Question 1 of 35
What comes next in this pattern?
34, 42, 50, 58, ___
🔬 Science · Class 3 · 2026-27
SOF ISO Class 3 free mock test and sample paper
A full ISO Class 3 practice paper: 35 questions for 40 marks in 60 minutes, in the same 3 sections and order as the SOF paper. Take it here with an instant score — no login, no sign-up — or print it with an OMR sheet and the answer key. Free, with no ads.
- Questions35
- Marks40
- Time60 min
- Sections3
The paper
Tap an answer for each question. The 60-minute clock starts at your first answer; press Finish and mark at the bottom when you are done, and every answer is explained.
Section 1 — Logical Reasoning · 5 × 1 mark
- Question 2 of 35
7 : 28 :: 8 : ?
- Question 3 of 35
The first two figures go together in a certain way. Complete the second pair in the same way.
?A : B :: C : ? - Question 4 of 35
Which option is the mirror image of the given figure when a mirror is held along its right side?
- Question 5 of 35
Which figure does not belong with the other three?
Section 2 — Science · 25 × 1 mark
- Question 6 of 35
Which of these gives out its own light?
- Question 7 of 35
Fruits and vegetables should be washed before we eat them because ____.
- Question 8 of 35
To which food group does fish belong?
- Question 9 of 35
Which kind of house would you expect to find in towns, with a garden around it?
- Question 10 of 35
When we eat radish, which part of the plant are we eating?
- Question 11 of 35
What happens to light when it falls on a mirror?
- Question 12 of 35
A push or a pull is called a ____.
- Question 13 of 35
Which bird builds its nest by this method — it keeps its egg on its feet in the cold?
- Question 14 of 35
What is a baby fish called?
- Question 15 of 35
Which cloth is the best one to wear in winter?
- Question 16 of 35
Which part of the body do we use to hear?
- Question 17 of 35
Which animal makes its home in the forest?
- Question 18 of 35
Which organ of the body does this work — gives the body its shape and protects the soft parts inside?
- Question 19 of 35
What is the shape of a gulmohar leaf?
- Question 20 of 35
Which phase of the Moon is shown in the picture?
- Question 21 of 35
Which joint lets your shoulder move round in every direction?
- Question 22 of 35
Which of these foods belongs to the same group as the foods shown in the picture?
- Question 23 of 35
Which kind of pollution is caused by rubbish and plastic dumped on the ground?
- Question 24 of 35
Which of these is made by people?
- Question 25 of 35
Which teeth tear the food?
- Question 26 of 35
Which of these is a gas?
- Question 27 of 35
Where do we get nylon from?
- Question 28 of 35
Birds have hollow bones. Why is that useful?
- Question 29 of 35
The place where a plant or animal naturally lives is called its ____.
- Question 30 of 35
Which of these is not a safe thing to do?
Section 3 — Achievers Section · 5 × 2 marks
- Question 31 of 35
Read the statements about the sparrow given below.
(i) It eats grains.
(ii) It has thin perching feet.
(iii) It has a sharp hooked beak.
Which of these is/are correct?
- Question 32 of 35
Read the statements about the heavenly body Earth given below.
(i) Earth is the third planet from the Sun.
(ii) Earth makes its own light, just as the Sun does.
(iii) Earth is the only planet known to have life on it.
Which of these is/are correct?
- Question 33 of 35
Look at the pattern:
3, 10, 17, 24, ...
What is the 13th number in this pattern?
- Question 34 of 35
Match each organ in Column I with the work it does in Column II.
Column I
(a) Stomach
(b) Brain
(c) Lungs
(d) Skeleton
Column II
(1) Take in air so the body gets oxygen
(2) Gives the body its shape and protects the soft parts inside
(3) Thinks, remembers and controls the whole body
(4) Churns the food we swallow and starts to digest it
- Question 35 of 35
Read the statements about food given below.
(i) We get butter from a plant.
(ii) We get wheat from an animal.
(iii) Potato is an energy-giving food.
Which of these is/are correct?
Answer key and explanations (opens below)
1. (C) 2. (A) 3. (A) 4. (C) 5. (C) 6. (D) 7. (D) 8. (D) 9. (D) 10. (A) 11. (A) 12. (A) 13. (D) 14. (A) 15. (D) 16. (C) 17. (C) 18. (A) 19. (B) 20. (C) 21. (C) 22. (A) 23. (C) 24. (B) 25. (D) 26. (C) 27. (D) 28. (B) 29. (A) 30. (D) 31. (B) 32. (C) 33. (D) 34. (A) 35. (B)
- 1. (C)
Each number is 8 more than the one before, so after 58 comes 58 + 8 = 66.
