the SOF NSO answer key 2025-26 dates for levels 1 & 2 below.
| Events | Dates |
|---|---|
| NSO 2025-26 Exam (Level 1) Set A | November 13, 2025 |
| NSO 2025-26 Exam Level 1 (Set B) | November 27, 2025 |
| NSO 2025-26 Exam (Level 1) Set C | December 11, 2025 |
| NSO 2025-26 Answer Key for Level 1 (Set A) | December 16, 2025 |
| NSO 2025-26 Answer Key for Level 1 (Set B) | December 27, 2026 |
| NSO 2025-26 Answer Key for Level 1 (Set C) | January 2, 2026 |
| NSO cut-off 2025-26 | January 10, 2026 |
| NSO 2025-26 Result Date for Level 1 | January 12, 2026 |
| NSO Answer Key 2025-26 for Level 2 | March 2026 |
| NSO Result Date for Level 2 | March 2026 |
NSO Level 2 Exam Dates
| Category | Exam Date | Regions / Mode |
|---|---|---|
| Domestic | February 8, 2026 | All regions except Maharashtra |
| Domestic | February 15, 2026 | Maharashtra only |
| International | February 9 to February 20, 2026 | Hybrid mode |
How to Download NSO Answer Key 2025-26?
Students can read and download the NSO 2025-26 answer key by following the instructions outlined below.
- Click on the link given in the table above.
- Your screen will display the NSO answer key for 2025–26.
- Now, press the download button.
- The answer key will be downloaded in PDF format.
- Start carefully examining the answers and calculate your scores using the SOF NSO 2025-26 answer key.
Also, check -
NSO Results 2025–26
SOF releases the NSO 2025–26 results online through the official website. The National Science Olympiad result is also sent to the individual schools by the Science Olympiad Foundation (SOF). Each participating student receives a participation certificate as well as a Student Performance Report (SPR). SPR includes a full review of exam performance in several parts. Gold, Silver, and Bronze medals are awarded to class toppers. The results will also be made accessible online.
How to Calculate Scores with the NSO Answer Key 2025-26?
To compute results using the NSO 2025-26 answer key, students must follow the marking scheme provided.
- Add relevant marks for each correct answer.
- There will be no negative deduction.
NSO Class 1 to 4 Marking Scheme
| Section | No. of Questions | Marks per Question | Total Marks |
|---|---|---|---|
| Logical Reasoning | 5 | 1 | 5 |
| Science | 25 | 1 | 25 |
| Achievers Section | 5 | 2 | 10 |
| Grand Total | 35 | 40 |
NSO Class 5 to 10 Marking Scheme
| Section | No. of Questions | Marks per Question | Total Marks |
|---|---|---|---|
| Logical Reasoning | 10 | 1 | 10 |
| Science | 35 | 1 | 35 |
| Achievers Section | 5 | 3 | 15 |
| Grand Total | 50 | 60 |
NSO Class 11 to 12 Marking Scheme
| Section | No. of Questions | Marks per Question | Total Marks |
|---|---|---|---|
| Physics & Chemistry | 25 | 1 | 25 |
| Achievers Section | 5 | 3 | 15 |
| Mathematics/Biology | 20 | 1 | 20 |
| Grand Total | 50 | 60 |
The previous years' NSO answer keys are provided below.
NSO Answer Key 2024-25
| Particulars | Answer Key Link |
|---|---|
| NSO Set A Answer Key | Download Here |
| NSO Set B Answer Key | Download Here |
| NSO Set C Answer Key | Download Here |
NSO Answer Key 2023-24
| Particulars | Answer Key Link |
|---|---|
| NSO Set A Answer Key | Download here |
| NSO Set B Answer Key | Download here |
| NSO Set C Answer Key | Download here |
NSO Answer Key 2023 (Official) - Download Here
| Class | NSO Set A Answer Key | NSO Set B Answer Key | NSO Set c Answer Key |
|---|---|---|---|
| Class 1 | Download here | Download here | Download here |
| Class 2 | Download here | Download here | Download here |
| Class 3 | Download here | Download here | Download here |
| Class 4 | Download here | Download here | Download here |
| Class 5 | Download here | Download here | Download here |
| Class 6 | Download here | Download here | Download here |
| Class 7 | Download here | Download here | Download here |
| Class 8 | Download here | Download here | Download here |
| Class 9 | Download here | Download here | Download here |
| Class 10 | Download here | Download here | Download here |
| Class 11 | Download here | Download here | Download here |
| Class 12 | Download here | Download here | Download here |
Frequently Asked Questions (FAQs)
Q: Is there any negative marking in the NSO exam 2025-26?
A:
No, the National Science Olympiad does not have negative marking.
Q: Will the NSO answer key 2025-26 be released on different dates for different classes?
A:
The NSO 2025–26 answer key is released on different dates for different sets. The SOF answer key will be released online.
Q: Can I challenge the NSO 2025 answer key?
A:
There is no way to provide feedback or challenge the official answer key.
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Questions related to NSO
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Have a question related to NSO ?
Hello Rehan
- To download the admit card of IPE,NSO,IMO,SFO you should visit the official site of sof world
- Then you can choose the specific exam and level
- Enter your roll no. And security code
- You can download your admit card.
https://school.careers360.com/articles/sof-admit-card
You can visit this site for more details
I
You can check your NSO results online through the official Science Olympiad foundation (SOF), the level 1 results for the 2025-26 exams are expected to be announced in January 2026.
Hello,
For NSO level 2 students qualify via top perfomance in Level 1. I have attached the link for NSO results 2025 - 2026 in which you can get the results by entering your school code and roll number. Kindly check the below link and get your results.
https://school.careers360.com/articles/nso-result
I
The nso answer key for class 9 set b is a critical resource for students to calculate their expected scores and analyze their performance in the national science olympiad. the answer key provides the correct options for all fifty questions, which are divided into three sections: logical reasoning, science, and
Hello,
The link to the answer key is attached herewith. You can find the answer key on the website of Careers360. It will help you analyse your in-depth performance.
https://school.careers360.com/articles/nso-answer-key
Thank you.
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