International Olympiad of Science (iOS) 2025–26 by Silverzone
The International Olympiad of Science (iOS) 2025–26, organized by the SilverZone Foundation, is a prestigious annual competition aimed at evaluating and enhancing students' scientific knowledge and reasoning abilities. Open to students from Class 1 to 12, the Olympiad provides a platform to benchmark their understanding against national and international peers.
Exam Schedule & Registration
Exam Dates: November 18 and December 10, 2025 (schools select one date)
Registration Deadline: August 30, 2025
Mode: Offline (pen-and-paper)
Medium: English
Duration: 60 minutes
Application Fee: ₹125 (plus ₹20 school service charge)
Registration: Through schools only; individual registrations are not accepted.
Exam Structure
The iOS is conducted in three levels:
Level 1: Open to all students from Class 1 to 12.
Level 2: Top 1000 rank holders (Ranks 4–1003) with a minimum of 50% marks.
Level 3: 1st rank holders from Level 2 in Classes 6 to 12; conducted in New Delhi. The iOS is conducted in three levels:
Opening Date: 29-Jan-2026 02:19 AM
Closing Date: 29-Jan-2026 02:19 AM
Syllabus
Class 1:
Living and Non-Living Things
Plants and Animals
Our Food and Clothes
Our Environment
Family and Neighbourhood
Human Body
Reasoning and Aptitude
Scholar’s Zone
Class 5:
Matter
Environment and Natural Calamities
Plants and Animals
Light and Sound
Our Body and Nutrition
Work and Energy
Reasoning and Aptitude
Scholar’s Zone
Class 9:
Matter and Its Composition
Motion and Force
Work and Energy
The Human Body
Environment and Natural Resources
Reasoning and Aptitude
Scholar’s Zone
Guidelines
- All questions are mandatory and there is no negative marking.
- Duration: minutes
- Total Questions:
- Question Type: MCQ
Disclaimer
- Read the question carefully.
- Select the best answer from the provided options.
- Ensure you have a stable Internet connection.
- After selecting your answer, click on the "Submit" button.