- 2. (A)
28 is 7 multiplied by 4, so the second pair follows the same rule: 8 × 4 = 32.
- 3. (A)
The second figure is the first one flipped left to right, so the fourth is the third flipped the same way.
- 4. (C)
A mirror at the side swaps left and right but leaves top and bottom the same way up.
- 5. (C)
Three of the figures have 4 sides. The hexagon has 6, so it is the odd one.
- 6. (D)
A burning candle makes its own light. The other three can only send back light that has fallen on them.
- 7. (D)
They travel a long way from the field to the plate and pick up dust, soil and germs on the way.
- 8. (D)
Fish is a body-building food, because it helps the body grow and mends what is worn out.
- 9. (D)
A bungalow is built in towns, with a garden around it, out of bricks and cement.
- 10. (A)
We eat the root of the radish plant.
- 11. (A)
A mirror is smooth and shiny, so light bounces off it — and that bounced light is the picture you see.
- 12. (A)
Every force is one of the two: you either push a thing away from you or pull it towards you.
- 13. (D)
The penguin keeps its egg on its feet in the cold.
- 14. (A)
A baby fish is called a fry.
- 15. (D)
Wool is worn in winter because it traps warm air close to the body.
- 16. (C)
We hear with our ears — that is the sense of hearing.
- 17. (C)
A monkey lives in the forest: long arms and a strong tail help it swing from branches.
- 18. (A)
The skeleton: gives the body its shape and protects the soft parts inside. That is the skeletal system at work.
- 19. (B)
A gulmohar leaf is feather-like.
- 20. (C)
In a new moon, the Moon cannot be seen at all.
- 21. (C)
The round end of the arm bone sits in a cup, so it can turn any way — which is why you can swing your arm in a circle.
- 22. (A)
Everything in the picture is a protective food — it keeps us from falling ill. So is spinach.
- 23. (C)
That is land pollution: the soil is spoiled and plants do not grow well.
- 24. (B)
A school building is built by people. The other three are there without anyone making them.
- 25. (D)
The canines sit just beside the front teeth, pointed and sharp — their job is to tear the food.
- 26. (C)
Oxygen is a gas: it has no shape of its own and has no definite volume — it fills the whole container.
- 27. (D)
Nylon comes from a factory, not a plant or animal.
- 28. (B)
A hollow bone is strong but weighs very little, so a bird carries less weight into the air.
- 29. (A)
A habitat gives an animal the food, water and shelter it needs, which is why it lives there and not elsewhere.
- 30. (D)
Lighting a matchstick near a gas cylinder that is leaking is dangerous. The other three are safety rules worth following every day.
- 31. (B)
(i) is correct. (ii) is correct. (iii) is wrong. So both (i) and (ii) are right.
- 32. (C)
(i) is correct. (ii) is wrong. (iii) is correct. So both (i) and (iii) are right.
- 33. (D)
The pattern starts at 3 and goes up by 7 each time. To reach the 13th number it takes 12 steps: 3 + 12 × 7 = 87.
- 34. (A)
the stomach churns the food we swallow and starts to digest it; the brain thinks, remembers and controls the whole body; the lungs take in air so the body gets oxygen; the skeleton gives the body its shape and protects the soft parts inside.
- 35. (B)
(i) is wrong. (ii) is wrong. (iii) is correct. So (iii) only is right.
About this mock test
- Is this ISO Class 3 mock test really free, with no login?
- Yes. The whole paper is on this page: no account, no sign-up, no phone number and no ads. Nothing your child answers here is sent anywhere or stored.
- How is it marked?
- The same way as the SOF paper: Logical Reasoning 1 mark a question, Science 1 mark a question, Achievers Section 2 marks a question, 40 marks in all. Press Finish and mark to see the score by section and the right answer, with an explanation, under every question.
- Can I print it?
- Yes. Print paper + OMR sheet lays it out like the real paper, with a bubble sheet and the answer key on its own last page so it can be set aside. Choose Save as PDF in the print dialog to keep a copy.
- Is it the same as the real ISO paper?
- It has the real paper's shape — 35 questions, the same sections in the same order, the same marks and the same 60 minutes — and its questions come from the ISO Class 3 syllabus. The questions are Sprinto's own, not SOF's; Sprinto is not affiliated with the Science Olympiad Foundation.
Fresh questions every time
This paper stays the same so it can be printed and shared. In the app every ISO Class 3 question is new, the next one is picked to be just hard enough, and mistakes come back until they stick. Still free.