SOF NSO Answer Key 2025-26 for Class 1 to 12, Download PDF (Set A, B, C)
NSO Answer Key 2025-26 - The Science Olympiad Foundation (SOF) released the SOF NSO answer key for Set A on December 16, 2025. The Set B and Set C answer keys will be released in December 2025. The 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.
This Story also Contains
- Important Dates of NSO Answer Key 2025-26
- How to Download NSO Answer Key 2025-26?
- How to Calculate Scores with the NSO Answer Key 2025-26?
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
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 2025 |
| NSO 2025-26 Answer Key for Level 1 (Set C) | December 2025 |
| NSO 2025-26 Result Date for Level 1 | January 2026 |
| NSO 2025-26 Exam Date for Level 2 | February 2026 |
| NSO Answer Key 2025-26 for Level 2 | March 2026 |
| NSO Result Date for Level 2 | March 2026 |
NSO Answer Key 2025-26 PDF Download
We will also provide the latest NSO 2025-26 answer key links once they are available. 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.
NSO Answer Key 2025-26
| 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 |
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 |
| Class10 | Download here | Download here | Download here |
| Class11 | Download here | Download here | Download here |
| Class12 | 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
On Question asked by student community
Have a question related to NSO ?
Hello,
The National Science Olympiad is conducted by the Science Olympiad Foundation for the students from classes 9-12.
The aim of the examination is inculcate a passion for science in the students. The duration of examination is 1 hour.
Check out the official website of Careers360 for the answer keys of all sets. Link below.
https://school.careers360.com/articles/nso-answer-key
Thank you.
Hello,
Here is your SOF NSO Answer Key 2025-26. Kindly open open the link and check it out.
https://school.careers360.com/articles/nso-answer-key
I hope it will help you. For any further query please let me know.
Thank you.
Hello,
Here is your NSO set A class 7th answer key 2025 26. I am providing you the link kindly open and check it out.
https://school.careers360.com/articles/nso-answer-key
I hope it will help you . For any further query please let me know.
Thank you.
Hello,
Here is the link for your 9th standard NSO Science set C solved Question paper for 2025. Kindly check the following link.
https://www.careers360.com/question-nso-9th-2025-26-set-c-answer-key
I hope this helps you.
Hello
To download the NSO 2025–26 answer key, you just need to visit the official SOF website.
There, you will find a section called “Answer Keys 2025–26” where NSO keys for each class and set are uploaded.
Select your class and question set, and the answer key will open as a PDF. You can then save it directly to your phone or laptop.
If it’s not uploaded yet, don’t worry, SOF usually releases it a few weeks after the exam.
You can CLICK HERE for more details.
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