International Olympiad of Science 2025: The SilverZone Foundation is the organising authority of the International Olympiad of Science. Students from classes 1st to 12th can take part in the annual IOS.
The motive is to develop interest among the students in science concepts. SilveZone Foundation provides a detailed performance report of candidates participating in the International Olympiad of Science.
They can check the performance report to know the correct answers attempted in IOS. It can help them to know the logic behind the wrong answers. Adopting such habits can help students improve in future.
Check: International Chemistry Quiz 2025
International Olympiad Of Science 2025 Overview
Many students get excited discussing Science concepts. International Olympiad of Science is a gateway for students to learn and grow, knowing about Science topics.
Candidates get multiple-choice questions in the olympiad. It is to test the problem-solving skills in attempting questions asked in the olympiad.
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International Olympiad Of Science 2025 Overview
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Exam Conducting Authority
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SilverZone Foundation
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Name of Exam
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International Olympiad of Science (IOS)
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Eligibility
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Classes 1st to 12th
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Exam Frequency
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Annual
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Mode of Exam
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Online
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Medium
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English
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Questions Type
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MCQ (Multiple Choice Questions)
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Time
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40 minutes
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Negative Marking
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No Negative Marking
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Online Website Link
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https://www.silverzone.org/
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IOS Important Dates 2025
Keep a track of the International Olympiad of Science Important Dates 2025. So that students interested in participating in the olympiad can complete the registration process on time. Furthermore, SilverZone Foundation authorities have updated regarding IOS Exam Dates on the official website. Students can track important events related to the olympiad.
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IOS Important Dates 2025
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Online Registration Date
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30th August 2025
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First Date of IOS 2025
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18th November 2025
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Second Date of IOS 2025
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10th December 2025
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IOS Result 2025 Level 1
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To Be Updated Soon
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IOS Result 2025 Level 2
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To Be Updated Soon
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IOS Eligibility Criteria 2025
The International Olympiad of Science is open for all students studying in classes 1st to 12th. There are three levels of IOS.
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Level 1: Open for participation in classes for 1st to 12th grade students.
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Level 2: Students who participated in Level 1 can go for Level 2. The minimum score in IOS should be 50%. Top 1000 rankers can come in level 2.
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Level 3: IOS Level 3 is for those students who secured first rank in classes 6th to 12th.
Check: Olympiad Preperation Tips
International Olympiad Of Science Registration
Students need to complete the IOS Registration Process to participate in the olympiad.
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Go to the SilverZone official website.
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Enter the school code to access the dedicated school’s registration page.
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Fill out the application form and put the details correctly.
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Select the Olympiad category.
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Read & accept the conditions to proceed with the registration process.
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Check all details mentioned in the application form.
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Pay a $10 fee to finalise registration.
IOS Syllabus 2025
International Science Olympiad Syllabus knowledge is essential to aid in the preparation journey of students. Therefore, we provided IOS Class-Wise Syllabus 2025. Candidates participating in the olympiad can check the class-wise syllabus topics and begin with the preparation.
IOS Class 1 Syllabus
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IOS Class 1 Syllabus
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Unit
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Chapter
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No. of Question
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Marks
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Total Marks
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Living & Non-Living Things
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Living & Non-Living Things
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2
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3.5
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7
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Plants and Animals
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Plants; Animals
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5
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3.5
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17.5
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Food and Clothes
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The food we eat, the Clothes we wear
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2
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3.5
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7
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Our Environment
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Air; Water & its Resources
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2
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3.5
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7
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Our Surroundings
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Our Family & Neighbourhood Safety Rules
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2
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3.5
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7
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Human Body
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Human Body
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2
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3.5
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7
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Reasoning and Aptitude
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Reasoning and Aptitude
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5
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4
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20
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Scholar’s Zone
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Scholar’s Zone
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5
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5.5
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27.5
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Total:
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25
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100
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International Olympiad of Science Class 2 Syllabus Topics
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International Olympiad of Science Class 2 Syllabus Topics
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Unit
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Chapter
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No. of Question
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Marks
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Total Marks
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Living & Non-Living Things
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Living & Non-Living Things
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2
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3.5
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7
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Plants and Animals
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Plants; Animals
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4
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3.5
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14
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Food and Clothes
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The food we eat, the Clothes we wear
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3
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3.5
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10.5
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Our Environment
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Air; Water & its Resources
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2
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3.5
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7
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Our Surroundings
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Our Family & Neighbourhood Safety Rules
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2
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3.5
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7
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Human Body
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Human Body
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2
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3.5
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7
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Reasoning and Aptitude
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Reasoning and Aptitude
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5
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4
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20
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Scholar’s Zone
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Scholar’s Zone
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5
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5.5
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27.5
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Total:
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25
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100
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IOS Syllabus 2025 for Class 3rd
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IOS Syllabus 2025 for Class 3rd
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Unit
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Chapter
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No. of Question
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Marks
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Total Marks
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Living & Non-Living Things
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Living & Non-Living Things
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2
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3
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6
