SOF NSO Answer Key 2025-26 for Class 1 to 12, Download PDF (Set A, B, C)

SOF NSO Answer Key 2025-26 for Class 1 to 12, Download PDF (Set A, B, C)

Dinesh GoyalUpdated on 17 Dec 2025, 03:00 PM IST

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

  1. Important Dates of NSO Answer Key 2025-26
  2. How to Download NSO Answer Key 2025-26?
  3. How to Calculate Scores with the NSO Answer Key 2025-26?
SOF NSO Answer Key 2025-26 for Class 1 to 12, Download PDF (Set A, B, C)
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.

EventsDates
NSO 2025-26 Exam (Level 1) Set ANovember 13, 2025
NSO 2025-26 Exam Level 1 (Set B)November 27, 2025
NSO 2025-26 Exam (Level 1) Set CDecember 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 1January 2026
NSO 2025-26 Exam Date for Level 2February 2026
NSO Answer Key 2025-26 for Level 2March 2026
NSO Result Date for Level 2March 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

ParticularsAnswer Key Link
NSO Set A Answer KeyDownload Here
NSO Set B Answer KeyDownload Here
NSO Set C Answer KeyDownload 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.

  1. Click on the link given in the table above.
  2. Your screen will display the NSO answer key for 2025–26.
  3. Now, press the download button.
  4. The answer key will be downloaded in PDF format.
  5. 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 Reasoning515
Science25125
Achievers Section5210
Grand Total35
40

NSO Class 5 to 10 Marking Scheme

Section
No. of Questions
Marks per QuestionTotal Marks
Logical Reasoning10110
Science35135
Achievers Section5315
Grand Total50
60

NSO Class 11 to 12 Marking Scheme

Section
No. of Questions
Marks per QuestionTotal Marks
Physics & Chemistry25125
Achievers Section5315
Mathematics/Biology20120
Grand Total50
60

The previous years' NSO answer keys are provided below.

NSO Answer Key 2024-25

ParticularsAnswer Key Link
NSO Set A Answer KeyDownload Here
NSO Set B Answer KeyDownload Here
NSO Set C Answer KeyDownload Here

NSO Answer Key 2023-24

ParticularsAnswer Key Link
NSO Set A Answer KeyDownload here
NSO Set B Answer KeyDownload here
NSO Set C Answer KeyDownload here

NSO Answer Key 2023 (Official) - 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.