Three of these numbers are alike. Which one is the odd one out?
🔬 Science · Class 1
SOF ISO Class 1: syllabus, paper pattern and sample questions
The SOF International Science Olympiad (formerly NSO) for Class 1 is a 60-minute paper of 35 questions for 40 marks in 3 sections. Every question has four options and one right answer. The last 5 questions are the Achievers Section, worth 2 marks each. Below: how the paper is set out, the 8 chapters it draws on, one sample question from each section with its answer, and how to practise it for free.
Paper pattern
ISO Class 1 is set out in 3 sections. Sprinto's mock tests and printed papers follow the same order, counts and marks.
| Section | Questions | Marks each | Marks |
|---|---|---|---|
| 1.Logical Reasoning | 5 | 1 | 5 |
| 2.Science | 25 | 1 | 25 |
| 3.Achievers Sectionhardest | 5 | 2 | 10 |
| Total · 60 minutes | 35 | 40 |
Syllabus: the 8 chapters
Every question on the paper belongs to one of these chapters. On Sprinto's map each chapter is an island, and the Achievers Section is the same chapters asked harder — not a separate topic.
- 1.Living and Non-living ThingsSections 2 and 3 · "Living Lagoon" on the map
- 2.PlantsSections 2 and 3 · "Green Grove" on the map
- 3.AnimalsSections 2 and 3 · "Animal Ark" on the map
- 4.Human Beings and Their NeedsSections 2 and 3 · "Home Cove" on the map
- 5.Good Habits and Safety RulesSections 2 and 3 · "Healthy Harbour" on the map
- 6.Air and WaterSections 2 and 3 · "Splash Point" on the map
- 7.Weather and the SkySections 2 and 3 · "Star Summit" on the map
- 8.Logical ReasoningSection 1 · "Puzzle Peak" on the map
Sample questions with answers
One from each section, taken from Sprinto's own bank for ISO Class 1. In the app the numbers, names and figures are different every time; these are fixed so you can read them.
Sample 1 · Section 1: Logical Reasoning · Logical Reasoning
Answer: (D) 57
67, 64, 65 all have 6 in the tens place. 57 has 5 there, so it is the odd one out.
Sample 2 · Section 2: Science · Animals
The body of a fish is covered with
Answer: (C) scales
A fish has scales on its body.
Sample 3 · Section 3: Achievers Section · Air and Water · Achievers difficulty
Match each source of water with what it does.
(i) A hand pump
(ii) Rain
(iii) A river
P is pushed up and down to draw water up
Q flows across the land to the sea
R falls on us from the clouds
Answer: (D) (i) – P, (ii) – R, (iii) – Q
A hand pump is pushed up and down to draw water up. Rain falls on us from the clouds. A river flows across the land to the sea.
How to practise ISO Class 1 on Sprinto
- One island per chapter. A hidden rating per chapter picks the next science question at the difficulty that is just hard enough today.
- Mistakes come back. Anything she gets wrong returns a few days later, then a week, then a month, until it stops being a mistake.
- Mock tests in the real shape. 35 questions, 3 sections, 60 minutes, marked the moment she hands it in.
- Papers you can print. A full ISO Class 1 paper with an OMR sheet, sat at the table with a pencil.
Free, with no ads and nothing to buy. A parent signs in with Google once; the child taps her face and starts.
Start practising