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Plants and Animals
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Plant Kingdom
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6
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3
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18
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Animal Kingdom
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Matter, Motion, and Transport
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Matter and Motion
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4
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3
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12
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Transport
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Communication and Safety Rules
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Environment and Universe
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Our Environment, Air, Water and Weather, Our Universe
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5
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3
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15
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Our Body
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Our Body
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3
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3
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9
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Reasoning and Aptitude
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Reasoning and Aptitude
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5
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3.5
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17.5
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Scholar’s Zone
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Scholar’s Zone
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5
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4.5
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22.5
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Total:
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30
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100
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IOS Syllabus Topics For Class 4th
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IOS Syllabus Topics For Class 4th
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Unit
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Chapter
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No. of Question
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Marks
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Total Marks
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Human Body
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Functioning of the Human Body
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3
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3
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9
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Rocks and Soil
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Rocks
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2
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3
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6
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Minerals and Soil
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Environment and Universe
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Our Environment
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4
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3
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12
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Universe
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Plants and Animals
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Plant Kingdom
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6
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3
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18
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Animal Kingdom
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Work, Force, and Energy
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Work, Force, and Energy
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3
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3
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9
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Matter
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Matter
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2
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3
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6
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Reasoning and Aptitude
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Reasoning and Aptitude
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5
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3.5
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27.5
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Scholar’s Zone
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Scholar’s Zone
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5
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4.5
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22.5
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Total:
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30
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100
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International Olympiad of Science Class 5th Syllabus Topics
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International Olympiad of Science Class 5th Syllabus Topics
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Unit
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Chapter
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No. of Question
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Marks
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Total Marks
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Matter
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Matter
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2
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3
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6
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Environment and Natural Calamities
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Our Environment
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4
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3
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12
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Natural Calamities
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Housing
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Plants and Animals
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Plants
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6
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3
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18
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Animals
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Light and Sound
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Light and Sound
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2
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3
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6
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Our Body and Nutrition
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Our Body and Nutrition
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3
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3
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9
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Work and Energy
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Work, Force, Energy, and Simple Machines
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3
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3
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9
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Reasoning and Aptitude
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Reasoning and Aptitude
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5
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3.5
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17.5
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Scholar’s Zone
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Scholar’s Zone
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54.5
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22.5
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Total:
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30
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100
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IOS Class 6 Syllabus Topics
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IOS Class 6 Syllabus Topics
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Unit
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Chapter
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No. of Question
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Marks
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Total Marks
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Food
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Components of Food
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2
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2.5
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5
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Materials
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Sorting Materials into Groups
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4
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2.5
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10
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Living World
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Body Movements
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6
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2.5
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15
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Getting to Know Plants
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The Living Organisms-Characteristics and Habits
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Motion and Measurement
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Motion and Measurement of Distances
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2
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2.5
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5
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How Things Works
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Electricity and Circuits
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7
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2.5
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17.5
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Fun and Magnets
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Light
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Air
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Air Around Us
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2
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2.5
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5
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Reasoning and Aptitude
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Reasoning and Aptitude
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7
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3
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21
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Scholar’s Zone
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Scholar’s Zone
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5
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4.3
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21.5
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Total:
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30
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100
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IOS Class 7th Syllabus
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IOS Class 7th Syllabus
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Unit
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Chapter
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No. of Question
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Marks
