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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:

Important Dates

Opening Date: 24-Apr-2025 07:41 AM

Closing Date: 24-Apr-2025 07:41 AM

Q1: What is the International Olympiad of Science (iOS)?

A1: The iOS is an annual science competition conducted by the SilverZone Foundation. It aims to assess students' scientific knowledge and reasoning abilities, providing a platform to benchmark their understanding against national and international peers.

Q2: Who is eligible to participate?

A2: Students from Class 1 to 12 across all educational boards (CBSE, ICSE, State Boards) are eligible to participate in the iOS.

Q3: How can I register for the iOS?

A3: Registration is done through schools only. Interested students should contact their school's examination coordinator. Individual registrations are not accepted.

Q4: Is there any negative marking?

A4: No, there is no negative marking in the iOS exam.

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.

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