https://school.careers360.com/articles/nso-sample-papers
Use these to practice and get familiar with the NSO exam pattern and difficulty.
Hope you understand.
SOF NSO Answer Key 2025-26 for Class 1 to 12, Download PDF (Set A, B, C)
Upcoming Event
NSO Exam Date:27 Nov' 25 - 27 Nov' 25
NSO Answer Key 2025-26 - The Science Olympiad Foundation (SOF) will release the NSO Set A, Set B, and Set C answer keys separately in December 2025. The unofficial NSO answer keys will also be provided by coaching institutes on their respective websites. NSO answer key 2025-26 for all sets will be released online on the official website, sofworld.org.
The National Science Olympiad (NSO) exam starts today, on November 13, and continues further on November 27 and December 11, 2025. 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.
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?
Also, know about: 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 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
| 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
| 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
| 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
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Have a question related to NSO ?
Hello,
29 out of 40 score generally consider very good score if exams difficulty was moderate to high and it show strong conceptual understanding and accuracy although your ranking depends on overall performance of nation wide and your level of class
From this score you can get decent rank and percentile
I hope you find this helpful!!!
Thank you
Hi dear candidate,
You can try again downloading the answer key for Science Olympiad Foundation NSO question papers from class 1st to 12th of set A,B and C on our official website with the link attached below:
SOF NSO Answer Key 2025-26 for Class 1 to 12, Download PDF (Set A, B, C)
BEST REGARDS
Hii,
U can download ur NSO 2025-26 question papers from this link NSO sample papers 2025-26
Hope this information might be useful for u. Good luck.
Hello,
You can access sample papers and previous years question papers for the National Science Olympiad (NSO) from given link:
HELLO,
Don't worry if you have lost your NSO admit card , then you can easily download a duplicate from the official SOF website
- You need to visit the official website of SOF
- Then there you will find an link to download Admit card under the section Download menu or student zone
- There you have to choose NSO and the relevant level
- There fill your details like School code , class and roll number exactly as provided by school
- After that submit the details and your admit card will appear on the screen
In case you don't have your roll number or face any issues while downloading the admit card then contact your school coordinator or contact SOF the through the official mail to request assistance
Hope this Helps!
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