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Total Marks
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How Stuff Works
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Light
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6
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2.5
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15
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Electric Current and Its Effects
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Living World
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Respiration
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6
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2.5
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15
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Transportation in Plants and Animals
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Reproduction in Plants
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Materials
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Heat
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6
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2.5
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15
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Acids, Bases and Salts
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Physical and Chemical Changes
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Natural Resources
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Wastewater Story
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2
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2.5
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5
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Forest
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Food
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Nutrition in Plants
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3
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2.5
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7.5
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Nutrition in Animals
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Reasoning and Aptitude
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Reasoning and Aptitude
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7
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3
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21
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Scholar’s Zone
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Scholar’s Zone
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5
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4.3
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21.5
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Total:
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35
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100
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International Olympiad of Science Class 8th Syllabus
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International Olympiad of Science Class 8th Syllabus
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Unit
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Chapter
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No. of Question
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Marks
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Total Marks
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Food
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Crop Production
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4
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2.5
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10
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Microorganism
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How Stuff Works
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Force and Pressure
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8
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2.5
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20
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Friction
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Light
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Sound
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Chemical Effects of Electric Current
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Living World
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Reproduction in Animals
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6
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2.5
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15
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Reaching the Age of Adolescence
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Conservation of Plants and Animals
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Materials
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Coal and Petroleum
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3
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2.5
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7.5
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Combustion and Flame
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Natural Phenomena
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Some Natural Phenomena
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2
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2.5
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5
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Reasoning and Aptitude
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Reasoning and Aptitude
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7
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3
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21
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Scholar’s Zone
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Scholar’s Zone
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5
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4.3
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21.5
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Total:
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35
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100
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IOS Class 9 Syllabus
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IOS Class 9 Syllabus
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Unit
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Chapter
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No. of Question
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Marks
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Total Marks
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Matter
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Matter in Our Surroundings
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3
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2
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6
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Is Matter Around Us Pure
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Atoms & Molecules
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Atoms and Molecules
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5
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2
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10
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Structure of an Atom
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Living World
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Cell
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5
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2
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10
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Tissues
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Food
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Improvement in Food Resources
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2
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2
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4
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Force & Motion
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Motion
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6
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2
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12
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Force and Laws of Motion
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Work & Energy
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Work and Energy
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4
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2
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8
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Sound
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|
Reasoning and Aptitude
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Reasoning and Aptitude
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10
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3
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30
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Scholar’s Zone
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Scholar’s Zone
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5
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4
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20
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Total:
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40
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100
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International Olympiad Of Science Class 10 Syllabus
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IOS Class 10 Syllabus
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Unit
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Chapter
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No. of Question
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Marks
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Total Marks
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Chemical Elements and Their Properties
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Chemical Reactions and Equations
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8
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2
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16
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Acids, Bases and Salts
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Metals and Non-Metals
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Carbon and Its Compounds
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Life Processes
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Life Processes
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6
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2
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12
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Control and Coordination
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Reproduction
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Heredity and Evolution
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Heredity
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2
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2
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4
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Light and Electricity
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Reflection of Light
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8
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2
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16
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Refraction of Light
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Human Eye
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Electricity
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Magnetic Effect of Electric Current
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Environment
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Environment
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1
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2
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2
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Reasoning and Aptitude
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Reasoning and Aptitude
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10
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3
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30
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Scholar’s Zone
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Scholar’s Zone
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5
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4
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20
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Total:
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40
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100
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IOS Class 11th Syllabus Topics
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IOS Class 11 (PCB) Syllabus
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Subject
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Chapter
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No. of Question
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Marks
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Total Marks
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Physics
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Unit and Measurement
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10
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2.5
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25
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Kinematics
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Laws of Motion
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Work, Energy, and Power
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Motion of a System of Particles and a Rigid Body
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Gravitation
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Properties of Bulk Matter
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Thermodynamics
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Behaviour of Perfect Gases and Kinetic Theory
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Oscillations and Waves
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Chemistry
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Some Basic Concepts of Chemistry
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10
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2.5
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25
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Structure of an Atom
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Classification of Elements and Periodicity in Properties
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Chemical Bonding and Molecular Structure
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Thermodynamics
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Equilibrium
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Redox Reactions
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Organic Chemistry – Some Basic Principles and Techniques
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Hydrocarbons
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Reasoning and Aptitude
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Reasoning and Aptitude
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10
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2.5
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25
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Biology
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Diversity in the Living World
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10
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2.5
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25
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Structural Organisation in Plants and Animals
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|
Total:
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40
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100
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IOS Class 11 (PCM) Syllabus
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Subject
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Chapter
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No. of Question
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Marks
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Total Marks
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Physics
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Unit and Measurement
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10
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2.5
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25
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Kinematics
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Laws of Motion
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Work, Energy, and Power
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Motion of the System of
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Particles and Rigid Body
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Gravitation
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Properties of Bulk Matter
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Thermodynamics
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Behaviour of Perfect
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Gases and Kinetic Theory
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Oscillations and Waves
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Chemistry
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Some Basic Concepts of Chemistry
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10
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2.5
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25
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Structure of an Atom
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Classification of Elements and Periodicity in Properties
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Chemical Bonding and Molecular Structure
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Equilibrium
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|
Redox Reactions
|
|
Organic Chemistry – Some Basic Principles and Techniques
|
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Hydrocarbons
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Mathematics
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Sets and Functions
|
10
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2.5
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25
|
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Algebra
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Coordinate Geometry
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Calculus
|
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Statistics and Probability
|
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Reasoning and Aptitude
|
Reasoning and Aptitude
|
10
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2.5
|
25
|
|
Total:
|
|
40
|
|
100
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IOS Class 12th Syllabus Topics
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IOS Class 12 (PCB):
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Subject
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Chapter
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No. of Question
|
Marks
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Total Marks
|
|
Physics
|
Electrostatics
|
10
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2.5
|
25
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Current Electricity
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Magnetic Effects of Current and Magnetism
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Electromagnetic Induction and Alternating Currents
|
|
Electromagnetic Waves
|
|
Optics
|
|
Dual Nature of Matter and Radiation
|
|
Atoms and Nuclei
|
|
Electronic Devices
|
|
Chemistry
|
Solutions
|
10
|
2.5
|
25
|
|
Electrochemistry
|
|
Chemical Kinetics
|
|
The d and f Block Elements
|
|
Coordination Compounds
|
|
Organic Compounds Containing Halogens (Haloalkanes and Haloarenes)
|
|
Organic Compounds Containing Oxygen (Alcohols, Phenols, Ethers, Aldehydes, Ketones and Carboxylic Acids)
|
|
Organic Compounds Containing Nitrogen (Amines)
|
|
Biomolecules
|
|
Reasoning and Aptitude
|
Reasoning and Aptitude
|
10
|
2.5
|
25
|
|
Biology
|
Reproduction
|
10
|
2.5
|
25
|
|
Genetics and Evolution
|
|
Biology and Human Welfare
|
|
Biotechnology
|
|
Ecology
|
|
Total:
|
|
40
|
|
100
|
|
IOS Class 12 (PCM)
|
|
Subject
|
Chapter
|
No. of Question
|
Marks
|
Total Marks
|
|
Physics
|
Electrostatics
|
10
|
2.5
|
25
|
|
Current Electricity
|
|
Magnetic Effects of Current and Magnetism
|
|
Electromagnetic Induction and Alternating Currents
|
|
Electromagnetic Waves
|
|
Optics
|
|
Dual Nature of Matter and Radiation
|
|
Atoms and Nuclei
|
|
Electronic Devices
|
|
Chemistry
|
Solutions
|
10
|
2.5
|
25
|
|
Electrochemistry
|
|
Chemical Kinetics
|
|
The d and f Block Elements
|
|
Coordination Compounds
|
|
Organic Compounds Containing Halogens (Haloalkanes and Haloarenes)
|
|
Organic Compounds Containing Oxygen (Alcohols, Phenols, Ethers, Aldehydes, Ketones and Carboxylic Acids)
|
|
Organic Compounds Containing Nitrogen (Amines)
|
|
Biomolecules
|
|
Mathematics
|
Relation and Function
|
10
|
2.5
|
25
|
|
Algebra
|
|
Calculus
|
|
Vectors and Three-Dimensional Geometry
|
|
Linear Programming
|
|
Probability
|
|
Reasoning and Aptitude
|
Reasoning and Aptitude
|
10
|
2.5
|
25
|
|
Total:
|
|
40
|
|
|
IOS Exam Pattern 2025
Students should know that questions asked in IOS are in the English language only. The question pattern is multiple-choice questions from science-related topics. No penalties for wrong attempts in the olympiad.
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IOS Exam Pattern 2025
|
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Classes
|
Total Questions
|
Time
|
|
Classes 1-2
|
25 questions
|
40 minutes
|
|
Classes 3-5
|
30 questions
|
40 minutes
|
|
Classes 6-8
|
35 questions
|
40 minutes
|
|
Classes 9-12
|
40 questions
|
45 minutes
|
IOS Awards & Recognition 2025
Top performing students in the International Olympiad of Science get awards and recognition from the authorities. It is to appreciate their performance in attempting questions and securing ra ank in olympiad.
IOS 2025 Level 3 Rewards
The top 2 performing students in Maths and Science get an opportunity to visit NASA in the USA.
IOS 2025 Level 2 Rewards
Rank Holders in the International Olympiad of Science Level 2 get a cash prize.
|
IOS 2025 Level 2 Rewards
|
|
Ranks
|
Rewards & Recognition
|
|
Rank 1
|
1 Olympiad rank Holder get a cash prize
|
|
Class 12:- Rs. 50,000
|
|
Class 11:- Rs. 25,000
|
|
Class 1 to 10:- Rs. 10,000
|
|
Rank 2
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2 Olympiad Rank Holders are awarded a cash prize
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Class 11 & 12: Rs. 10,000
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Class 1 to 10: Rs. 7,500
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Rank 3
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3 Olympiad Rank Holders get a cash prize
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Class 11 & 12: Rs. 7,500
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Class 1 to 10: Rs. 5,000
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IOS 2025 Level 1 Rewards
Rankholders in IOS Level 1 get cash prizes, medals, and certificates. The awards and recognitions are provided to the students depending on the rank secured in the olympiad.
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IOS 2025 Level 1 Rewards
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Ranks
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Rewards
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Rank 1 to 3
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Zonal & State Rank holders from classes 1st to 12th get medals.
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Rank 4 to 10
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Rank holders from class 1st to 12th get gift certificates.
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Rank 11 to 25
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Rank holders get gift certificates.
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Rank 26 to 500
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Topper Achievement Certificate
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1st, 2nd 3rd Class Topper
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1st, 2nd 3rd get Medals of Excellence.
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All
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Participation Certification
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